Fabricated composite open caisson structure for pipe jacking construction

Abstract

The utility model discloses an assembly type composite open caisson structure for pipe jacking construction. A reserved hole is formed in the side wall of an open caisson, and the open caisson structure comprises a cast-in-place part and a prefabricated pipe piece splicing part; the top end of the cast-in-place part is higher than the reserved hole by one meter, the inner wall face of the cast-in-place part is vertically aligned with the inner wall face of the prefabricated pipe piece splicing part, and a step is defined between the top end of the cast-in-place part and the outer wall face of the prefabricated pipe piece splicing part. A waterproof mortar layer and a water stop rubber plate layer are arranged between the top end of the cast-in-place part and the bottom end of the prefabricated pipe piece splicing part and serve as a waterproof connecting layer; an L-shaped steel plate is arranged at the step, a vertical plate of the L-shaped steel plate is connected with the bottom of the prefabricated segment splicing part through a chemical bolt, and a horizontal plate of the L-shaped steel plate is connected with the top of the cast-in-place part through a chemical bolt; an inner steel plate is arranged at the inner end of the waterproof connecting layer, the upper portion of the inner steel plate is connected with the bottom of the prefabricated pipe piece splicing part through chemical bolts, and the lower portion of the inner steel plate is connected with the top of the cast-in-place part through chemical bolts. Each layer of pipe joint comprises six prefabricated pipe pieces which are connected through arc-shaped bolts.

Description

Technical Field

[0001] The utility model relates to the field of trenchless municipal engineering construction, in particular to the caisson technology in pipe jacking construction. Background Technique

[0002] When carrying out underground pipeline construction in urban areas with complete various supporting facilities, it is not suitable to adopt the excavation method for construction for the purpose of protecting ground buildings and facilities, and pipe jacking construction has become a common construction method.

[0003] Pipe jacking projects need to construct structures such as working wells and receiving wells. In urban areas, there are often complex underground pipelines, limited surrounding working space, and many surface structures. Conventional steel sheet pile support or SMW method pile support require a large construction site, and the vibration generated by the main mechanical equipment during operation will disturb the surrounding soil mass and structures, and is prone to generate noise. Therefore, they are not the best construction methods for pipe jacking working wells and receiving wells in urban areas.

[0004] During the construction of conventional fully cast-in-place caissons, it is necessary to repeatedly go through cumbersome construction processes such as "steel bar binding → formwork erection → concrete pouring and curing → formwork removal". The construction site occupies a large area, the cycle is long, and the on-site environmental protection control is poor.

[0005] The disadvantages of fully prefabricated caisson construction are as follows: When leaving holes in prefabricated segments of prefabricated caissons, the manufacturing difficulty is large, special supporting formwork needs to be added, and the overall structural stability of the caisson segments will be poor.

[0006] The design idea of the utility model is to overall combine the cast-in-place caisson construction technology and the prefabricated caisson construction technology, avoid their respective defects, and pursue the highest possible construction efficiency and structural stability.

[0007] In the prior art, during the construction of assembled caissons, in-situ casting is often carried out for the cutting edge part (the bottom of the caisson) of the caisson. This is because different geological conditions have different requirements for the performance of the cutting edge, and in-situ casting of the cutting edge can adapt to different engineering needs. This method of in-situ casting of the cutting edge combined with precast pipe sections (composed of precast segments) is not the "overall combination" in the design concept of the present invention. The difference is that the existing technology of in-situ casting of the cutting edge combined with precast pipe sections fails to overall consider in-situ construction and assembly construction, and it is necessary to reserve holes on the precast segments of the caisson. Compared with the precast segments without reserved holes, the number of such precast segments is very small (only two precast segments have reserved holes, and the other precast segments are calculated as 6 segments per layer, with a total of more than a dozen to dozens). Making matching templates separately for these two precast segments with reserved holes has a high cost and low efficiency. The reserved hole is a weak part of the caisson structure, and using precast segments may cause problems such as poor overall structural stability. The above problems existing in the existing technology of in-situ casting of the cutting edge combined with precast pipe sections are also first proposed by the present invention. It is easy to understand when described, but before the present invention is described, it is not known to those skilled in the art. Summary of the Invention

[0008] The purpose of the present invention is to provide an assembled composite caisson structure for pipe jacking construction, which overall combines in-situ casting caisson construction technology and assembled caisson construction technology, pursues the highest possible construction efficiency and structural stability, and has less environmental harm.

