JPH09151472A - Construction method for propelling sunken shaft also used as manhole, sinking control device and sunken block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of eliminating a conventional defect and executing a work in a short term as well as economically, and further provide a sinking control device capable of ensuring a safe work as well as a sunken block of light weight and low cost allowing an easy handling work. SOLUTION: Upper and lower brackets separable from each other are provided on the second bottom 10 of an excavated hole, and a simplified steel sheet pile is driven, using the external surface of the brackets as a guide. Thereafter, anchor bolts are buried outside the steel sheet pile and concrete 40 is placed. After the concrete 40 is cured, both brackets and the simplified steel sheet pile are removed and a cutting edge B0 is installed on the second bottom 10. A sunken block B1 divisionally made for the bottom and an upper stage sunken block B2 divided into the prescribed number of stages are placed at each position above the cutting edge B0. Then, a centering device and a sinking control device 130 with an excessive sink prevention function are fixed to the anchor bolts, and a slow-hardening anti-friction composition is pressed into an introduction pipe, with the inclination, the travel amount or the like of the centering device and the sinking control device 130 confirmed from an initial sinking stage, thereby excavating and discharging internal sediment and sinking a shaft.

Description

Detailed Description of the Invention

[0001]

[Industrial application field] Recent urban sewer maintenance, power supply,
Due to the development of communication networks and the like, the propulsion method for small-diameter pipes using manholes and vertical shafts for propulsion is widely used. The present invention, when constructing a manhole and propulsion shaft, reduces the occupied width of the planned construction site (road) as much as possible to reduce traffic obstacles and noise level during construction, and also enables a short-term economical construction. The construction method of the sinking establishment mine for propulsion, the sinking control device that prevents the risk of oversubsidence during the sinking work and the increase in costs due to the failure of the work to smooth the work, and the sinking block that is easy to handle and can be economically constructed. provide.

[0002]

2. Description of the Related Art An excavation hole having a predetermined depth is provided at a planned site, and a liner plate for mountain stopper is connected from the inside of the excavation hole to the required depth in a cylindrical shape in the bottom direction and assembled manually, and the inside of the liner plate is then assembled. The bottom block of the cylindrical cross section by centrifugal force forming with a blade on the bottom of the excavation hole is hung, the earth and sand on the inner surface of the bottom block are excavated, and the upper sunk blocks of the same shape are placed and connected in sequence. A slab block with an opening is installed on the upper surface of the submerged block, and a manhole is placed on the slab block and the space on the slab block is backfilled to construct a manhole and propulsion shaft.

However, the conventional bottom block having a cylindrical cross section formed by centrifugal force is heavy, and it is difficult for a large truck to enter and transport to a narrow area. A large crane is required for the construction, and the groundwater level in the excavation hole is high. If it is high, it is not possible to assemble the liner plate to the required depth, and there is a risk of unexpected oversubsidence during deposition, and the construction period and construction cost increase due to difficult-to-correct tilts and movements, etc. The construction method of the manhole and propulsion vertical shaft that prevents the danger of oversubsidence and can perform the sedimentation work smoothly, and enables the short-term and economical construction, and the sedimentation control device that smoothly supports this construction method. There has been a demand for a submerged block that can reduce the total cost.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
To provide a construction method for a manhole / promotion sinking pit that can be constructed in a short-term and economical manner, a sinking control device that is safe to work, and a sinking block that is lightweight and easy to handle.

[0005]

In order to eliminate the drawbacks of the prior art, in the first step of claim 1, the second bottom surface 10 of the excavation hole 15 provided with the first bottom surface 5 and the second bottom surface 10 in a stepwise manner is provided. The upper receiving frame 20 and the lower receiving frame 22, which are vertically detachable and separated from each other by a predetermined distance, are placed horizontally, and the upper receiving frame 20 and the lower receiving frame 2 are placed.
Using the outer peripheral surface of 2 as a guide, a simple steel sheet pile 30 is driven to the required depth and laid around, and concrete 40 is placed in the space outside the simple steel sheet pile 30 and a predetermined number of anchor bolts 25 are projected into the concrete 40. Set up.

In the second step, after the concrete 40 is hardened, the upper receiving frame 20 and the lower receiving frame 22 are removed, the simple steel sheet pile 30 is removed, and the integrally formed blade mouth portion B0 is horizontally placed at a predetermined position on the second bottom surface 10. Installed in the upper part of the blade opening B0, and vertically sunk a submerged block B1a having an arbitrary cross-sectional shape which is vertically divided and connectable, and then similarly divided vertically to produce an arbitrary cross-sectional shape. Block B for the bottom of the
Submerged block B1 in which 1b is suspended and connected to be integrated
Is connected to the blade opening B0, a centering device 50 is interposed between the outer circumference of the submerged block B1 and the anchor bolt 25, and the submerged blocks B2a and B2b in the upper stage manufactured by dividing the submerged block B1 in the same manner as above are The sunk block B2, which was hung and connected and integrated, was connected to the sunk block B1, the earth and sand inside were excavated and discharged, and when the blade opening B0 was inserted into the ground, it was inserted from the surface to the upper portion of the blade opening B0. While slowly feeding the slow-hardening antifriction material D through the conduit P1, excavating and excavating the earth further to settle the submerged block B2 to a position where a predetermined dimension is exposed on the first bottom surface 5, and if necessary, the submerged block of the required number of steps is the same as above. It is connected, excavated and excavated from the inside, and settled down to a position where a predetermined dimension is exposed on the first bottom surface 5.

Further, in the third step, the sedimentation control device 130
Of the reaction force receiving base portion 110 is fixed to the anchor bolt 25, a guide rail 115 having a required length is vertically provided on a standing leg portion 109 of the reaction force receiving base portion 110, and a bracket 116 which is slidable and detachable on the guide rail 115. Is locked at a predetermined position of the locking hole 104 of the guide rail 115, and the pressing cylinder 120 is vertically provided at the connecting portion 117 of the bracket 116 so that the upper surface BT of the upper block can be pressed, and the uppermost submerged block is The connected screw rod 86 for preventing excessive subsidence is loosely inserted into the screw rod insertion hole 96 of the bracket 116, and the stop nut 87 is screwed into a predetermined position above the screw rod 86 protruding from the screw rod insertion hole 96, and a predetermined amount from the conduit P1. While the slow-hardening antifriction material D is pressed into the gap G between the ground and the set block, the pressure cylinder 120 is operated by fluid pressure to adjust the stop nut 87 to control the sedimentation. Part of the bottom surface of the earth and sand excavated earth removal is precipitated-grounding to a predetermined depth.

