CN109026030A - Tunnel circumferential direction digs method - Google Patents

Abstract

The invention discloses a kind of tunnel circumferential directions to dig method, it is installed in originating active well after bracing members frame, reaction frame and circumferential direction dig shield mechanism, jacking mechanism can be driven circumferential direction and dig shield mechanism circumferential direction driving, and under the cooperation of the Rear impacts such as pipe sheet assembling mechanism, control device, hydraulic transmission and slagging mechanism, the radial direction for completing the first ring in former tunnel digs work；Then the soil body for digging region to circumferential direction that side toward the former tunnel of section of jurisdiction are digged in assembled ring squeezes into more circumferentially distributed pipe curtain steel pipes and toward pipe curtain pouring concrete within steel pipe longitudinally to form cricoid pipe curtain supporting construction；Then, former tunnel is located to the soil body that encloses in pipe curtain supporting construction and after former section of jurisdiction excavates and remove, it is enclosed in pipe curtain supporting construction and applies armored concrete tubulose liner structure, the circumferential direction for completing tunnel digs work, and entire circumferential direction digs process and is not take up ground space, do not block the traffic and do not damage surface structures.

Description

Tunnel Circumferential Excavation Method

technical field

The invention relates to the technical field of tunnel expansion, in particular to a tunnel circumferential expansion method.

Background technique

At present, large and medium-sized cities build a large number of underground traffic tunnels (such as highways or subways, etc.). Among them, the variable cross-section section of the underground traffic tunnel (the lane gradually becomes wider, such as the entrance and exit of the highway ramp or the entrance and exit of the subway depot) is the difficulty and focus of the construction of the underground traffic tunnel. Excavation and excavation will be carried out on the basis of equal-diameter tunnels constructed by institutions. The excavation and construction methods of the variable section section of the traditional traffic tunnel include the open cut method, the cover excavation method, and the mining method. However, the above-mentioned construction methods will have a certain impact on ground traffic and buildings, and some (such as open and cut methods) also need to occupy a large amount of ground space.

With the development of the economy, in some areas with heavy ground traffic, dense population and buildings, there is no room for the above-mentioned construction methods, and the completely non-excavation construction method is almost the only choice to minimize the disturbance of the ground by tunnel construction and the ground environment.

Contents of the invention

The main purpose of the present invention is to propose a method for excavating circularly in the tunnel, which aims at avoiding occupying ground space and preventing impact on ground traffic and buildings.

In order to achieve the above object, the present invention proposes a method for encircling tunnel excavation, comprising the steps of:

S1. In the area to be excavated in the circular direction of the original tunnel, at least one row of original segments located at the bottom will be excavated along the longitudinal direction, and soil excavation will be carried out to form the initial working shaft for the circular expansion. A row of original segments includes at least two circumferentially adjacent original segments;

S2. Build a steel support frame and a reaction force frame in the starting working shaft to provide initial support force for the subsequent circumferential excavation of the circumferential expansion excavation shield mechanism;

S3. Complete the assembly work of the circular expansion shield mechanism in the starting working shaft, and make the jacking device of the circular expansion shield mechanism offset the reaction frame;

S4. Push the arc-shaped base plate of the circular excavation shield mechanism through the jacking device to drive the circular excavation shield mechanism to excavate in the circular direction and cut the soil. At the same time, the slag discharge mechanism will flow into the soil bin discharge of muck;

S5. After the circumferential expansion and excavation shield mechanism excavates a distance of an expansion segment, stop the excavation, and after separating the jacking device from the reaction frame, assemble it vertically in the newly excavated area through the segment assembly mechanism at least one reaming segment;

S6. Press the jacking device against the expanded excavation segment just assembled, and drive the circular expansion excavation shield mechanism through the jacking device to continue the circular excavation and cut the soil. soil discharge;

S7. Stop driving after the circumferential expansion excavation shield mechanism continues to excavate the distance of one expansion excavation segment in the circumferential direction;

S8. After excavating the original segment corresponding to the distance of an expanded excavation segment and cleaning the corresponding residual soil, separate the jacking device from the expanded excavation segment, and continue to assemble at least one expanded excavation segment vertically through the segment assembly mechanism piece;

