JP5960785B2 - Concrete box for open shield method - Google Patents

Description

  The present invention relates to a concrete box used in an open shield method for constructing underground structures such as water and sewage systems and underground passages in an urban area.

  As is well known, the open shield method is a rational method that takes advantage of the open cut method (open method) and the shield method.

  In this open shield method, the front end of the rear aircraft is inserted into the rear end of the front aircraft, and it is possible to bend at the mating part to enable curve construction and to correct the direction. There is.

An example of the following patent document will be described. The open shield machine 1 is basically connected to the left and right side wall plates 1a, 1b and the length of these side wall plates 1a, 1b as shown in FIG. It is a shield machine which opened the front surface, rear surface, and upper surface which consist of the bottom plate 1c which does.
JP-A-10-96234

  As shown in FIG. 9, the open shield machine 1 is divided into a plurality of parts in the front-rear direction, and the front end of the rear body as the tail machine 3 is fitted into the rear end of the front body as the front machine 2, The fitting part can be bent.

  The front machine 2 mainly performs excavation, and has a front end and an upper surface as open surfaces, and the middle jacks 4 are arranged in a plurality of stages in the upper and lower sides, with the folded jacks 4 facing rearward and rearward. On the other hand, the tail machine 3 is provided with a concrete box 8, and the shield jacks 5 are arranged on the left and right sides of the front and rear in the body and in a plurality of upper and lower stages. In the figure, reference numeral 6 denotes a blade edge provided at the front end of the front machine 2, which in this example is a movable split blade edge, 7 is a retaining plate provided at the rear end of the tail machine 3, 9 is a strut, 10 is a press bar (push angle). ).

  As shown in FIGS. 10 to 13, the open shield method using such an open shield machine 1 is constructed between the start pit and the arrival pit. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated by the shovel excavator 12 installed on the ground, and the shield jack 5 of the shield machine 1 is extended to enter the start pit 11. The shield machine 1 is moved forward by taking a reaction force against the reaction force wall, the first concrete box 8 forming the underground structure is suspended from above, and the shield is shrunk in the tail machine 3 of the shield machine 1 Set with the strut 9 and the press bar 10 behind the jack 5. Further, the start pit 11 is constituted by a retaining wall such as a sheet pile, and in order to start the open shield machine 1, a part of the retaining wall 11 is mirror-cut, but if necessary, a front portion of the starting pit 11 by chemical injection or the like. The ground may be improved.

  Next, similarly, the excavator 12 excavates the earth and sand from the front surface or the upper surface of the front machine 2 and discharges it to advance the shield machine 1, and the second concrete box is placed in front of the first concrete box 8. The body 8 is suspended in the tail machine 3. Hereinafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are sequentially buried in the ground in columns, and backfilled with a dump 14 on the rear concrete box 8, and an open shield machine When 1 reaches the reaching mine 13, it is disassembled and removed to complete the construction.

  In the figure, 15 is a grouting machine for injecting the back-filling material, and the primary grouting is performed around the concrete box 8 suspended in the tail machine 3, and the secondary grouting is performed after the shield machine 1 is propelled. Perform around the concrete box 8 left inside.

  By the way, the shield machine 1 is not only extended by extending the shield jack 5, but also by fixing the shield jack 5 and advancing the front machine 2 with respect to the tail machine 3 by extending the middle folding jack 4. Push it in two stages, 5 and the middle folding jack 4.

  At that time, if the left or right of the half-folded jack 4 is extended a lot, the front machine 2 changes its direction to the opposite side and bends in that direction. Further, if the upper or lower part is extended a lot, the front machine 2 changes its direction to the opposite side and bends upward or downward. Such curve construction or direction correction is possible.

  The press bar (push angle) 10 is for dispersing the propulsive force of the shield jack 5 and transmitting it to the concrete box 8. The press bar (push angle) 10 is usually made of steel such as H-section steel, and is separated from the shield jack 5 and installed each time.

  Incidentally, the installation work of the press bar 10 is an operation of installing the press bar 10 vertically so as to be in contact with the end face of the concrete box 8 arranged in the tail machine 3, and the removal work is the tail machine after completion of the propulsion. 3 is to remove the press bar 10 and temporarily place it on the ground.

Furthermore, in detail, the installation work is performed according to the following procedure.
i) Check the fixtures, wires, etc., and check the fixing status.
ii) Lift the press bars 10 one by one and install them at predetermined positions.
iii) After the installation, the press bar 10 is pressed by the shield jack 5 to prevent overturning.

The removal work is performed according to the following procedure.
i) Confirm that propulsion and clearance backfill are complete.
ii) Check equipment such as hanging metal fittings and wires, and after confirming the fixing condition, release the pressure of the shield jack 5 and remove the press bar 10.