[0009] To achieve the above purpose, for the assembled composite caisson structure for pipe jacking construction of the present invention, the caisson side wall has reserved holes for communicating with underground pipelines. Taking the direction pointing to the caisson center line as the inward direction and the reverse direction as the outward direction; it includes an in-situ casting part and a precast segment assembly part;

[0010] The top of the in-situ casting part is 1 meter higher than the reserved holes. The inner wall surface of the in-situ casting part is aligned with the inner wall surface of the precast segment assembly part up and down. The wall thickness of the in-situ casting part is greater than the wall thickness of the precast segment assembly part, so as to form a step between the top of the in-situ casting part and the outer wall surface of the precast segment assembly part;

[0011] A waterproof mortar layer and a waterstop rubber sheet layer are provided between the top of the in-situ casting part and the bottom of the precast segment assembly part; the waterproof mortar layer and the waterstop rubber sheet layer are collectively referred to as the waterproof connection layer;

[0012] An L-shaped steel plate is provided at the step. The vertical plate of the L-shaped steel plate is connected to the bottom of the precast segment assembly part through chemical bolts, and the horizontal plate of the L-shaped steel plate is connected to the top of the in-situ casting part through chemical bolts;

[0013] An inner steel plate is provided at the inner end of the waterproof connection layer. The upper part of the inner steel plate is connected to the bottom of the precast segment assembly part through chemical bolts, and the lower part of the inner steel plate is connected to the top of the cast-in-place part through chemical bolts.

[0014] The precast segment assembly part includes several layers of pipe sections assembled by precast segments;

[0015] Each layer of pipe section includes 6 arc-shaped precast segments, and the central angle of each precast segment is 60 degrees;

[0016] The structures of the precast segments are the same. In the same layer of pipe section, the lateral end faces of two circumferentially adjacent precast segments are the same-layer connection end faces, and there is a same-layer end face waterproof connection structure between the two same-layer connection end faces;

[0017] In the upper and lower adjacent layers of pipe sections, the upper and lower end faces of two adjacent precast segments are adjacent-layer connection end faces, and there is an adjacent-layer end face waterproof connection structure between the two adjacent-layer connection end faces;

[0018] The same-layer connection end face and the adjacent-layer connection end face are collectively referred to as the connection end face. The connection end face includes an A-end end face and a B-end end face. A fitting groove is recessed in the middle of the A-end end face, and a protruding part that fits into the fitting groove is provided convexly in the middle of the B-end end face;

[0019] Waterstop half-holes are respectively provided on the A-end end face and the B-end end face on both sides of the protruding part. Two waterstop holes are formed by fitting two mutually corresponding waterstop half-holes on the A-end end face and the B-end end face. Water swelling waterstop strips are respectively provided in the two waterstop holes.

[0020] Chamfer structures are respectively provided at the inner and outer ends of the A-end end face and the B-end end face. The chamfer structures at the inner and outer ends of the A-end end face and the B-end end face respectively form an inner groove and an outer groove. An inner waterproof mortar structure is provided in the inner groove, and an outer waterproof mortar structure is provided in the outer groove.

[0021] Each precast segment has two lateral end faces, two upper and lower end faces, one outer wall surface and one inner wall surface. The lateral end faces and the upper and lower end faces are collectively referred to as end faces. Three arc-shaped bolt holes are evenly provided on each end face of the precast segment, and each arc-shaped bolt hole extends to the inner wall surface. An operation groove for facilitating the operation of the arc-shaped bolt is recessed on the inner wall surface around the opening of each arc-shaped bolt hole;

[0022] In the same layer of pipe section, the arc-shaped bolt holes between two circumferentially adjacent precast segments correspond to each other, and the two circumferentially adjacent precast segments are connected by arc-shaped bolts. Both ends of each arc-shaped bolt are respectively located in the corresponding operation grooves of the two circumferentially adjacent precast segments;

[0023] Among two adjacent upper and lower pipe sections, two adjacent precast segments are connected by arc-shaped bolts, and both ends of each arc-shaped bolt are respectively located in the corresponding operation grooves of the two adjacent upper and lower precast segments.