S9. Repeat the operation according to steps S6 to S8 until the circular excavation shield mechanism excavates circularly to re-enter the starting working well;

S10. After dismantling the circumferential expansion mechanism, the steel support frame and the reaction frame and moving them out of the starting working well, pouring concrete to fill the starting working well;

S11. Assembling the ring to the last piece of expanded excavation segment, thereby completing the assembling work of the first ring expansion segment;

S12. On one side of the assembled one-ring expanded excavation segment, drive longitudinally into the soil in the area to be expanded in the original tunnel in the circular direction, and drive a plurality of circumferentially distributed pipe-curtain steel pipes and connecting ring-to-adjacent pipe-curtain steel pipes. The mother and child lock, and concrete is poured into the pipe curtain steel pipe to form a ring-shaped pipe curtain support structure;

S13. After excavating and dismantling the soil and the original segment of the original tunnel at the inner circumference of the pipe curtain support structure, construct a reinforced concrete tubular lining structure at the inner circumference of the pipe curtain support structure, and complete the circumferential expansion of the tunnel .

The technical solution of the present invention is to first place at least one row of original segments located at the bottom in the longitudinal direction in the area to be excavated in the circumferential direction of the original tunnel (a longitudinal row of original segments includes at least two circumferentially adjacent original segments) Cut open, and carry out excavation of soil body, form the originating work shaft that is used for circumferential expansion, and install steel support frame, reaction force frame and the shield mechanism of circumferential expansion excavation of the present invention in the initial work shaft, top The excavation device can drive the circular excavation excavation of the shield mechanism, and with the cooperation of the segment assembly mechanism, control device, hydraulic transmission device and slag discharge mechanism and other supporting systems, the circular expansion can be completely trenchless. The excavation method is to complete the radial expansion of the first ring of the original tunnel; then, on one side of the assembled first ring expansion segment, a plurality of circumferential rings are driven longitudinally into the soil in the area to be expanded in the original tunnel. The distributed pipe curtain steel pipes and the parent locks connecting the ring to the adjacent pipe curtain steel pipes, and concrete is poured into the pipe curtain steel pipes to form a ring-shaped pipe curtain support structure; then, the original tunnel is located in the pipe curtain support structure After the inner soil and the original segment are excavated and dismantled, a reinforced concrete tubular lining structure is constructed inside the pipe curtain support structure to complete the excavation work in the circumferential direction of the tunnel, and the entire excavation process in the circumferential direction does not occupy the ground space , not obstructing traffic and not damaging ground structures. In addition, the circular expansion excavation shield mechanism of the present invention can be assembled or recycled according to the length of the expansion area, which is flexible and efficient, and after the construction is completed, the circular expansion excavation shield mechanism can be recycled to save the circular expansion excavation. cost.

Description of drawings

Fig. 1 is the schematic diagram of the excavation and excavation shield mechanism in the circumferential direction;

Fig. 2 is a schematic diagram when the circumferential expansion excavation shield mechanism is installed in the starting working shaft and its jacking device is in contact with the reaction frame;

Fig. 3 is a schematic diagram of the circumferential expansion and excavation shield mechanism for a certain distance in the circumferential direction and the assembly of multiple expansion excavation segments;

Fig. 4 is a schematic diagram of the circumferential expansion excavation shield mechanism for one ring distance and returning to the starting working well;

Fig. 5 is a schematic cross-sectional view of the original tunnel after the circumferential expansion and assembling of a ring expansion segment;

Figure 6 is a schematic diagram of the longitudinal section of the original tunnel after the circumferential expansion and assembling of a ring expansion segment;

Fig. 7 is the schematic diagram after completing the ring-shaped pipe curtain support structure construction;

Fig. 8 is the schematic diagram after completing the construction of the circular tubular lining structure;

Fig. 9 is a schematic diagram after completing the construction of the rectangular tubular lining structure;

Figure 10 is a schematic diagram of the connection of two adjacent pipe curtain steel pipes in the circumferential direction;

Fig. 11 is a schematic diagram of the connection of two vertically adjacent pipe curtain steel pipes.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if the embodiment of the present invention involves directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, vertical, counterclockwise, clockwise, circumferential direction, radial direction, axial direction...), the directional indication is only used to explain the relative positional relationship, movement conditions, etc. When a change occurs, the directional indication changes accordingly.