In the fourth step, after the flocculant is added to the bottom slime, water and the separated agglomerates are removed, and then the cement-based solidifying agent is added. After the bottom-filled concrete C is hardened, it is drained, the settling control device 130, the excessive subsidence preventing screw 86 and the centering means 50 are removed, and the residual void G is filled with the slow-hardening antifriction material D.

The propulsion process of the pipe (propulsion pipe) is performed from the propulsion pipe starting pit opening inside the submerged block B1 for the bottom,

In the fifth step after completion of the propulsion process of the pipe (propulsion pipe), an intermediate floor slab block F having an opening eccentrically provided above the submerged block is placed and connected, and the intermediate floor slab block F is connected.
A known manhole M is placed on the upper part of the excavation hole 10 to construct a manhole / promotion settling pit for backfilling the space of the excavation hole 10.

Further, in claim 2, the construction is made by using the bottom submerged block and the upper submerged block integrated outside (outside the drilling hole or in the manufacturing plant). The construction method of the manhole and propulsion shaft is constructed.

Further, in claim 3, in the third step,
The screw rod 86 for preventing over-subsidence which has been inserted through the bracket 116 of the settling control device 130 is inserted into the over-submergence preventing base portion 97 fixed to the anchor bolt 25, and the screw rod insertion hole 96 is formed.
And the stop nut 87 is screwed into a predetermined position of the screw rod 86 protruding upward from the screw rod insertion hole 96 by screwing the screw rod 86 into the screw rod connecting portion 56 of the connecting fitting 57 connecting the screw rod 86 to the uppermost submerged block. The construction method for a manhole / propulsion vertical shaft according to claim 1, wherein the oversubsidence prevention device 90 is replaced.

Further, in claim 4, in the second to fourth steps, when it is difficult to visually recognize the excavated state of the bottom due to spring water,
A conduit P2 provided by connecting a horizontal portion ph having a required length, which displays a depth scale m and has a plurality of pores N at the lower end, in an inverted T shape.
Is inserted into the inside of the blade opening portion B0 that is difficult to visually recognize, and compressed air is fed under pressure to collapse the earth and sand inside the blade opening portion B0 and discharge the soil. It constitutes the construction method of the described manhole and propulsion shaft.

Further, in claim 5, the sedimentation control device 130.
However, the reaction force receiving member 110 having the standing leg portion 109 is fixed to the anchor bolt 25, and the guide rail 115 having the plurality of locking holes 104 provided at predetermined positions in the longitudinal direction of the standing leg portion 109.
A bracket 116 slidably provided on the guide rail 115 and engageable with the engagement hole 104, one end is connected to the lower surface of the bracket 116, and a pressing portion 119 is provided on the other end. The pressing cylinder 120 is provided, and the screw rod 86 connected to the sinking block for preventing excessive subsidence is loosely inserted into the screw rod insertion hole 96 of the bracket 116, and the stop nut 87 is screwed onto the upper portion of the required position. It constitutes the control device.

Further, in claim 6, the sedimentation control device 130.
The guide rail 115 is provided with a rack-shaped meshing portion 114, a bracket 116B slidably engaged with the guide rail 115 is provided, and a ratchet 122 which is idle only in the bracket 116B when descending is provided by a spring SP. The sedimentation control device according to claim 4, wherein the meshing portion 114 is always biased to be meshed.

According to a seventh aspect of the present invention, there is provided an arbitrary tubular blade opening portion B0 having a triangular cross section and formed of a steel plate and filled with concrete, and a packing pa is provided around the blade opening portion.
At the inside of the packing pa, a propulsion pipe starting (arriving) wellhead H is simultaneously formed at the time of driving, is manufactured by dividing it vertically, and is then integrally joined and fixed to the bottom submerged block B1 which is vertically connectable, Similarly to the bottom submerged block B1, the vertical subdivided connecting portions are alternately arranged in the vertical subdivided connecting portions after the vertical subdivided connecting portions are manufactured by vertically dividing and manufacturing and then integrally connecting them and vertically connecting them. The intermediate block slab F is mounted and sealed as described above, and the intermediate floor slab block F having an opening eccentrically provided on the uppermost sunk block B2 is mounted and sealed.

[0017]

The operation of the construction method of the manhole / propulsion shaft according to the present invention will be described below with reference to FIGS. In the first step according to claim 1 shown in FIG. 1, the upper receiving frame 20 and the lower receiving frame 2 that can be separated into the horizontal second bottom surface 10 of the excavation hole 15 are provided.
2 is installed and the outer peripheral surfaces of both receiving frames 20 and 22 are used as guides, so that the simple steel sheet pile 30 can be easily vertically driven in a short time, and the ground beneath the second bottom surface 10 temporarily becomes independent. When it is difficult, the mountain can be stopped easily even when the groundwater level is high, and the concrete 40 that has been placed on the outside of the simple steel sheet pile 30 is fixed to the ground and is firmly embedded in the anchor bolt 25 that is used in the subsequent process. It is possible to create the required space required for subsidence work at an appropriate position without damaging private land or housing.

In the initial stage of the second step according to claim 1 shown in FIG. 2, after the concrete 40 hardens, the upper receiving frame 20 and the lower receiving frame 22 are separated and removed, respectively, and the simple steel sheet pile 30 is removed. It is easy to install the blade part BO at a predetermined position on the second bottom surface 10 provided horizontally, and the divided sink blocks B1a and B1b are lightweight and easy to handle, and can be easily placed by a small crane. Therefore, it can be easily integrated by a cotter jc or a bolt connection (not shown), and can also be easily connected from the inner surface with the blade opening B0. Further, since the centering device 50 or the centering spacer 50B (shown in the upper left of FIG. 3 and FIG. 3) is provided between the anchor bolt 25 and the submerged block B1 in this step, the subsequent steps can be performed smoothly.

FIG. 3 is a perspective view of the centering device. As shown in the upper right of the drawing, the centering device is arranged so as to come into contact with the outer periphery of the submerged block B (indicated by the arrow 50). Roller 53 at the tip of movable member 52
Alternatively, the spacer 58 of the centering spacer 50B can be easily corrected while visually checking the inclination, the amount of movement, etc. from the initial stage of sedimentation while maintaining the proper position and supporting or slidingly contacting.