[0024] The utility model has the following advantages:

[0025] The structure of the utility model is simple. Under the guidance of the design concept of the utility model, the structures of the cast-in-place part and the precast segment assembly part are overall designed during the caisson construction, the construction of the cast-in-place part and the precast segment assembly part is overall arranged, the advantages of both the cast-in-place and precast processes are integrated, the respective defects are avoided, the construction efficiency is improved compared with both the cast-in-place and precast processes, the structural stability is good, and the pressure of environmental protection treatment is small.

[0026] Specifically, compared with the cast-in-place process, the structure of the utility model reduces a large number of cumbersome construction processes such as "steel bar binding → formwork erection → concrete pouring and curing → formwork removal", reduces the occupied area of the construction site, improves the construction efficiency and has less pressure on on-site environmental protection control. Compared with the precast process, there is no need to separately set up matching formworks for only two precast segments, all segments are completely the same, the production efficiency of the precast segments is improved, and when storing, transporting and assembling, there is no need to distinguish between two precast segments with reserved holes, and no special attention and selection are required, thus improving the efficiency during storage, transportation and assembly as a whole.

[0027] The waterproof connection layer plays a good waterproof role. Among them, the waterproof mortar layer is closely matched with the cast-in-place part and can firmly bond and fix the waterstop rubber plate layer upwards. The precast segment assembly part forms a good sealing and matching relationship with the waterstop rubber plate layer under the action of gravity, and the overall structure is firm and the waterproof efficiency is good.

[0028] The L-shaped steel plate can firmly connect the cast-in-place part and the precast segment assembly part at the step, and the inner steel plate firmly connects the cast-in-place part and the precast segment assembly part on the outer wall surface of the caisson, making the cast-in-place part and the precast segment assembly part closely combined and the structure firm.

[0029] The inner waterproof mortar structure and the outer waterproof mortar structure play a waterproof role at the inner and outer ends of the connection end face, and the two water-swelling waterstop strips and the convex parts play a waterproof role in the middle of the connection end face, forming a total of five waterproof structures, so that the waterproof performance of the utility model basically reaches that of a caisson formed by full casting.

[0030] In the utility model, adjacent segments are all connected by three arc-shaped bolts, and the operation grooves at both ends of each arc-shaped bolt are all located on the inner wall surface of the caisson. In the caisson, all adjacent precast segments can be connected by the arc-shaped bolts, which facilitates the connection operation between the precast segments and improves the connection efficiency between the precast segments. Description of the Drawings

[0031] Figure 1 is a schematic cross-sectional structure diagram of the joint between the cast-in-place part and the precast segment assembly part of the present utility model, and the cross-section is a vertical plane.

[0032] Figure 2 is a three-dimensional structure diagram of a single precast segment.

[0033] Figure 3 is a three-dimensional structure diagram of a single precast segment showing hidden lines.

[0034] Figure 4 is a schematic cross-sectional structure diagram of the connection between two circumferentially adjacent precast segments belonging to the same layer of pipe joints, and the cross-section is a horizontal plane.

[0035] Figure 5 is Figure 4 an enlarged view of part A in

[0036] Figure 6 is a schematic cross-sectional structure diagram of the connection between two vertically adjacent precast segments, and the cross-section is a vertical plane. Detailed Description of the Preferred Embodiments

[0037] As Figures 1 to 6 shown, the present utility model discloses an assembled composite caisson structure for pipe jacking construction. The caisson side wall has a reserved hole for communicating with the underground pipeline. Taking the direction pointing to the caisson center line as the inner direction and the opposite direction as the outer direction; the assembled composite caisson structure for pipe jacking construction of the present utility model includes a cast-in-place part 1 and a precast segment assembly part 2; the reserved hole is located in the cast-in-place part 1; the reserved hole of the caisson is a conventional technology and is not shown in the figure.