In addition, if there is a description related to "first" or "second" in the embodiment of the present invention, the description of "first" or "second" is only for the purpose of description, and should not be understood as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The invention proposes a method for encircling tunnel excavation.

In the embodiment of the present invention, as shown in Fig. 1 to Fig. 11, the method for encircling tunnel expansion includes steps:

S1. In the area to be excavated in the circumferential direction of the original tunnel 100, at least one row of original segments 101 located at the bottom is excavated along the longitudinal direction, and the soil is excavated to form a starting working shaft for the circumferential expansion. 103 , a longitudinal row of original pipe sheets 101 includes at least two circumferentially adjacent original pipe sheets 101 .

Specifically, the number of rows of original segment 101 at the bottom to be excavated along the longitudinal direction of the original tunnel 100 depends on the size of the area to be expanded and excavated in the circumferential direction and the longitudinal dimension of the excavated and expanded shield in the circumferential direction. Direction chisels one row, two rows, three rows, four rows or more, as shown in Fig. 2 and Fig. 4, it is the situation of chiseling four rows.

Specifically, the step S1 of excavating the soil to form the starting working well 103 for circumferential expansion also includes the process of binding steel bars and pouring concrete to prevent the starting working well 103 from collapsing.

In the embodiment of the present invention, at least one row of original segment 101 located at the bottom (a longitudinal row of original segment includes at least two circumferentially adjacent original segments) is excavated along the longitudinal direction, and soil Before the excavation of the body, it also includes the grouting and reinforcement of the soil in the area to be excavated in the circumferential direction through the grouting holes (not shown) of the original segment 101 of the original tunnel 100 along the circumferential and longitudinal directions of the original tunnel 100. process, it should be noted that the grouting reinforcement range 106 should be larger than the area to be excavated circumferentially.

Further, in step S1, before soil excavation, a step of inserting steel sheet piles 107 on both sides of the soil to be excavated as retaining wall support is also included.

S2. Build a steel support frame 104 and a reaction force frame 105 in the starting working shaft 103 to provide initial support force for the subsequent circumferential excavation of the circumferential expansion excavation shield mechanism.

Specifically, the steel support frame 104 is mainly used to support the circular excavation excavation shield mechanism from the bottom, and the reaction force frame 105 is mainly used to offset the jacking device 6 of the circular excavation expansion mechanism. Tunneling provides the initial support reaction.

S3. Complete the assembling work of the circular expansion excavation shield mechanism in the starting working shaft 103, and make the jacking device 6 of the circular expansion excavation shield mechanism offset against the reaction force frame 105.

Specifically, the circular excavation and excavation shield mechanism includes a forward-curved arc-shaped base plate 1, and the left and right sides of the base plate 1 are provided with the center line of the base plate 1 (that is, a straight line formed by connecting the centers of all areas of the base plate 1) The side partition 2 extending in the direction, the side partition 2 is an arc-shaped plate that bends forward, and the center line of the side partition 2 coincides with the center line of the base plate 1, and the side partitions 2 on the left and right sides and An installation area is enclosed between the base plates 1, and at least one set of hoop shield units are installed in the installation area, and each group of hoop shield units includes a cutting device 3 located in the front section of the installation area and partially protruding forward from the installation area, installed in The supporting device located in the installation area and behind the cutting device 3, and the jacking device 6 installed in the installing area and positioned at the rear of the supporting device, the supporting device includes an earth bin 4 positioned behind the cutting device 3 and a mechanical Bin 5. During the working process, the jacking device 6 provides the thrust for the base plate 1 to drive in the circumferential direction. The cutting device 3 drives the cutter 31 on the cutter head to rotate and cut the soil. The soil bin 4 is used to accommodate the soil generated by the cut soil. muck. Specifically, the front wall of the soil bin 4 is provided with a slag inlet 41, and the muck generated by cutting the soil body by the cutting device 3 enters the soil bin 4 through the slag inlet 41, and is discharged through the slag discharge mechanism 500 matched with the shield mechanism. The bin 4 and the mechanical bin 5 are equipped with a driving device (not shown in the figure, such as including a rotating motor, a transmission mechanism, etc., which is the prior art and will not be described in detail here) connected to the rotating shaft of the cutting device 3, for driving the cutting device 3 The cutter 31 rotates and cuts the soil body, and the installation area is located behind the jacking device 6 and is used for splicing the expanded excavation segments 102 .