In the latter half of the second step according to claim 1 shown in FIG. 4, the submerged block B2 having the required number of steps is placed, and the excavation and the subsidence are repeated, so that the submerged block having the required number of steps is moved to the centering device 50 and the centering spacer. It is possible to settle at a predetermined position while visually observing and correcting the amount of inclination, the amount of movement, etc. by 50B or the like.

In the third and fourth steps according to claim 1 shown in FIG. 5, the screw rod 86 of the sinking control device 130 is attached to the screw rod connecting portion 56 of the connecting fitting 57 of the uppermost submerged block.
Since the screw rod 86 is inserted into the bracket 116 and the stop nut 87 is screwed to the upper position within the allowable range of excessive subsidence, the unexpected excessive subsidence can be kept within the allowable range. It is possible to prevent the failure of construction and the danger to the worker, which makes it difficult and expensive to re-raise the crane and repair the excessive inclination.

Also, in the fourth step, unlike the previous step, careful excavation is required due to the fact that the sedimentation approaches the final stage and the peripheral friction of the sedimentation block and the reaction force of the blade opening B0 increase.
This can be easily performed while controlling the load applied by the pressing of the plurality of pressing cylinders 120 connected to the guide rails of the sedimentation control device 130 via the brackets 116, and by adjusting the screwing position of the stop nut 87 for preventing the excessive subsidence. The predetermined settling can be performed while checking the depth scale m of the screw rod 86.

In the fifth step, the bottom sand disturbed by the excavation is treated with the cement-based solidifying material ck and then the bottom-filled concrete C is placed, and the slow-hardening antifriction material D hardens over time. Since it is settled in the ground, a stable supporting force is given to the vertical shaft (sink block) that has bottomed out, and it is possible to sufficiently withstand the reaction force of the propulsion machine when the propulsion pipe S is laid.

Next, if the fifth step according to claim 1 shown in FIG. 6 is completed, a stable manhole / propulsion shaft can be constructed in a short time, the width of the road occupied at the construction site is small, and the total cost is reduced. be able to.

In the second step (not shown) according to claim 2, the construction is performed by using the bottom submerged block and the upper submerged block integrated outside (outside the drilling hole or in the manufacturing plant). The time can be further shortened.

An oversubsidence prevention device 90 according to a third aspect shown in FIG. 7 is the oversubsidence prevention screw rod 86 inserted into the bracket 116 of the sedimentation control device 130 in the third step according to the first aspect. , A screw rod insertion hole 96 formed in an over-subsidence prevention base portion 97 fixed to a separately provided anchor bolt 25
And a stop nut 87 is screwed into the upper portion of the allowable range of excessive subsidence, and the screw rod 86 is screwed into the screw rod connecting portion 56 of the connecting metal fitting 57 that is connected to the uppermost submerged block to project upward from the screw rod insertion hole 96. Since the stop nut 87 is screwed into the required position of the screw rod 86, the adjustment of the stop nut 87 can prevent the excessive subsidence like the one provided in the sedimentation control device 130.

Further, in the embodiment shown in FIG. 8, in the second to fourth steps of the construction method, when it is difficult to visually recognize the excavated state of the bottom due to spring water, the conduit P2 displaying the depth scale m is displayed.
A horizontal portion ph having a required length in which a plurality of fine holes N are formed at the lower end of the
Since it is provided in an inverted T shape, if compressed air is sent to the conduit P2, the sediment inside the blade portion B0 will be collapsed (the blade edge will be dropped) while confirming the settling depth with a depth scale and tactile sensation.
It can be done easily in a short time, it can prevent excessive deep digging that disturbs the support ground, and it is a cheaper sunk block than a sunk block with a fluid pipe line installed inside the blade mouth to drop the blade mouth. Can be used.

Further, in the sedimentation control device according to a fifth aspect shown in FIG. 9, the reaction force receiving member 11 fixed to the anchor bolt 25 is provided.
Since 0 can absorb the reaction force by the pressing cylinder 120 and the load at the time of preventing the excessive subsidence, the failure of construction due to excessive inclination, excessive subsidence, etc., and the danger to the worker can be prevented in advance, and the large crane can be corrected. It is possible to avoid complicated work such as pulling up again due to.

Further, in the sedimentation control device according to the sixth aspect shown in FIG. 10, since the bracket 116B automatically descends by the retracting stroke when the pressing cylinder retracts, it is not necessary to change the mounting position of the bracket 116B each time. ,
Labor saving and time saving can be achieved.

Further, if the submerged block shown in FIG. 11 is applied, the starting hole H for propulsion can be formed at the same time at the required position (the conventional one is inexpensive after the manufacturing). Since it is lightweight due to the division, it can be easily carried into a narrow space, can be constructed with a small crane, and noise pollution can be reduced, and since the bottom sunk block B1 has a flat inner surface, the reaction force of the propulsion machine is evenly received. This is also advantageous in terms of strength.

By applying the construction method of the manhole / promotion settling pit, the sedimentation control device and the sunk block as described above, the road occupation width, noise pollution, total cost, etc. can be reduced when constructing the manhole / promotion settling pit. Can be reduced.

[0032]

1 to 11 show an embodiment of the present invention. FIG. 1 shows a first construction method according to claim 1 of the present invention.
4 is a perspective view showing the steps, FIG. 2 is a perspective view showing an initial stage of the second step of the construction method according to claim 1 of the present invention, and FIG. 3 is a perspective view of the centering device according to claim 1 of the present invention. Is a perspective view showing a second step of the construction method according to claim 1 of the present invention, and FIG. 5 is a third view of the construction method according to claim 1 of the present invention.
6 is a perspective view showing a fourth step, FIG. 6 is a sectional view showing a fifth step of the construction method according to claim 1 of the present invention, and FIG. 7 is a perspective view of an oversubsidence prevention device according to claim 3 of the present invention. 8 is a sectional view showing an embodiment according to claim 4 of the present invention, FIG. 9 is an exploded perspective view of a sedimentation control device according to claim 5 of the present invention, FIG.
FIG. 11 is an exploded perspective view of a main part of a sedimentation control device according to claim 6 of the present invention, and FIG. 11 is a perspective view of a deposition block according to claim 7 of the present invention.

An embodiment of a method for constructing a manhole / propulsion settling pit according to claim 1 will be described below in order of each step with reference to FIGS. 1 to 6.