[0038] The top end of the cast-in-place part 1 is 1 meter higher than the reserved hole, the inner wall surface of the cast-in-place part 1 is vertically aligned with the inner wall surface of the precast segment assembly part 2, and the wall thickness of the cast-in-place part 1 is greater than the wall thickness of the precast segment assembly part 2, so as to form a step between the top end of the cast-in-place part 1 and the outer wall surface of the precast segment assembly part 2;

[0039] A waterproof mortar layer and a waterstop rubber sheet layer are provided between the top end of the cast-in-place part 1 and the bottom end of the precast segment assembly part 2; the waterproof mortar layer and the waterstop rubber sheet layer are collectively referred to as the waterproof connection layer 3; both the waterproof mortar and the waterstop rubber sheet are conventional technologies, and the waterproof mortar layer and the waterstop rubber sheet layer are not shown in detail in the figure.

[0040] An L-shaped steel plate 4 is provided at the step. The vertical plate of the L-shaped steel plate 4 is connected to the bottom of the precast segment assembly part 2 through chemical bolts 5, and the horizontal plate of the L-shaped steel plate 4 is connected to the top of the cast-in-place part 1 through chemical bolts 5;

[0041] An inner steel plate 6 is provided at the inner end of the waterproof connection layer 3 , the upper part of the inner steel plate 6 is connected to the bottom of the prefabricated pipe segment assembly part 2 through chemical bolts 5 , and the lower part of the inner steel plate 6 is connected to the top of the cast-in-place part 1 through chemical bolts 5 .

[0042] The utility model has a simple structure. Under the guidance of the design idea of ​​the utility model, the cast-in-place part 1 and the prefabricated pipe segment assembly part 2 are comprehensively arranged in the caisson construction, combining the advantages of the two processes of cast-in-place and prefabrication, avoiding their respective defects, and improving the construction efficiency compared with the two processes of cast-in-place and prefabrication, with good structural stability and less pressure on environmental protection treatment.

[0043] Specifically, compared with the cast-in-place process, the structure of the utility model reduces a large number of cumbersome construction processes such as "rebar binding → formwork support → concrete pouring and maintenance → formwork removal", reduces the area occupied by the construction site, improves construction efficiency, and reduces the pressure of on-site environmental protection control. Compared with the prefabrication process, it is no longer necessary to set up a matching formwork for only two prefabricated segments, and all the pipe plates are completely consistent, which improves the efficiency of prefabricated segment production. It is no longer necessary to distinguish between two prefabricated segments with reserved openings during storage, transportation and assembly, and there is no need to pay special attention to and select them, which improves the efficiency of storage, transportation and assembly as a whole.

[0044] The waterproof connection layer 3 plays a good waterproof role, in which the waterproof mortar layer cooperates closely with the cast-in-place part 1 and can firmly bond and fix the waterproof rubber sheet layer upward. The prefabricated pipe segment assembly part 2 forms a good sealing cooperation relationship with the waterproof rubber sheet layer under the action of gravity. The overall structure is firm and the waterproof efficiency is good.

[0045] The L-shaped steel plate 4 can firmly connect the cast-in-place part 1 and the prefabricated pipe segment assembly part 2 at the step, and the inner steel plate 6 firmly connects the cast-in-place part 1 and the prefabricated pipe segment assembly part 2 on the outer wall of the caisson, so that the cast-in-place part 1 and the prefabricated pipe segment assembly part 2 are tightly combined and the structure is firm.

[0046] Among them, the waterproof mortar layer is preferably 2 cm thick.

[0047] The prefabricated pipe segment assembly part 2 includes a plurality of pipe segments assembled from prefabricated pipe segments 7;

[0048] Each layer of pipe section includes 6 arc-shaped prefabricated pipe segments 7, each prefabricated pipe segment 7 has a central angle of 60 degrees, and the 6 prefabricated pipe segments 7 are circumferentially spliced ​​to form a complete cylindrical caisson pipe section.

[0049] Each prefabricated pipe segment 7 has the same structure. In the same layer of pipe segments, the lateral end faces of two circumferentially adjacent prefabricated pipe segments 7 are same-layer connection end faces, and there is a same-layer end face waterproof connection structure between the two same-layer connection end faces.