Specifically, the number of the hoop shield units is one or more groups, which can be determined according to the requirements for excavation expansion. direction) distribution, and are separated by the intermediate partition 7 fixed on the base plate, as shown in Figure 1, it is the case that four sets of ring shield units are installed in the installation space. Specifically, the middle partition 7 is also an arc-shaped plate curved forward, and the centerline of the middle partition 7 coincides with the centerline of the base plate 1 , but the circumferential length of the middle partition 7 is smaller than that of the base plate 1 .

It can be understood that the specific structure and arrangement of the soil bin 4, the mechanical bin 5 and the cutting device 3, as well as the cooperation relationship between the soil bin 4 and the supporting slag discharge mechanism 500 can refer to the traditional shield machine (for example, the publication number is "CN 1730907 A "compound balanced shield machine disclosed in the invention patent application" or the shield machine with a center drilling system disclosed in the invention patent application with the publication number CN 102287201 A), the soil bin 4, the mechanical bin 5 and the The embodiment of cutting device 3 is not repeated here.Certainly, there is a certain difference in the structure of the arc-shaped base plate 1 of the circularly expanding shield mechanism of the present invention and the cylindrical shield of the traditional shield machine, but this It does not affect the reference setting of the cooperation relationship between the earth bin 4, the mechanical bin 5 and the cutting device 3, and the earth bin 4 and the supporting slag discharge mechanism 500 of the circumferential expansion excavation shield mechanism of the present invention.

Specifically, the cutter 31 includes at least one of the hob cutter 311, the cutting cutter 312 and the center cutter 313, and the corresponding cutter type can be selected according to the type of soil, how the cutter 31 is installed on the cutter head, and the driving device How to drive the cutter head to rotate can refer to the installation method of the cutting device of the traditional shield machine, and will not be repeated here.

Further, the rear end of the side partition 2 is equipped with a seal brush 8 to reduce the entry of muck into the installation area from the rear during the excavation process.

S4. Use the jacking device 6 to push the arc-shaped base plate of the circular expansion excavation shield mechanism to drive the circular expansion excavation shield mechanism to excavate circularly and cut the soil. At the same time, the slag discharge mechanism will flow into the soil bin 4. The dregs are discharged.

It can be understood that, like the traditional shield machine, the circular expansion shield mechanism of the present invention also has a corresponding post-support system. The post-support system generally includes a segment assembly mechanism 200, a control device 300, a hydraulic transmission device 400 and a slag discharge device. Mechanism 500, wherein the segment assembly mechanism 200 is used to realize the circumferential and longitudinal (or axial) assembly of segments in the excavation area, and the slag discharge mechanism 500 is used to discharge the slag from the soil bin 4, and through The slag discharge pipeline 501 is transported to the earth moving vehicle 600, and is transported out of the tunnel by the earth moving vehicle 600. The difference from the traditional shield tunneling mechanism is that the segment assembling mechanism 200 in the supporting system corresponding to the circular expansion excavation shield mechanism of the present invention is located outside the circular expansion excavation shield mechanism, specifically, the original tunnel corresponds to the A gantry frame 700 is provided at the longitudinal two outer sides of the excavation area, and the segment assembly machine 200 is installed on the longitudinal transmission shaft 701 of the gantry frame 700, and can be driven by the hydraulic transmission device 400 along the gantry frame during work. The frame 700 is moved to adjust its longitudinal position, and the slag discharge mechanism 500 is located alone on the side of the area to be excavated in the circumferential direction, and is separated from the hydraulic transmission device and control device, which can effectively avoid mutual interference of construction and improve the efficiency of soil discharge and excavation.