FIG. 1 is a perspective view showing a first step of the construction method of the present invention. A shallow step-like first bottom surface 5 (on which a lining plate is installed for passage after the construction is completed) at the construction site. ) And a deep second bottom surface 10 (which serves as a reference surface for constructing a vertical shaft) are horizontally drilled to provide a drilling hole 15 having a predetermined depth, and are configured to have a predetermined dimension with square steel pipes, other steel materials, resin-impregnated wood, etc. Upper receiving frame 2
0 and the lower receiving frame 22 are separated from each other by a predetermined distance and screwed so as to be separable and placed on the second bottom surface 10. The outer peripheral surfaces of the upper receiving frame 20 and the lower receiving frame 22 are used as guides to abut and strike the simple steel sheet pile 30. Then, concrete 40 is placed in the space outside the simple steel sheet pile 30, and at the same time, the required number of anchor bolts 25 used for centering, sedimentation control, oversubsidence prevention, etc. in the subsequent steps are buried, and the first step is completed. To do.

FIG. 2 is a perspective view showing the initial stage of the second step of the construction method of the present invention, in which the concrete 40 poured in the previous step is used.
After hardening, the upper receiving frame 20 and the lower receiving frame 22 are disassembled and removed, and the simple steel sheet pile 30 is also removed to obtain a working space having the same dimensions as both the receiving frames 20 and 22. Next, the blade portion B0 is hung at a predetermined position on the bottom surface 10, and one of the bottom submerged blocks B1a manufactured by dividing the blade portion B0 is hung, and then the other bottom portion The submerged block B1b is hung, and both blocks B1a and B1b are joined and integrated to connect B1 and the blade opening B0. Next, a submerged block B2 manufactured by dividing the upper block on the submerged block B1.
b, and then the other submerged block B2a
After connecting the two blocks B2b and B2a to each other and connecting the integrated block B2 and the bottom sinking block B1 to each other, a centering device 50 (see FIG. 3) described below is attached to the anchor on the first bottom surface 5. Set in bolt 25.
At the time of hoisting, the connecting fitting 5 shown in cross section in the upper right of FIG.
In order to prevent the bending of No. 7, it is preferable to wear a guard fitting 57g or a square member 57w (under the shackle) on the back side.

FIG. 3 is a perspective view of the centering device according to claim 1 of the present invention, in which the amount of movement, the amount of inclination, etc. of the centering device from the initial stage of the sinking operation of the second step is brought into contact with the outer circumference of the sinking blocks B1, B2. In order to confirm and correct it to the proper position, it is fixed to the anchor bolt 25 of the first bottom surface 5 so as to be movable back and forth. The centering device 50 has a fixing plate 51 provided with an insertion hole into which the anchor bolt 25 can be loosely inserted, a guide 51g provided on the upper part, and a push bolt 51b screwed on the rear part. A guide plate 54 is slidably fitted in the guide 51b so as to be movable back and forth, and a pressing plate 54 is superposed on the upper portion and fixed to the anchor bolt 25. Further, a movable member 55 having a spacer 58 shown in the lower part of the drawing in place of the movable member 52 is provided.
The centering device may be provided for centering. By mounting the centering device, the subsequent steps can be performed efficiently and smoothly.

FIG. 4 is a perspective view showing a second step (late stage) of the construction method of the present invention, in which the roller 53 or the spacer 58 of the centering device 50 explained in the previous figure is brought into contact with the outer peripheral surface of the submerged block. Adjust the push bolt 51b to
While confirming the proper position such as movement, excavate and excavate the bottom of the bottom sunk block with a clam cell, human power, etc.
When 0 is inserted into the soil, a slow-hardening lubricant D that hardens after a predetermined time is pressure-fed between the natural ground and the sunk block, and the reaction force of the blade opening B0 and the circumferential surface friction of the sunk block are removed. The above procedure is repeated to mount and connect the uppermost sunk blocks B2 in a predetermined number of steps to excavate the bottom surface, and the topmost sunk blocks are exposed to the first bottom surface 5 by a predetermined dimension (connection). It is settled to the position where it can be worked.

FIG. 5 is a perspective view showing the third and fourth steps of the construction method of the present invention. Since the sedimentation work approaches the final stage,
The figure shows a state in which a settling control device 130 is installed to prevent accurate bottoming to a predetermined depth and to prevent accidental oversubsidence during the process.
The sedimentation control device 130 fixes the reaction force receiving base portion 110 to the anchor bolt 25, and the standing force surface 10 of the reaction force receiving base portion 110.
9, a guide rail 115 of a predetermined length is vertically projected so as to project above a predetermined dimension, and a bracket 116, which is slidable and detachable on the guide rail 115, is inserted through a fixing pin 105 into an engagement hole 104 at a predetermined position. Engagement, a pressing cylinder 120 is hung vertically on the connecting portion of the bracket 116, the upper surface of the upper block is provided so as to be pressed, and the submerged block B is provided to prevent excessive subsidence.
In order to reduce the reaction force of the blade opening portion B0 and the peripheral surface friction of the sinking block, the screw rod 86 connected to 2 is inserted into the screw rod insertion hole 96 of the bracket 116 and the stop nut 87 is screwed upward by a predetermined dimension. A predetermined amount of slow-hardening antifriction material D (which hardens after a predetermined time) is press-fitted from the conduit P1, and the pressure cylinder 120 is operated by fluid pressure to control sedimentation and excavate and discharge earth and sand on the inner bottom surface, which is required. According to the above, a predetermined number of upper blocks are connected in the same manner as described above, and the pressing cylinder 120
And the stop nut 87 for preventing excessive subsidence are adjusted to settle to a predetermined depth, and the third step is completed.

In the next fourth step, the bracket 116 of the sedimentation control device 130 is lowered to press the upper surface BT to excavate and discharge the earth and sand on the inner bottom surface, and at the end of the fourth step, the uppermost set block is removed. Settle down to the position of the chain double-dashed line BT ', then add coagulant to the bottom slime, remove water and separated agglomerates, and then add cement-based solidifying material ck to improve bottom soil quality, After the cement-based solidifying material ck is hardened, the bottom-filled concrete C is placed, and after the bottom-filled concrete is hardened, the inside is drained, and the sedimentation control device 130, the over-subsidence preventing screw rod 86, the centering means 50, etc. are removed, and the rest is left. The slow-hardening antifriction material D is press-fitted and filled in the gap G, and the fourth step is completed.

Next, the propulsion process of the pipe (propulsion pipe S) from the propulsion pipe starting hole H (which also serves as the reaching hole) inside the bottom sinking block B1 is performed.