  The concrete box 8 is made of reinforced concrete, and includes a left side plate 8a, a right side plate 8b, an upper floor plate 8c, and a lower floor plate 8d as shown in FIG. 10, and the front and rear surfaces are opened as openings 8e.

  In such an open shield construction method, as described above, the concrete box 8 is suspended in the tail portion of the shield machine 1 and leaves the tail portion in the ground as the open shield machine 1 advances. is there. And the concrete box is made of reinforced concrete and serves as a reaction force when the propulsion jack 3 is extended to advance the shield machine 1, although the press bar 10 is arranged at the front, A considerable load is applied to the front end, and this portion is split and broken, and cracks are easily generated. Moreover, the occurrence of such cracks is often from the corners of the concrete box 8, and the outer peripheral corners are applied.

  In particular, in the case of curve construction, the shield machine 1 is bent and moved forward with different strokes of the propulsion jack 3 arranged on the left and right inside the shield machine 1, and the concrete box 8 is also uneven on the left and right. Since the load is received, cracks and corners are more likely to be generated.

  In addition, the concrete box 8 is connected to the rear concrete box 8 with a steel rod or the like, but a sealing material is disposed on the joint surface for water stoppage. However, if an unbalanced load is applied by the propulsion jack 3, the sealing material may be broken, and the diameter of the concrete box 8 becomes larger as the diameter of the underground structure to be constructed increases. It is also difficult to completely stop water with a sealing material.

  Furthermore, although a steel collar may be arranged at the joint between the concrete boxes 8, such a steel collar is very laborious to install in a limited space in the shield machine 1, Workability is poor. Further, the use of such a steel collar is limited to the case of the concrete box 8 having a relatively small diameter.

  On the other hand, as shown in FIG. 10, the front and rear end surfaces of the concrete box 8 are flat surfaces, and no connecting portions are formed so as to be fitted to each other.

  In addition, although the concrete box in which such a connection part was formed, what is called a box culvert may be used by the open cut method, it has not been used by the open shield method until now.

  The reason for this is that the concrete box in which the connecting part is formed is formed with thin parts at the front and rear ends, and when this is subjected to a load when extending the propulsion jack 3, this part splits and breaks easily, and cracks are likely to occur. The conventional arrangement of the push angle 10 could not prevent the breakage.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to enable the use of a concrete box formed with a connecting portion used in the open cutting method also in the open shield method. An object of the present invention is to provide a concrete box for the open shield method that can prevent cracks and corners from being applied even if they are received.

In order to achieve the above object, the present invention as set forth in claim 1 is provided with a propulsion jack inside the left and right side wall plates, and excavates the earth and sand ahead of the front or upper surface opening of the open shield machine having front, rear and upper surfaces opened. The step of earth removal, the step of extending the jacking jack to advance the shield machine with the reaction force of the concrete box, and the new concrete box hung from the upper side behind the jacking jack shrunk in the tail of the shield machine It is a concrete box used for the open shield construction method in which concrete boxes are sequentially embedded in columns by repeating the steps of lowering and setting as appropriate, and is a substantially rectangular tube composed of a left side plate, a right side plate, an upper floor plate and a lower floor plate. The connecting portion is formed at one end, the connected portion is formed at the other end, the connecting portion is a male member having a substantially rectangular tube shape, and the connected portion has an inner peripheral length connected. Length of the outer periphery of the part Ri long substantially rectangular cylindrical shape, a female member capable of fitting to the outer peripheral surface of the connecting portion, according to steel in the female member of the front end surface of the concrete box making bodies down hanging in the tail portion of the shield machine a press bar, The gist of the invention is to attach and detach a press bar in which engaging members to the left side plate and the right side plate of the concrete box are attached sideways by fitting.

  According to the first aspect of the present invention, since the concrete box can be a cut box having connecting portions formed on the front and rear end faces, the box material cost is reduced.

  In addition, a press bar made of steel is attached to and detached from the female member on the front end face of the concrete box suspended in the tail part of the shield machine by fitting, so that the surface can be covered with a press bar that fits even in a thin part. Even if it receives the load for extrusion by a propulsion jack, generation | occurrence | production of a crack and a corner | angular part can be prevented.

Furthermore, the press bar can be fitted stably by attaching the engaging member sideways.

The present invention is claimed in claim 2, wherein the press bar using H-shaped steel, by lack half of one side of the flange of the H-shaped steel, the flange does not lack the front face cover plate of the female member, the remaining The gist is that the female member is engaged with the inner periphery.

  According to the second aspect of the present invention, a press bar made of a steel material that can be fitted to the female member on the front end face of the concrete box is simply manufactured by using H-shaped steel and only lacking a part thereof. Can do.

  The gist of the present invention described in claim 3 is that a steel plate that is longer than this is superposed as a contact plate on the front surface of the flange that does not lack.