S5. After the circumferential expansion and excavation shield mechanism excavates a distance of an expansion excavation segment 102 in the circumferential direction, stop the excavation, and after the jacking device 6 is separated from the reaction force frame 105, use the segment assembly mechanism 200 to excavate at the beginning of the excavation. At least one expanded excavation segment 102 is assembled longitudinally in the region;

Specifically, the number of expanded excavation segments 102 to be assembled longitudinally in the newly excavated area by the segment assembly mechanism 200 mainly depends on the longitudinal dimension of the circumferential expansion and excavation shield mechanism, for example, one, two, or three segments can be assembled longitudinally. , four or more, as shown in Figure 6, is the situation of longitudinally assembling four expanding and digging segments 102.

S6. Press the jacking device 6 against the expanded excavation segment 102 that has just been assembled, and drive the circular expansion and excavation shield mechanism through the jacking device 6 to continue the circular excavation and cut the soil. The muck in bin 4 is discharged.

In the embodiment of the present invention, arc-shaped grooves 21, 71 are provided on the inner side of the side partition 2 and/or on the side of the middle partition 7, and the centers of the arc-shaped grooves 21, 71 are located at the center of the base plate 1. On the center line, the jacking device 6 includes a plurality of jacks 62 and support shoes 61, the support shoes 61 are connected to one end of the corresponding jacks 62, the other end of the jacks 62 is connected to a guide 63, and the guide 63 is inserted into the arc In the grooves 21, 71, when working, the support shoe 61 is opposed to the reaction force frame 105 or the spliced expansion segment to provide a support reaction force when the jack 62 is extended, so that the other end of the jack 62 passes through the guide 63 Through the arc-shaped grooves 21, 71, the side partition 2 and/or the middle partition 7 provide the thrust of the circumferential excavation, that is, when the jack is extended, it is provided by the reaction frame against the support shoe or the spliced expansion segment. The support reaction force provides the thrust of the circumferential excavation to the side diaphragm and/or the middle diaphragm, thereby driving the circumferential excavation of the entire circumferential expansion excavation shield mechanism. Specifically, the support shoe 61 is hinged to one end of the jack 62, and the guide piece 63 is inserted into the arc-shaped grooves 21, 71, and the guide piece can be adjusted before or during the circumferential driving of the driving base plate 1 as required. 63 is at the position of the arc-shaped grooves 21, 71 to adjust the stress direction of the dividing plate and/or the intermediate dividing plate 7, and ensure that the ring-to-expanding excavation shield mechanism can protect the ring-to-drive.

In a preferred embodiment of the present invention, at least two concentric arc-shaped grooves 21, 71 are respectively provided on the inner surface of the side partition 2 and the two side surfaces of the middle partition 7 (as shown in FIG. 1 , For the case where two arc-shaped grooves 21, 71 are provided respectively), the arc-shaped grooves 21, 71 on the inner surface of each side partition 2 and the two side surfaces of each middle partition 7 correspond to at least two jacks 62 (As shown in Figure 1, it corresponds to the situation of two jacks 62 respectively), one end of the corresponding at least two jacks 62 is connected with the support shoe 61, and the other end is connected with the guide 63, and the guide 63 is inserted into the corresponding At least two of the arc-shaped grooves 21, 71. This setting method can enable the circumferential expansion shield mechanism to obtain a more uniform tunneling force during the tunneling process.

S7. Stop the excavation after the circumferential expansion and excavation shield mechanism continues to excavate a distance of one expansion excavation segment 102 in the circumferential direction.

S8. After excavating the original segment 101 corresponding to the distance from an expanded excavation segment 102 and cleaning up the corresponding residual soil, separate the jacking device 6 from the expanded excavation segment 102, and continue to assemble vertically through the segment assembly mechanism 200 at least one reaming segment 102;

Specifically, in step S8, the number of expanded segment segments 102 to be assembled longitudinally is consistent with the number of expanded segments 102 in step S5.

It can be understood that after excavating a segment 102 in each ring direction, the corresponding original segment 101 is excavated and the residual soil is cleaned, which can ensure the structural stability of the original tunnel 100 segment and prevent the original tunnel 100 from Segments are too large and deformed.