FIG. 6 is a cross-sectional view showing the fifth step of the construction method of the present invention (after completion of the propulsion step of the propulsion pipe S), in which the intermediate floor slab block F having an opening eccentrically provided above the submerged block is mounted. The manhole M is mounted on the intermediate floor slab block F, the concrete 40 is removed, and the excavation hole 1 is removed.
The space of 5 is backfilled and the fifth step is completed, and steps (not shown) for lifting and other accessories are attached.

FIG. 7 is a perspective view showing an over-subsidence prevention device 90 according to claim 3 of the present invention, which is an alternative to the over-subsidence prevention by the bracket 116 used in the third and fourth steps, and is provided on the first bottom surface. An anchor bolt 25 is separately provided on the concrete 40, and a screw rod 86 for preventing over-subsidence which is inserted through the bracket 116 of the sedimentation control device 130 is inserted into the screw rod insertion hole 96 of the over-subsidence preventing base 97 fixed to the anchor bolt 25. The screw rod 86 was inserted, and the screw rod 86 was screwed into the screw rod connecting portion 56 at the upper part of the connecting fitting 57 that was connected to the uppermost submerged block, and the stop nut 87 was screwed into a required position of the screw rod 86 protruding upward from the screw rod insertion hole 96. An over-subsidence prevention device 90 is provided.

FIG. 8 is a sectional view showing an embodiment according to claim 4 of the present invention, and partially showing the vicinity of the blade opening B0 of the sunk block. A blade opening when there is spring water in the shaft in the second to fourth steps of the construction method and it is difficult to visually recognize the excavation state of the inner bottom portion of the blade opening B0, or when it is difficult to excavate with an excavator such as a clam cell. A conduit P2 used for dropping,
An operation valve V is provided at a proper position to provide a conduit P2 indicating a depth scale m, and a horizontal portion ph having a required length is provided at the lower end of the conduit P2 by an inverse T.
Are provided in a connected manner in the form of a plurality of holes N in the horizontal portion ph, compressed air is pressure-fed to the conduit P2, and the sediment on the inside of the blade portion B0 is checked while confirming the settling depth by the depth scale and the tactile sensation. Is provided so that it can be collapsed (the blade can be dropped). In addition, the code | symbol D in a figure is the slow-hardening antifriction material D with which the void part G with the natural ground was filled.

FIG. 9 is an exploded perspective view of a settling control device according to a fifth aspect of the present invention. The settling control device 130 is a reaction force receiving member 110 that can be fixed to the anchor bolt 25 embedded in the first bottom surface 5. The standing leg portion 109 is provided on the
Further, a guide rail 115 provided with a plurality of locking holes 104 at predetermined positions in the longitudinal direction is protruded and screwed to an upper portion of a required dimension so that the guide rail 115 can slide and the fixing pin 105 can be inserted into the locking hole 104. 116 provided so that it can be locked
And a pressing cylinder 120 having one end connected to the lower surface of the bracket 116 and a pressing portion 119 provided at the other end, and the screw rod 86 connected to the sinking block for preventing excessive subsidence is inserted into the screw rod insertion hole 96 of the bracket 116. A stop nut 87 is adjustably screwed on the upper portion. The screw rod 8
Reference numeral m of 6 is a depth scale m, and the pressing portion 119 is notched on the outside in order to press the upper surface BH while avoiding the connecting fitting 57 provided with the screw connecting portion 56 shown in the lower part of the drawing.

FIG. 10 is an exploded perspective view of an essential part of a sedimentation control device according to claim 6 of the present invention. The guide rail 115B of the sedimentation control device 130 is provided with a rack-shaped meshing portion 114, and the guide rail is also provided. A bracket 116B slidably engaged with 115 is provided, and a ratchet 122, which floats only when descending, is provided in the bracket 116B by a spring SP so as to constantly urge the engagement portion 114 so that the engagement portion 114 can engage with the engagement portion. When the bracket 120B is retracted, the bracket 116B becomes 1
The ratchet 12 is provided so that it can automatically descend for the stroke.
2 is provided with a handle 122h, and by pushing down the handle 122h and inserting the opening pin 122p into the insertion hole of, the ratchet 122 can be disengaged.
On the pressing portion 119 below the pressing cylinder 120 that is vertically installed at B, a fixing bolt 119 for engaging with the submerged block is provided.
b is provided. The pressing cylinder 120 is preferably a double-acting type. In the case of a single-acting pressing cylinder, a tension spring (not shown) for contraction is interposed between the plunger and the cylinder, between the bracket 116B and the pressing portion 119, or a cylinder with a built-in spring is used. You may use. In the figure, 110b is a fixing bolt 110b of the guide rail 115, and 116p is a fixing pin 116p of the bracket 116.
It is.

FIG. 11 shows a submerged block used for a manhole / propulsion shaft, which is a rectangular cutting edge with a triangular cross section (inclined inside) formed of steel plate and filled with concrete inside, with rounded corners. The part B0 is provided, and the blade opening part B0
A packing block for the bottom, which is provided with a packing pa around the upper part and simultaneously forms a propulsion pipe starting (reaching) well hole H at the time of driving, and which is vertically divided and then integrally joined and vertically connectable. B1 is fixed to the inside of the packing pa at the upper part of the blade opening B0, and is vertically divided and manufactured in the same manner as the sinking block B1 for the bottom part, and then integrally joined to provide the required number of steps for the upper step. The submerged blocks B2 are placed and sealed so that the vertical divisional connecting portions are alternately positioned, and the intermediate floor slab block F, which is eccentrically provided with the opening K, is placed and sealed on the topmost submerged blocks B2. Then configured.

Further, the symbol p in the figure is a packing p for sealing.
The connection fitting 57 for connecting vertically is provided at the uppermost connection fitting 57, and the screw connection portion 56 of the screw rod 86 for preventing the excessive subsidence is provided at the connection fitting 57 at the uppermost stage, and at the propulsion pipe starting (arrival) hole H of the sinking block B1 for the bottom. Is equipped with a thick rubber cover CV that can be cut from the inside during the propulsion process so as not to interfere with sedimentation. In addition,
In the figure, the submerged blocks B1 and B2 having a rectangular cross-section formed by a plane so as to receive the reaction force of the propulsion device evenly are shown, but other shapes and the like can be freely changed without departing from the concept of the present invention. is there.