[0050] Among two adjacent upper and lower pipe sections, the upper and lower end faces of two adjacent precast segments 7 are adjacent layer connection end faces, and there is an adjacent layer end face waterproof connection structure between the two adjacent layer connection end faces;

[0051] The same layer connection end face and the adjacent layer connection end face are collectively referred to as the connection end face. The connection end face includes an A-end face and a B-end face. The middle of the A-end face is recessed with a mating groove, and the middle of the B-end face is protruded with a protruding part that fits into the mating groove; in the figure, the protruding part and the mating groove occupy the same spatial position. Figure 5 The position indicated by reference numeral 8 in the figure, that is, the mating groove and the protruding part.

[0052] On the A-end face and the B-end face on both sides of the protruding part, water stop semi-holes are respectively provided corresponding to each other. Two water stop semi-holes corresponding to each other on the A-end face and the B-end face are combined to form two water stop holes, and water swelling water stop strips are respectively arranged in the two water stop holes. The water swelling water stop strip and the water stop hole occupy the same spatial position in the figure. Figure 5 Figure 6 The position indicated by reference numeral 9 in the figure, that is, the water swelling water stop strip and the water stop hole.

[0053] Chamfer structures are respectively provided at the inner and outer ends of the A-end face and the B-end face. The chamfer structures at the inner and outer ends of the A-end face and the B-end face respectively form an inner groove and an outer groove. An inner waterproof mortar structure is arranged in the inner groove, and an outer waterproof mortar structure is arranged in the outer groove. In the attached drawing, the inner groove and the inner waterproof mortar structure occupy the same spatial position and are referred to by reference numeral 10; the outer groove and the outer waterproof mortar structure occupy the same spatial position and are referred to by reference numeral 11.

[0054] The inner waterproof mortar structure and the outer waterproof mortar structure play a waterproof role at the inner and outer ends of the connection end face, and the two water swelling water stop strips and the protruding part play a waterproof role in the middle of the connection end face, forming a total of five waterproof structures, so that the waterproof performance of the present utility model basically reaches the waterproof performance of a caisson formed by full casting.

[0055] Each precast segment 7 has two lateral end faces 12, two upper and lower end faces 13, an outer wall surface and an inner wall surface. The lateral end faces 12 and the upper and lower end faces 13 are collectively referred to as end faces. Three arc-shaped bolt holes 14 are respectively and evenly provided on each end face of the precast segment 7, and each arc-shaped bolt hole 14 extends to the inner wall surface. An operation groove 15 for facilitating the operation of the arc-shaped bolt is recessed on the inner wall surface around the opening of each arc-shaped bolt hole 14;

[0056] Among the same layer of pipe sections, the arc-shaped bolt holes 14 between two circumferentially adjacent precast segments 7 correspond to each other, and the two circumferentially adjacent precast segments 7 are connected by arc-shaped bolts 16. The two ends of each arc-shaped bolt 16 are respectively located in the corresponding operation grooves 15 of the two circumferentially adjacent precast segments 7;

[0057] Among two adjacent upper and lower pipe sections, two adjacent precast segments 7 in the upper and lower positions are connected by arc-shaped bolts 16, and both ends of each arc-shaped bolt 16 are respectively located in the corresponding operation grooves 15 of the two adjacent precast segments 7 in the upper and lower positions.

[0058] In the present utility model, adjacent segments are all connected by three arc-shaped bolts 16, and the operation grooves 15 at both ends of each arc-shaped bolt 16 are all located on the inner wall surface of the caisson. In the caisson, all adjacent precast segments 7 can be connected by the arc-shaped bolts 16, which facilitates the connection operation between the precast segments 7 and improves the connection efficiency between the precast segments 7.