S9. Repeat the operation according to steps S6 to S8 until the circular excavation shield mechanism excavates circularly to re-enter the starting working shaft 103 (it should be noted that in step S9, the last piece of circular excavation should not be assembled first. pipe piece).

S10 , after dismantling the circumferential expansion mechanism, the steel support frame and the reaction frame and moving them out of the starting working shaft 103 , pouring concrete to fill the starting working shaft 103 .

As for how to pour the concrete into the ground, the existing technology is adopted, so it will not be repeated here, but attention should be paid to reserving the position of the last expansion excavation segment in the circumferential direction.

S11. Assemble the ring to the last expanded segment 102, thereby completing the assembling work of a ring expanded segment.

S12. On one side of the assembled one-ring expanded excavation segment, drive longitudinally into the soil body of the original tunnel to be expanded in the circular direction 106 area 106, and connect a plurality of circumferentially distributed pipe curtain steel pipes 9 and connect the circumferentially adjacent pipe curtains. The mother-to-child locking of the steel pipe 9, and concrete is poured into the pipe curtain steel pipe 9 to form a ring-shaped pipe curtain support structure.

Specifically, the existing pipe jacking method or ramming method can be used to drive a plurality of hoop pipes longitudinally into the soil in the area to be hoop excavated in the original tunnel on one side of the assembled annulus expansion excavation segment. The distributed pipe curtain steel pipes 9 and the mother-to-child locks connecting the ring to the adjacent pipe curtain steel pipes 9. Specifically, the child and mother locks include a child lock 92 and a female lock 91 respectively fixed on two circumferentially adjacent pipe curtain steel pipes 9, and the female lock 91 includes two intervals fixed (for example welded) on the ring The base bar 911 on the outer peripheral wall of a pipe curtain steel pipe 9, and the first limiting parts 912 extending from the ends of the base bar 911, the interval between the two first limiting parts 912 forms an insertion groove, The sub-lock 92 includes a guide bar 921 fixed to the outer peripheral wall of another pipe curtain steel pipe 9, the guide bar 921 is suitable for the insertion groove and can be inserted into the insertion groove, and the end of the guide bar 921 has to extend to the first The inner surface of the limiting portion 912 is in contact with the second limiting portion 922, and through the mutual limiting of the first limiting portion 912 and the second limiting portion 922, the two adjacent pipe curtain steel pipes 9 are clamped in the circumferential direction. .

Further, in step S12, before pouring concrete into the pipe curtain steel pipe 9, it also includes drilling peripheral wall openings (mostly plum blossom holes) between the adjacent pipe curtain steel pipes 9 at the periphery of the pipe curtain support structure. , not shown in the figure) and the process of grouting the small leading conduit 10 for reinforcement and water-stopping. The small leading conduit 10 is the prior art, and other specific structures will not be repeated here.

In the embodiment of the present invention, if the longitudinal length of the area to be excavated in the circumferential direction is greater than the length of a single pipe curtain steel pipe 9, it may be considered to overlap multiple (such as two or three or more) pipe curtain steel pipes 9 longitudinally, In order to make the vertically spliced pipe curtain steel pipes pass through the area to be excavated in the circumferential direction. Specifically, a tubular sub-joint 94 and a tubular female joint 93 can be respectively fixed (for example welded) at opposite ends of two vertically adjacent pipe curtain steel pipes 9, and the outer diameter of the tubular sub-joint 94 is the same as that of the tubular female joint 93. The inner diameter of the tubular female joint 93 is suitable and can be inserted into the tubular female joint 93. The overlapping areas of the tubular female joint 93 and the tubular sub-joint 94 are provided with a plurality of relative first screw holes and second screw holes (not marked) in the circumferential direction respectively. Bolts 95 are installed in the first screw hole and the second screw hole to detachably fasten the tubular sub-joint 94 and the tubular female joint 93 so as to overlap the vertically adjacent pipe curtain steel pipes 9 . Of course, the vertically adjacent pipe curtain steel pipes 9 can also be directly welded and fastened.

Further, after the tubular sub-joint and the tubular female joint are detachably fastened, a step of covering the outer periphery of the tubular female joint with sealing hemming or sealing tape (not shown) is included to prevent seepage and leakage.