[0048]

According to the construction method of the manhole / propulsion vertical shaft according to the first aspect, the upper receiving frame and the lower receiving frame which are separable in the first step of the vertical shaft construction are used, and the simple steel sheet pile is vertically driven by using both receiving frames as guides. When the groundwater level is high, it is possible to temporarily suspend the earth from the ground where it is difficult to stand on its own, which facilitates the subsequent steps and allows the anchor bolts used in the subsequent steps to be firmly embedded. Since both the receiving frames and the simple steel sheet piles are removed after the concrete has hardened, it is easy to install the blade mouth part at the predetermined position on the second bottom surface, and the divided sunk block is lightweight and easy to handle and easy to use with a small crane. It can be placed, can be easily integrated from the inner surface by a cotter or bolt connection, and can be easily connected to the blade opening portion.
Further, the centering device or the centering spacer interposed between the anchor bolt and the sinking block makes it possible to make corrections at an initial stage while visually checking an appropriate position such as an inclination / movement amount during sinking.

In the latter half of the second step, the required number of submerged blocks are placed, excavation and subsidence are repeated, and the required number of submerged blocks are settled by the centering device and the like while adjusting the amount of inclination, the amount of movement and the like. In the 3rd and 4th steps, the overcrowding prevention screw rod is connected to the uppermost submerged block, inserted into the bracket, and the stop nut is screwed into the upper position within the overburden allowable range. Since it is possible to prevent unexpected oversubsidence within the allowable range, it is difficult and expensive to re-raise by a large crane and to repair excessive inclination, etc.It is difficult and expensive to prevent construction failure and danger to workers. You can

At the final stage of sedimentation, careful excavation and sedimentation is required. However, by the pressing cylinder connected to the guide rail of the sedimentation control device via the bracket, the friction of the peripheral surface of the sedimentation block and the reaction force of the cutting edge portion or more are exceeded. It can be easily performed while controlling the pressing, and the control can be performed while confirming a predetermined settling by adjusting the screwing position of the stop nut for preventing the excessive subsidence.
Since the bottom of the submerged block is treated and the bottom of the submerged block is processed, bottomed concrete is poured, so that a stable bearing force can be given to the submerged submerged block, and the manhole and propulsion shaft can be created in a short time with the minimum occupied area. It can be built and the total cost can be reduced.

In the second step of the present invention, the construction is performed using the bottom submerged block and the upper submerged block integrated outside (outside the drilling hole or in the manufacturing plant). It can be further shortened.

According to a third aspect of the present invention, in the third step of the first aspect, a screw rod for preventing oversubsidence inserted through the bracket of the sedimentation control device is fixed to a separately provided anchor bolt. Insert the screw rod through the screw rod insertion hole formed in the base of the oversubsidence prevention, and connect the screw rod for oversubsidence prevention with the stop nut screwed to the upper part of the allowable range for oversubsidence to the uppermost sink block, and move upward from the screw rod insertion hole. Since the stop nut is screwed into a required position of the protruding screw rod, it is possible to prevent excessive subsidence like the one provided in the sedimentation control device.

Further, in the second to fourth steps of the construction method, when it is difficult to visually recognize the excavated state of the bottom due to the spring water, a plurality of fine holes are formed at the lower end of the conduit on which the depth scale is displayed to provide the required length. Since the horizontal part is connected in an inverted T-shape, if compressed air is sent to the conduit by pressure, the sedimentation depth inside the blade part can be dropped for a short time while confirming the sedimentation depth with a depth scale and tactile sensation. It can be easily done with and can prevent excessive deep digging.

Further, in the sedimentation control device according to the fifth aspect, the reaction force receiving member fixed to the anchor bolt can absorb the reaction force by the pressing cylinder and the load at the time of preventing the excessive subsidence. It is possible to prevent the construction failure and the danger to the operator due to the trouble, and avoid complicated work such as re-raising with heavy equipment for correction.

Further, in the sedimentation control device according to the sixth aspect, since the bracket automatically descends by the retracted stroke when the pressing cylinder retracts, it is possible to save labor and time by changing the mounting position of the bracket each time. can do.

Further, if the submerged block shown in FIG. 11 is applied, it is inexpensive because it is manufactured separately and the starting shaft for propulsion is also formed at the same time, and because it is light due to the division, it can be easily carried into a narrow space, and is small in size. It can be installed with a crane and noise pollution can be reduced. By applying the construction method of the manhole / promotion settling pit, the sedimentation control device, and the sunk block, it is possible to reduce the road occupation width, noise pollution, total cost, etc. when constructing the manhole / promotion settling pit, There is an effect that work efficiency can be improved. An inexpensive casting block can be used as compared with a centrifugal casting block in which a fluid conduit is installed in the blade portion to remove the blade.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first step of a construction method according to claim 1 of the present invention.

FIG. 2 is a perspective view showing an initial stage of a second step of the construction method according to claim 1 of the present invention.

FIG. 3 is a perspective view of a centering device according to claim 1 of the present invention.

FIG. 4 is a perspective view showing a second step of the construction method according to claim 1 of the present invention.

FIG. 5 is a third construction method according to claim 1 of the present invention.
The perspective view which shows a 4th process.

FIG. 6 is a sectional view showing a fifth step of the construction method according to claim 1 of the present invention.

FIG. 7 is a perspective view of an over-subsidence prevention device according to claim 3 of the present invention.

FIG. 8 is a sectional view showing an embodiment according to claim 4 of the present invention.

FIG. 9 is an exploded perspective view of a sedimentation control device according to claim 5 of the present invention.

FIG. 10 is an exploded perspective view of a main part of a sedimentation control device according to claim 6 of the present invention.

FIG. 11 is a perspective view of a sinking block according to claim 7 of the present invention.

[Explanation of symbols]

B0-blade part B1-bottom sunk block (B1a and B1b are connected) B2-upper sunk block (B2a and B2b are connected) C-bottom filled concrete D-slow-hardening anti-friction material G-void Part F-Intermediate floor slab M-Known manhole P1-Conduit (for slow-hardening antifriction material D pumping) P2-Conduit (for compressed air to drop the blade) 5-First bottom surface (for drilling hole) 10 -Second bottom surface (for drilling hole) 15-Drilling hole 20-Upper receiving frame 22-Lower receiving frame 25-Anchor bolt 30-Simple steel sheet pile 40-Concrete 50-Centering device 50B-Centering spacer 53-Roller 56-Screw rod connection part 57 ─ Coupling metal fitting 58 ─ Spacer 86 ─ Screw rod 87 ─ Stop nut 90 ─ Over-subsidence prevention device 97 ─ Over-subsidence prevention base 104 ─ Locking hole 110 ─ Reaction force receiving member 114 ─ Mating part 1 15-guide rail 115B-guide rail (according to claim 4) 116-bracket 116B-bracket (according to claim 4) 120-pressing cylinder 122-ratchet 130-settling control device