  According to the third aspect of the present invention, the abutment plate protrudes up and down with respect to the engaging portion, and the upper protrusion protrudes above the upper floor plate of the concrete box and is suspended here. Steel material can be provided.

The gist of the present invention described in claim 4 is that the engaging member is provided with a kanuki receiving member made of a channel material.

According to the fourth aspect of the present invention, when the cannula is set using the cannula receiver, the left and right press bars can be connected and fixed, and the press bar can be fitted more stably.

  As described above, the concrete box for the open shield method is a concrete box in which the connecting part used in the open-cut method can be used in the open shield method. Even if it receives, it can prevent generation | occurrence | production of a crack and a corner | angular part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of a concrete box for the open shield method of the present invention, FIG. 2 is a cross-sectional plan view of the same, and FIG. 3 is a longitudinal side view. 4 to 9, the open shield machine 1 is fitted with the fuselage, and the front end of the rear machine as the tail machine 3 is inserted into the rear edge of the front machine as the front machine 2. Thus, the airframe was divided into a plurality of parts in the front-rear direction so that they could be bent at the mutual fitting portions.

  The front machine 2 mainly performs excavation, and has a front end and an upper surface as open surfaces, and the middle jacks 4 are arranged in a plurality of stages in the upper and lower sides, with the folded jacks 4 facing rearward and rearward. In the figure, 6 is a blade edge provided at the front end of the front machine 2.

  As shown in FIGS. 6 to 9, the open shield method using such an open shield machine 1 is constructed between the start pit and the arrival pit. The open shield machine is assembled in the start pit 11, the ground in front of the start pit 11 is excavated by the shovel excavator 12 installed on the ground, and the shield jack 5 of the shield machine 1 is extended to enter the start pit 11. The shield machine 1 is moved forward by taking a reaction force against the reaction force wall, the first concrete box 8 forming the underground structure is suspended from above, and the shield is shrunk in the tail machine 3 of the shield machine 1 Set with the strut 9 and the press bar 10 behind the jack 5.

  Further, the start pit 11 is constituted by a retaining wall such as a sheet pile, and in order to start the open shield machine 1, a part of the retaining wall 11 is mirror-cut, but if necessary, a front portion of the starting pit 11 by chemical injection or the like. The ground may be improved.

  Next, similarly, the excavator 12 excavates the earth and sand from the front surface or the upper surface of the front machine 2 and discharges it to advance the shield machine 1, and the second concrete box is placed in front of the first concrete box 8. The body 8 is suspended in the tail machine 3. Hereinafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are sequentially buried in the ground in columns, and backfilled with a dump 14 on the rear concrete box 8, and an open shield machine When 1 reaches the reaching mine 13, it is disassembled and removed to complete the construction.

  In the present invention, the concrete box 8 is made of reinforced concrete and comprises a left side plate 8a, a right side plate 8b, an upper floor plate 8c, and a lower floor plate 8d as shown in FIG. 10, and the front and rear surfaces are opened as openings 8e. Although it is the same as the prior art in that it has a substantially rectangular tube shape, the connecting portion 16 is formed at the rear end portion of the front and rear end portions, and the connected portion 17 is formed at the other end portion.

  The connecting portion 16 is a substantially rectangular tube-shaped male member formed with a thin portion 16a having a step toward the rear, and the connected portion 17 has an inner peripheral length longer than an outer peripheral length of the connecting portion 16. This is a female member that has a long, substantially rectangular tube shape, and has a concave portion 17a that can be fitted to the outer peripheral surface of the thin portion 16a of the connecting portion 16 on the inner periphery.

  As the concrete box 8, a so-called box culvert used in the open-cut method can be used.

  In the present invention, the press bar (push angle) 10 is an H-shaped steel, which is a steel material, that can be attached to and detached from the female member of the connected portion 17 at the front end of the concrete box 8 by fitting. did.

  Of the flanges 19, 20 of the H-shaped steel 18, half of the flange 19 on one side is omitted, the flange 20 that does not lack is used as the front end face covering plate of the female member, and the remaining half (web 21 and flange 19) is female. It is set as the engaging part to the inner periphery of a shape member.

  The part which becomes the engaging part to the inner periphery of the female member is notched in a round shape so that the upper and lower parts engage with the rounded corners on the inner periphery of the female member of the concrete box 8.

  A steel plate that is longer than the steel plate on the front surface of the flange 20 with respect to the engaging portion was superposed as a contact plate 25. The abutment plate 25 protrudes up and down, and the protruding length upward is higher than the upper floor plate 8c of the concrete box 8, and the suspension steel material 22 is provided here.

  Moreover, the engagement member 23 to the inner side surface of the left side plate 8a and the right side plate 8b of the concrete box 8 was attached to the web 21 that is an engagement portion to the inner periphery of the female member. The engaging member 23 is made of a short H-section steel.