[0059] The present utility model also provides a construction method for the assembled composite caisson structure for the pipe jacking construction, which is carried out according to the following steps:

[0060] The first step is to construct the cast-in-place part 1 and simultaneously manufacture the precast segments 7;

[0061] The construction of the cast-in-place part 1 is as follows:

[0062] When the diameter of the reserved hole is less than or equal to 2 meters, the cast-in-place part 1 is integrally cast in one go;

[0063] When the diameter of the reserved hole is greater than 2 meters, the cast-in-place part 1 is concreted in two times from bottom to top. The first time is to pour to 50 centimeters below the reserved hole (including the cutting edge structure at the bottom end of the caisson), and the second time is to pour to 1 meter above the reserved hole. When concreting for the second time, the top surface of the cast-in-place part 1 is leveled and controlled to make the flatness deviation of the top surface of the cast-in-place part 1 less than or equal to 5 millimeters;

[0064] When manufacturing the precast segments 7, the height of a single precast segment 7 is 2 meters (each layer of pipe section is 2 meters high), and the thickness is 40 centimeters; the central angle of a single precast segment 7 is 60 degrees (6 precast segments 7 are circumferentially spliced to form one layer of pipe section);

[0065] After the first step is completed, the second step is carried out;

[0066] The second step is to sink the cast-in-place part 1; after sinking the cast-in-place part 1 until the top end of the cast-in-place part 1 is 50 centimeters below the ground surface, the third step is carried out;

[0067] The third step is to assemble the bottommost precast segments 7; the assembly of the precast segments 7 is carried out layer by layer, and every 6 precast segments 7 are assembled into one layer of pipe section;

[0068] The assembly of the bottommost precast segments 7 includes the waterproof operation on the cast-in-place top surface, the assembly operation, and the sinking operation;

[0069] The waterproof operation on the cast-in-place top surface is to apply waterproof mortar on the top surface of the cast-in-place part 1 to form a waterproof mortar layer (2 centimeters thick), and then bond an annular waterstop rubber sheet on the waterproof mortar layer;

[0070] The assembling operation is to assemble six precast segments 7 piece by piece above the cast-in-place part 1 to form the lowest layer of pipe joints. The arc-shaped bolt holes 14 of two circumferentially adjacent precast segments 7 correspond and communicate with each other one by one.

[0071] The assembling operation includes an alignment action and a circumferential bolt threading action.

[0072] The alignment action is as follows: First, place water-swelling water-stop strips at two mutually corresponding water-stop half-holes on the end faces of the A end and the B end, and then align the convex parts and mating grooves on the end faces of the A end and the B end and plug them together. The end faces of the A end and the B end in this step refer to the end faces of the A end and the B end of the same-layer connection end face.

[0073] The circumferential bolt threading action is: In the caisson, insert the arc-shaped bolts 16 into each operation groove 15, so that each arc-shaped bolt 16 passes through the arc-shaped bolt holes 14 of two adjacent precast segments 7, and the two ends of each arc-shaped bolt 16 are respectively located in the corresponding operation grooves 15 of two circumferentially adjacent precast segments 7. Screw matching nuts at both ends of each arc-shaped bolt 16 and tighten them.

[0074] The sinking operation means that after assembling one layer of pipe joints, the cast-in-place part 1 and the assembled pipe joints are integrally sunk, and the sinking stops when the top end of the uppermost pipe joint is 0.5 meters below the ground surface.

[0075] The fourth step is the assembling operation of each layer of pipe joints except the bottom layer of pipe joints; it includes waterproofing operation between pipe joints, assembling operation and sinking operation.

[0076] The waterproofing operation between pipe joints is to embed water-swelling water-stop strips in the water-stop half-holes at the top end of the relatively lower layer of pipe joints before the assembling operation. After the assembling operation in this step, apply waterproof mortar at the inner groove and the outer groove respectively to form an outer waterproof mortar structure and an inner waterproof mortar structure.

[0077] The assembling operation in this step is based on the assembling operation in the third step, and adds the threading action and insertion action of the upper and lower arc-shaped bolts 16.

[0078] The threading action of the upper and lower arc-shaped bolts 16 is to insert the arc-shaped bolts 16 into the corresponding arc-shaped bolt holes 14 of two adjacent upper and lower precast segments 7 in the caisson, and make the two ends of the corresponding arc-shaped bolts 16 be respectively located in the corresponding operation grooves 15 of two adjacent upper and lower precast segments 7. Screw matching nuts at both ends of each arc-shaped bolt 16 and tighten them.