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[Procedure amendment]

[Submission date] March 15, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art An excavation hole having a predetermined depth is provided at a planned site, and a liner plate for mountain stopper is connected from the inside of the excavation hole to the required depth in a cylindrical shape in the bottom direction and assembled manually, and the inside of the liner plate is then assembled. The bottom block of the cylindrical cross section by centrifugal force forming with a blade on the bottom of the excavation hole is hung, the earth and sand on the inner surface of the bottom block are excavated, and the submerged blocks of the same shape are placed and connected in sequence. A slab block with an opening is installed on the upper surface of the submerged block, a manhole is placed on the slab block, and the space on the slab block is backfilled to construct a manhole / promotion settling pit.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, in claim 2, the construction is made by using the bottom submerged block and the upper submerged block integrated outside (outside the drilling hole or in the manufacturing plant). It constitutes the construction method for the manhole / promotion sinking mine.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Further, in claim 3, in the third step,
The screw rod 86 for preventing over-subsidence which has been inserted through the bracket 116 of the settling control device 130 is inserted into the over-submergence preventing base portion 97 fixed to the anchor bolt 25, and the screw rod insertion hole 96 is formed.
And the stop nut 87 is screwed into a predetermined position of the screw rod 86 protruding upward from the screw rod insertion hole 96 by screwing the screw rod 86 into the screw rod connecting portion 56 of the connecting fitting 57 connecting the screw rod 86 to the uppermost submerged block. The construction method for a manhole / propulsion sinking establishment pit according to claim 1, wherein the oversubsidence prevention device 90 is replaced.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Further, in claim 4, in the second to fourth steps, when it is difficult to visually recognize the excavated state of the bottom due to spring water,
A conduit P2 provided by connecting a horizontal portion ph having a required length, which displays a depth scale m and has a plurality of pores N at the lower end, in an inverted T shape.
Is inserted into the inside of the blade opening portion B0 that is difficult to visually recognize, and compressed air is fed under pressure to collapse the earth and sand inside the blade opening portion B0 and discharge the soil. It constitutes the construction method for the described manhole / promotion sinking pit.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

[0017]

The operation of the construction method of the manhole / propulsion sinking establishment pit according to the present invention will be described below with reference to FIGS. 1 to 6. In the first step according to claim 1 shown in FIG. 1, a separable upper receiving frame 20 and lower receiving frame 22 are installed on the horizontal second bottom surface 10 of the excavation hole 15, and the outer peripheral surfaces of both receiving frames 20, 22 are used as guides. Since the simple steel sheet pile 30 can be easily vertically driven in a short time, the mountain bottom can be easily stopped even when the ground at the bottom of the second bottom surface 10 is temporarily difficult to stand on its own or when the groundwater level is high. , Concrete 4 placed outside the simple steel sheet pile 30
Anchor bolt 25 that 0 is fixed in the ground and used in the subsequent process
It is possible to build the required space necessary for subsidence work at a proper position without damaging the solid burial and the neighboring private land and housing.

[Procedure amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction contents]

Next, when the fifth step according to claim 1 shown in FIG. 6 is completed, a stable manhole / propulsion sinking pit can be constructed in a short time, and the road occupancy width of the planned construction site is small and the total cost is reduced. Can be reduced.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

FIG. 11 is a sinking block used for a manhole-promoting sinking pit, which is a rectangular blade with a triangular cross section (inclined inside) formed of steel plate and filled with concrete inside, with rounded corners. A mouth portion B0 is provided, a packing pa is provided around the blade mouth portion B0, and a propulsion pipe starting (arriving) well hole H is simultaneously formed at the time of driving, and it is manufactured by dividing it in the longitudinal direction and then integrally combining them. The bottom submerged block B1 provided so as to be vertically connectable is provided with a packing p above the blade opening B0.
a) The submerged block B2 for the upper stage, which is fixed to the inner side and is vertically divided and manufactured in the same manner as the submerged block B1 for the bottom portion, is integrally joined and vertically connectable, is divided into the subdivided blocks in the vertical direction. The intermediate floor slab block F is laid eccentrically on the uppermost sunk block B2, and the intermediate floor slab block F is laid and sealed so that the connecting portions are alternately positioned.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction contents]

[0048]

EFFECTS OF THE INVENTION In the manhole / propulsion sinking construction method according to the first aspect of the present invention, in the construction method of the vertical shaft, an upper receiving frame and a lower receiving frame which can be separated in the first step of constructing the vertical shaft are used, and both receiving frames are used as guides for the simple steel. The sheet pile can be driven vertically, and when the groundwater level is high, it is also possible to temporarily stop the ground that is difficult to stand on its own, which simplifies the subsequent steps and firmly anchors the anchor bolts used in the subsequent steps. Since both the receiving frames and the simple steel sheet piles are removed after the concrete has hardened in the early stage of the second step, it is easy to install the blade edge part at the predetermined position on the second bottom surface, and the divided sunk block is lightweight and easy to handle. Can be easily placed on a small crane, can be easily integrated from the inside by a cotter or bolts, and can be easily connected to the blade opening. Further, the centering device or the centering spacer interposed between the anchor bolt and the sinking block makes it possible to make corrections at an initial stage while visually checking an appropriate position such as an inclination / movement amount during sinking.

Claims (7)