S13. After excavating and dismantling the soil and the original segment of the original tunnel at the inner circumference of the pipe curtain support structure, construct a reinforced concrete tubular lining structure 108 at the inner circumference of the pipe curtain support structure, and complete the circumferential expansion of the tunnel Work. The entire circumferential expansion and excavation process does not occupy ground space, does not hinder traffic, and does not damage ground buildings. In addition, the circular expansion excavation shield mechanism of the present invention can be assembled or recycled according to the length of the expansion area, which is flexible and efficient, and after the construction is completed, the circular expansion excavation shield mechanism can be recycled to save the circular expansion excavation. cost.

Specifically, the tubular lining structure can be a circular tubular lining structure 108 (see Figure 8) or a polygonal (such as rectangular, see Figure 9) tubular lining structure 108. A concrete cushion 109 (see FIG. 9 ) is first poured between the bottom of the lining structure and the bottom of the inner circumference of the pipe curtain support structure to support the polygonal tubular lining structure 108 .

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of tunnel circumferential direction digs method, which is characterized in that comprising steps of

S1, region is digged to circumferential direction in former tunnel, along the longitudinal direction chisels at least row's original section of jurisdiction for being located at bottommost, and Soil excavation is carried out, is formed and originates active well for what circumferential direction digged, longitudinal row's original section of jurisdiction includes at least two pieces circumferential phases Adjacent former section of jurisdiction；

S2, bracing members frame and reaction frame are applied in active well originating, dig the subsequent circumferential driving of shield mechanism for circumferential direction and mention For initial support power；

S3, the circumferential assembled work for digging shield mechanism of completion in active well is being originated, and is making the circumferential top for digging shield mechanism It offsets into device and reaction frame；

S4, thrust is imposed by the arc-shaped substrate that jacking mechanism digs shield mechanism to circumferential direction, to drive circumferential direction to dig shield Mechanism circumferential direction tunnels and cuts the soil body, meanwhile, the dregs for flowing into Tu Cang is discharged by slagging mechanism；

S5, circumferential direction dig shield mechanism circumferential direction tunnel one piece dig the distance of section of jurisdiction after, stop driving, and by jacking mechanism After separating with reaction frame, section of jurisdiction is digged for longitudinal assembled at least one piece in the region just tunneled by pipe sheet assembling mechanism；

S6, jacking mechanism and the just assembled section of jurisdiction that digs are offseted, and by jacking mechanism driving circumferential direction dig shield mechanism after Continuous circumferential driving simultaneously cuts the soil body, meanwhile, it is discharged by the dregs that slagging mechanism will flow into Tu Cang；

S7, shield mechanism is digged in circumferential direction continue to stop driving after circumferential one piece of driving digs the distance of section of jurisdiction；

S8, it will just one piece of driving dig after section of jurisdiction chisels apart from corresponding former section of jurisdiction and clear up corresponding surflaes, by jacking mechanism It is separated with section of jurisdiction is digged, and longitudinally continues assembled at least one piece by pipe sheet assembling mechanism and dig section of jurisdiction；

S9, shield mechanism circumferential direction is digged by step S6 to S8 repetitive operation to circumferential direction tunnel to reentering and originate active well；

S10, circumferential direction is digged after mechanism, bracing members frame and reaction frame disassemble and remove and originate active well, carries out concreting Active well is originated with filling；

S11, last assembled circumferential block dig section of jurisdiction, to complete the assembled work that a ring digs section of jurisdiction；

S12, the soil body for digging region to circumferential direction in the past former tunnel in the side that assembled ring digs section of jurisdiction are longitudinally squeezed into more The circumferentially distributed pipe curtain steel pipe of root and the primary and secondary lock for connecting circumferential adjacent tubes curtain steel pipe, and coagulation is perfused in pipe curtain steel pipe Soil is to form cricoid pipe curtain supporting construction；

S13, former tunnel is located to the soil body enclosed in pipe curtain supporting construction and after former section of jurisdiction excavates and remove, in pipe curtain supporting construction It inside encloses and applies armored concrete tubulose liner structure, the circumferential direction for completing tunnel digs work.

2. tunnel circumferential direction as described in claim 1 digs method, it is characterised in that: carry out soil excavation, formed for circumferential direction It further include assembling reinforcement, the process of casting concrete in the step S1 for originating active well digged.