[0079] The alignment action in this step includes the end faces of the A end and the B end of the same-layer connection end face, as well as the end faces of the A end and the B end of the adjacent-layer connection end face.

[0080] The sinking operation in this step is the same as the sinking operation in the third step.

[0081] Execute the fourth step in a loop until the caisson sinks to the designed depth, and ensure that the top end of the uppermost pipe section is more than 1.2 meters above the ground, and then proceed to the fifth step;

[0082] The fifth step is the caisson bottom sealing operation, where concrete is poured at the bottom of the caisson to seal the bottom of the caisson;

[0083] The sixth step is to backfill the well chamber. Earthwork is backfilled in the inner cavity of the caisson to improve the stability and bearing capacity of the caisson; after backfilling to 50 cm above the bottom end of the uppermost pipe section, remove the precast segments 7 of the uppermost pipe section and use them for the construction of the next caisson, and then continue to backfill the well chamber to the designed elevation position to complete all construction operations.

[0084] The construction method in the present utility model coordinates the construction of the cast-in-place part 1 and the precast segment 7 assembly part 2. Various operations are simple and easy to perform, the construction efficiency is relatively high, the waterproofing between the precast segments 7 is tight, the amount of construction waste generated is less, and the pressure of environmental protection treatment is smaller.

[0085] Adjacent precast segments 7 are all connected by three arc-shaped bolts 16. The arc-shaped bolts 16 not only play a role in connecting the precast segments 7, but also play a role in ensuring tight waterproofing. By tightening the arc-shaped bolts 16, the water-swelling waterstop strips between adjacent precast segments 7 can be pressed tightly, and it is ensured that the convex part and the mating groove are inserted tightly.

[0086] When performing the bottom sealing operation, the top end of the uppermost pipe section is more than 1.2 meters above the ground, playing a dual role of temporary protection and water retaining wall.

[0087] During the operation of threading the bolt, the operation of tightening the nut is divided into initial tightening and final tightening;

[0088] Before all 6 precast segments 7 of a layer of pipe sections are completely assembled, after connecting the arc-shaped bolts 16 between adjacent two precast segments 7, perform initial tightening on the arc-shaped bolts 16 to make the mating surfaces between the circumferentially adjacent and vertically adjacent two precast segments 7 form a close contact state; after all 6 precast segments 7 of the same layer of pipe sections are completely assembled, perform final tightening on each arc-shaped bolt 16 to correct the roundness deviation of this layer of pipe sections, and ensure that the roundness deviation is less than or equal to 0.5% (that is, the maximum deviation between the circular contour of this layer of pipe sections and the ideal circle does not exceed 0.5% of the diameter).

[0089] Tighten the nut twice for initial tightening and final tightening. Through initial tightening, the connection end faces between adjacent two precast segments 7 are closely fitted, and through final tightening, the roundness deviation of the entire layer of pipe sections is corrected, which can significantly improve the construction quality.

[0090] After the circumferential bolt insertion operation and the insertion operation of the upper and lower arc-shaped bolts 16, a plugging operation is performed on the operation grooves 15 at both ends of the arc-shaped bolts 16; the plugging operation is to fill the operation grooves 15 at both ends of the arc-shaped bolts 16 with waterproof mortar, and the waterproof mortar in the operation grooves 15 serves three functions: waterproofing, surface leveling, and preventing the arc-shaped bolts 16 and nuts from loosening.

[0091] The waterproof mortar in the operation grooves 15 serves three functions: surface leveling and preventing the arc-shaped bolts 16 and nuts from loosening. One structure with three functions can ensure that the arc-shaped bolts 16 and nuts will not loosen during the long-term use of the caisson structure, and water will not enter the holes 14 of the arc-shaped bolts 16, ensuring the structural firmness of the caisson structure during long-term use.