  Further, the engagement member 23 is provided with a cannula receiver 24 made of a channel material.

  The press bar (push angle) 10 of the present invention can be attached to and detached from the female member of the connected portion 17 at the front end portion of the concrete box 8 by fitting, and is set as a set one by one on the left and right. The cannula receiver 24 faces the inside of the concrete box 8, and a pipe or the like can be passed as a cannula to strengthen the fitting state.

  Next, the usage will be described. As described above, the press bar (push angle) 10 is for dispersing the propulsive force of the shield jack 5 and transmitting it to the concrete box 8.

  In the open shield method using the open shield machine 1, the excavator excavates and removes soil from the front or top surface of the front machine 2 to advance the shield machine 1, and in front of the first concrete box 8 The second concrete box 8 is suspended in the tail machine 3. Thereafter, the same excavation and setting process of the concrete box 8 are repeated, and the concrete boxes 8 are successively buried in the ground in columns.

  The press bar (push angle) 10 is set on the front side of the concrete box 8 to be suspended in the tail machine 3 before or after being suspended. The forward movement of the tail machine 3 extends the shield jack 5. This is done by reacting the concrete box 8 with a reaction force. At this time, the press bar 10 is fitted to the female member on the front end surface of the concrete box 8 and the flange 20 is formed on the outside of the recess 17a, which is a thin wall part. Since the surface is covered, generation of cracks and corners can be prevented even when a load for extrusion by the propulsion jack 5 is applied.

  After the propulsion of the open shield machine 1, the cannula is removed from the cannula receiver 24, removed from the concrete box 8, and lifted upward to prepare for the next setting of the concrete box 8.

It is a front view which shows one Embodiment of the concrete box for open shield methods of this invention. It is a cross-sectional top view which shows one Embodiment of the concrete box for open shield methods of this invention. It is a vertical side view which shows one Embodiment of the concrete box for open shield methods of this invention. It is a vertical front view which shows the outline | summary of an open shield machine. It is a vertical side view which shows the outline | summary of an open shield machine. It is a side view which shows the 1st process of an open shield method. It is a side view which shows the 2nd process of an open shield method. It is a side view which shows the 3rd process of an open shield method. It is a side view which shows the 4th process of an open shield method. It is a perspective view which shows the prior art example of a concrete box.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front machine 3 ... Tail machine 4 ... Middle fold jack 5 ... Shield jack 6 ... Cutting edge 7 ... Earth retaining plate 8 ... Concrete box 8a ... Left side plate 8b ... Right side plate 8c ... Upper floor plate 8d ... Lower floor plate 8e ... Opening 9 ... Strut 10 ... Press bar 11 ... Start pit 12 ... Excavator 13 ... Arrival mine 14 ... Dump 15 ... Grout machine 16 ... Connecting part 16a ... Thin part 17 ... Covered Connecting portion 17a ... Recess 18 ... H-shaped steel 19, 20 ... Flange 21 ... Web 22 ... Suspension steel 23 ... Engagement member 24 ... Cannuki receiver 25 ... Contact plate

Claims (4)

Protrusion jacks are arranged inside the left and right side wall plates, and the process of excavating and discharging the earth and sand in front of the front or top opening of the open shield machine with the front, rear and top surfaces open, and the propulsion jacks to extend the concrete box The process of advancing the shield machine with the reaction force and the process of hanging and setting a new concrete box from the top behind the propulsion jack shrunk in the tail part of the shield machine are repeated as appropriate and sequentially Is a concrete box used for the open shield construction method, which is embedded in a column, and is a substantially rectangular tube shape consisting of a left side plate, a right side plate, an upper floor plate and a lower floor plate, with a connecting portion formed at one end, and the other end The connected portion is a male member having a substantially rectangular tube shape, and the connected portion has a substantially rectangular tube shape in which the inner circumference is longer than the outer circumference length of the connected portion. Can be fitted to the outer peripheral surface of In the form member according to steel in the female member of the front end surface of the concrete box making bodies down hanging in the tail portion of the shield machine a press bar, a left side plate of the concrete a box body, attached sideways engagement member to the right side plate A concrete box for the open shield method, characterized in that the press bar is attached and detached by fitting. The press bar using H-shaped steel, by lack half of one side of the flange of the H-shaped steel, the flange does not lack the front face cover plate of the female member, the engagement of the rest to the inner periphery of the female member The concrete box for the open shield construction method according to claim 1, which is a joint.   The concrete box for the open shield method according to claim 2, wherein a steel plate that is longer than this is superposed as a contact plate on the front surface of the flange that does not lack. Open shield method for concrete box making body according to claim 1, wherein the engaging member is provided with a yoke receiving by channel member.

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