3. tunnel circumferential direction as described in claim 1 digs method, it is characterised in that: bottommost will be located at along the longitudinal direction At least row's original section of jurisdiction is chiseled, and further includes the circumferential direction and longitudinal direction along former tunnel, through former tunnel before carrying out soil excavation The injected hole of former section of jurisdiction treat the process that the circumferential soil body for digging region carries out grouting and reinforcing.

4. tunnel circumferential direction as described in claim 1 digs method, it is characterised in that: in the step S1, opened carrying out the soil body It further include the process in soil body two sides to be excavated insertion steel sheet pile as retaining wall before digging.

5. tunnel circumferential direction as described in claim 1 digs method, it is characterised in that: it includes to antecurvature that circumferential direction, which digs shield mechanism, The bent arc-shaped substrate, the left and right sides of substrate are equipped with the side partition extended to the centerline direction of substrate, and side partition is Become the arc-shaped plate that song and center line are overlapped with the center line of substrate forward, is enclosed between the side partition and substrate of the left and right sides At installing zone, at least one set of circumferential shield unit is installed in installing zone, every group of circumferential direction shield unit includes before being located at installing zone Section and part forward extend out the cutting apparatus of installing zone, loaded on installing zone and positioned at the supporting arrangement at cutting apparatus rear, and Loaded on installing zone and positioned at the jacking mechanism at supporting arrangement rear, the supporting arrangement includes being located at cutting apparatus rear Tu Cang and engine chamber positioned at the rear Tu Cang, in the course of work, jacking mechanism provides the thrust of circumferential driving, cutting for substrate Device drives the cutter on its cutterhead to rotate and cut the soil body, and Tu Cang is used to accommodate the dregs for being cut soil body generation, engine chamber The driving device connecting with the shaft of cutting apparatus is installed, for driving the cutter of cutting apparatus to rotate.

6. tunnel circumferential direction as claimed in claim 5 digs method, it is characterised in that: the jacking mechanism includes multiple jack And supporting boot, supporting boot are connected to one end of corresponding jack, the other end of jack is connected with guide part, and guide part is plugged in In corresponding side partition or middle partition arc-shaped slot, and in jack stretching, extension, by the reaction frame that offsets with supporting boot or The section of jurisdiction that digs spliced provides reaction of bearing, the thrust of circumferential driving is provided to side partition and/or middle partition, to drive whole A circumferential direction digs shield mechanism circumferential direction driving.

7. tunnel circumferential direction as described in claim 1 digs method, it is characterised in that: in step S12, be perfused in pipe curtain steel pipe It further include squeezing into the advanced of peripheral wall aperture between the circumferential adjacent pipe curtain steel pipe in pipe curtain supporting construction periphery position before concrete Ductule and slip casting carry out the process of reinforcing and sealing.

8. tunnel circumferential direction as claimed in any of claims 1 to 7 in one of claims digs method, it is characterised in that: digged when to circumferential direction When the longitudinal length in region is greater than the length of single pipe curtain steel pipe, the more root canal curtain steel pipes of longitudinal lap joint, so that after longitudinal spliced Pipe curtain steel pipe, which is passed through, digs region to circumferential direction.

9. tunnel circumferential direction as claimed in claim 8 digs method, it is characterised in that: two longitudinally adjacent root canal curtain steel pipes are opposite Both ends distinguish fixed adapter tube shape connector and tubulose female connector, the outer diameter of the sub- connector of tubulose and the internal diameter of tubulose female connector It is mutually suitable and can be inserted into tubulose female connector, the region of tubulose female connector and the sub- connector overlapping of tubulose respectively circumferential direction offer it is multiple opposite The first screw hole and the second screw hole, the first opposite screw hole and the second screw hole are equipped with bolt, by the sub- connector of tubulose and tubulose Female connector detachably fastens.

10. tunnel circumferential direction as claimed in claim 9 digs method, it is characterised in that: can by the sub- connector of tubulose and tubulose female connector It further include in the periphery cladding sealing bound edge of tubulose female connector or the process of sealant tape after disassembly fastens.