[0092] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be modified or equivalently replaced, and any modification or partial replacement without departing from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. An assembled composite caisson structure for pipe jacking construction, wherein the side wall of the caisson has a reserved hole for communicating with the underground pipeline, with the direction pointing to the center line of the caisson being inward and the direction opposite being outward; characterized in that: Including cast-in-place part and prefabricated segment assembly part; The top of the cast-in-place part is 1 meter higher than the reserved opening, the inner wall surface of the cast-in-place part is aligned with the inner wall surface of the prefabricated segment assembly part, and the wall thickness of the cast-in-place part is greater than the wall thickness of the prefabricated segment assembly part, so that a step is formed between the top of the cast-in-place part and the outer wall surface of the prefabricated segment assembly part; A waterproof mortar layer and a waterproof rubber sheet layer are provided between the top of the cast-in-place part and the bottom of the prefabricated segment assembly part; the waterproof mortar layer and the waterproof rubber sheet layer are collectively referred to as a waterproof connection layer; An L-shaped steel plate is provided at the step, the vertical plate of the L-shaped steel plate is connected to the bottom of the prefabricated segment assembly part by chemical bolts, and the horizontal plate of the L-shaped steel plate is connected to the top of the cast-in-place part by chemical bolts; An inner steel plate is provided at the inner end of the waterproof connection layer, the upper part of the inner steel plate is connected to the bottom of the prefabricated pipe segment assembly part through chemical bolts, and the lower part of the inner steel plate is connected to the top of the cast-in-place part through chemical bolts.

2. The assembled composite caisson structure for pipe jacking construction according to claim 1 is characterized in that: The prefabricated pipe segment assembly part includes several layers of pipe segments assembled from prefabricated pipe segments; Each layer of pipe segment consists of 6 arc-shaped prefabricated segments, and the central angle of each prefabricated segment is 60 degrees; Each prefabricated pipe segment has the same structure. In the same layer of pipe segments, the lateral end faces of two circumferentially adjacent prefabricated pipe segments are same-layer connection end faces, and there is a same-layer end face waterproof connection structure between the two same-layer connection end faces. In the two adjacent layers of pipe sections, the upper and lower end surfaces of the two adjacent prefabricated pipe segments are adjacent layer connection end surfaces, and an adjacent layer end surface waterproof connection structure is provided between the two adjacent layer connection end surfaces; The same-layer connection end face and the adjacent-layer connection end face are collectively referred to as connection end faces, and the connection end faces include an A-end end face and a B-end end face, the A-end end face has a concave middle portion with a matching groove, and the B-end end face has a convex middle portion with a convex portion embedded in the matching groove; The A end face and the B end face on both sides of the raised part are respectively provided with water-stop half holes, and the two corresponding water-stop half holes on the A end face and the B end face are spliced ​​to form two water-stop holes, and water-expanding water-stop strips are respectively provided in the two water-stop holes.

3. The assembled composite caisson structure for pipe jacking construction according to claim 2 is characterized in that: The inner and outer ends of the A end face and the B end face are respectively provided with chamfer structures, and the chamfer structures of the inner and outer ends of the A end face and the B end face respectively constitute an inner groove and an outer groove, the inner groove is provided with an inner waterproof mortar structure, and the outer groove is provided with an outer waterproof mortar structure.

4. The assembled composite caisson structure for pipe jacking construction according to claim 2 is characterized in that: Each prefabricated pipe segment has two lateral end faces, two upper and lower end faces, an outer wall face and an inner wall face. The lateral end faces and the upper and lower end faces are collectively referred to as end faces. Each end face of the prefabricated pipe segment is evenly provided with three arc-shaped bolt holes, each arc-shaped bolt hole extends to the inner wall face, and an operating groove for convenient operation of the arc-shaped bolts is provided on the inner wall face around the opening of each arc-shaped bolt hole. In the same layer of pipe segments, the arc-shaped bolt holes between two circumferentially adjacent prefabricated segments correspond to each other, and the two circumferentially adjacent prefabricated segments are connected by arc-shaped bolts, and the two ends of each arc-shaped bolt are respectively located in the corresponding working grooves of the two circumferentially adjacent prefabricated segments; In two layers of pipe sections adjacent to each other, two adjacent prefabricated pipe segments are connected by arc bolts, and two ends of each arc bolt are respectively located in the corresponding working grooves of the two adjacent prefabricated pipe segments.

Images