[Claims] 1. An excavation hole is formed by excavating a planned site to a predetermined depth, and a bottom block having a blade mouth is hung in the excavation hole to excavate the earth and sand on the inner surface of the bottom block, and the submerged block in the upper stage is sequentially installed. Place a floor slab that has openings on the upper surface of the sunk block on the uppermost slab, and place a manhole on the floor slab to refill the voids on the floor slab. In the method of constructing a shaft, an excavation hole 15 in which a first bottom surface 5 and a second bottom surface 10 are provided stepwise.
On the second bottom surface 10, the upper receiving frame 20 and the lower receiving frame 22 configured to be vertically detachable and separated from each other by a predetermined distance are horizontally placed, and the simple steel sheet pile 30 is used with the outer peripheral surfaces of the upper receiving frame 20 and the lower receiving frame 22 as guides. A simple steel sheet pile 30 driven into the required depth and installed
First, concrete 40 is placed in the outer space and a predetermined number of anchor bolts 25 are projected on the concrete 40.
Step, after hardening the concrete 40, the upper receiving frame 20 and the lower receiving frame 22 are removed, the simple steel sheet pile 30 is removed, and the integrally formed blade opening B0 is horizontally installed at a predetermined position of the second bottom surface 10. A sunk block B1a for a bottom having an arbitrary cross-section, which is manufactured so as to be vertically divided and connectable, is hung on the upper part of the blade opening B0, and then sunk for a bottom with an arbitrary cross-section, which is also vertically split and manufactured. The block B1b is hung and connected, and the integrated block B1 is connected to the blade opening B0.
A centering device 50 is interposed between the outer circumference of the submerged block B1 and the anchor bolt 25, and the upper submerged block B2 is manufactured by dividing the submerged block B1 in the same manner as above.
a, B2b are suspended and connected to each other, and the integrated sunk block B2 and the aforesaid sunk block B1 are connected to each other, and when the earth and sand are excavated and excavated and the blade opening portion BO is inserted into the ground, the blade opening portion BO is inserted from the ground surface. While slowly feeding the slow-hardening antifriction material D through the conduit P1 inserted in the upper part, further excavating and excavating the soil to settle the block B.
2 is settled to a position where a predetermined dimension is exposed on the first bottom surface 5, and if necessary, a sunk block having a required number of steps is connected in the same manner as above to excavate and discharge the inside to settle to a position where a predetermined dimension is exposed on the first bottom surface 5. The second step, and then, the reaction force receiving base portion 110 of the sedimentation control device 130 is fixed to the anchor bolt 25, and the guide rail 115 of a required length is vertically provided on the standing leg portion 109 of the reaction force receiving base portion 110. A bracket 116 which is slidable and detachable on the guide rail 115 is locked at a predetermined position of the locking hole 104 of the guide rail 115,
The pressing cylinder 120 is attached to the connecting portion 117 of the bracket 116.
Is provided vertically so that the upper surface BT of the upper block can be pressed, and an excessive subsidence preventing screw rod 86 connected to the uppermost submerged block is loosely inserted into the screw rod insertion hole 96 of the bracket 116, and is inserted from the screw rod insertion hole 96. A stop nut 87 is screwed into a predetermined position above the protruding screw rod 86, and a predetermined amount of the slow-hardening antifriction material D is press-fitted from the conduit P1 into a gap G between the ground and the submerged block and pressed by fluid pressure. The third step of operating the cylinder 120 and adjusting the stop nut 87 to control sedimentation, excavating and discharging the earth and sand on the inner bottom surface to settle and settle to a predetermined depth, and then add water after the coagulant is added to the bottom slime. After removing the separated agglomerates, a cement-based solidifying agent is added, and after the cement-based solidifying agent is hardened, a bottom-filled concrete C is placed, and after the bottom concrete is hardened, it is drained to prevent the sedimentation control device 130 and oversubsidence. The screw rod 86 and the centering means 50 are removed, and the fourth step of filling the residual void portion G with the slow-hardening antifriction material D and the propelling step of the pipe channel from the inside of the sink block B1 for the bottom part are performed to propel the pipe channel. After the process is completed, an intermediate floor slab block F having an eccentric opening is installed and connected to the upper part of the submerged block, a known manhole M is placed on the intermediate floor slab block F, and the space for the excavation hole 15 is formed. A construction method for a manhole and propulsion sinking pit, characterized by comprising a fifth step of backfilling. 2. The method for constructing a manhole / propulsion vertical shaft according to claim 1, wherein the construction is performed using a bottom sunk block and an upper sunk block that are integrated outside. 3. The sedimentation control device 1 in the third step.
The screw rod 86 for preventing over-subsidence that has been inserted through the bracket 116 of 30 is inserted through the screw rod insertion hole 96 of the over-subsidence prevention base portion 97 fixed to the anchor bolt 25, and the screw rod 86 is connected to the uppermost submerged block. The over-subsidence prevention device 90 in which a stop nut 87 is screwed into a required position of a screw rod 86 which is screwed into the screw rod connecting portion 56 of the connecting fitting 57 and protrudes upward from the screw rod insertion hole 96 is replaced. The method for constructing a manhole and propulsion shaft according to Item 1. 4. In the second to fourth steps, when the excavated state of the bottom is difficult to see due to spring water, a horizontal scale ph having a required length with a depth scale m displayed and a plurality of fine holes N formed at the lower end is formed. Is connected to the inverted T-shape, the conduit P2 is inserted inside the blade opening B0, which is difficult to visually recognize, and compressed air is sent under pressure.
The method for constructing a manhole / propulsion vertical shaft according to claim 1, wherein the earth and sand inside is collapsed and the soil is discharged. 5. The sedimentation control device 130 fixes a reaction force receiving member 110 having a standing leg portion 109 to the anchor bolt 25, and a plurality of locking holes 104 are provided in the standing leg portion 109 at predetermined positions in the longitudinal direction. The guide rail 115 is provided so as to be erected,
A bracket 116 provided so as to be slidable on the guide rail 115 and lockable in the locking hole 104 is engaged, a pressing cylinder 120 having one end connected to the lower surface of the bracket 116 and a pressing portion 119 provided at the other end is provided. A settling control device characterized in that a screw rod 86 provided and connected to a sinking block for preventing excessive subsidence is loosely inserted into a screw rod insertion hole 96 of a bracket 116 and a stop nut 87 is screwed onto an upper portion of a required position. 6. The guide rail 115 of the sedimentation control device 130.
And a bracket 116B slidably engaged with the guide rail 115, and a ratchet 122 that floats only in the bracket 116B when it descends is formed by a spring SP. 11
6. The sedimentation control device according to claim 5, wherein the sedimentation control device is provided so as to be constantly urged so as to be capable of meshing. 7. A blade mouth portion B0 formed of a steel plate and filled with concrete and having a triangular cross section and having an arbitrary tubular shape is provided, and a packing pa is provided around the blade mouth portion B0, and the inside of the packing pa is punched. At the time of installation, a propulsion pipe starting hole H is formed at the same time, and it is manufactured by dividing it in the vertical direction and then integrally joined and fixed to a bottom submerged block B1 provided so as to be connectable vertically, the same as the bottom submerged block B1. After the vertical dividing is manufactured, the submerged blocks B2 for the upper stage of the required number of stages, which are integrally connected and vertically connectable, are placed and sealed so that the divided connecting portions in the vertical direction are alternately located. A sunk block, characterized in that an intermediate floor slab block F, which is eccentrically provided with an opening, is placed and sealed on the sunk block B2 in the upper stage.