Prefabricated reinforced concrete pipe-jacking open caisson structure

Abstract

The utility model provides a prefabricated assembly type reinforced concrete pipe jacking open caisson structure which comprises a plurality of open caisson wall standard knots, the vertically adjacent open caisson wall standard knots are connected in a clamping mode, each open caisson wall standard knot comprises an end concrete module and a middle concrete module, the end concrete module is of a U-shaped structure, and the middle concrete module is of a U-shaped structure. Two middle concrete modules are arranged between the two end concrete modules in parallel in the horizontal direction, concave tooth tenons are arranged at the ends, close to each other, of the end concrete modules and the middle concrete modules correspondingly, and first water stop steel plates are embedded into the middles of the concave tooth tenons correspondingly. Reserved buckle steel bar assemblies are arranged on the peripheries of the ends, close to each other, of the end concrete modules and the middle concrete modules, stirrup assemblies are arranged between the adjacent reserved buckle steel bar assemblies, and concrete areas are arranged in gaps between the end concrete modules and the middle concrete modules. The novel assembly type connection node design is adopted, the assembly node structure is reasonable, and the stress performance is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated concrete structures, in particular to a prefabricated assembled reinforced concrete pipe jacking caisson structure. Background Technique

[0002] The large-area excavation construction for implementing new or reconstructed pipelines will inevitably have a greater impact on traffic. The currently widely used trenchless pipe jacking construction technology usually sinks a reinforced concrete working caisson at a certain distance along the pipeline laying route, and the pipeline is laid in place through the pipe jacking construction method between the caissons. The reinforced concrete working caisson usually adopts the caisson construction method of one-time casting and one-time sinking on-site or sectional casting and multiple sinkings. This construction method has a long construction time on the road site, has a greater impact on the surrounding traffic and environment, and does not meet the requirements of green construction.

[0003] The prefabricated assembled structure has the advantages of industrial production, fast, efficient, and environmentally friendly on-site assembly, and less requirements for the number of construction workers. Using a prefabricated working caisson for pipe jacking construction of underground pipelines can effectively improve the construction efficiency at the pipe jacking project site, reduce the impact of construction on the surrounding road traffic and environmental pollution, and create greater social, environmental, and economic benefits.

[0004] The pipe jacking caisson usually also serves as a permanent inspection well or a water treatment structure, and has high requirements for the anti-seepage performance of the well body. However, due to its modular assembly construction technology and the construction technology of the caisson itself, the prefabricated caisson cannot adopt waterproof measures such as externally pasting waterproof coiled materials. Compared with the traditional integral cast-in-place reinforced concrete caisson, how to ensure the anti-seepage reliability at the connection construction joint has always been an important problem faced in its development. At present, there are mainly the following two problems in the assembly of the traditional cast-in-place reinforced concrete caisson structure: 1. The connection nodes of the existing prefabricated caisson structure are relatively primitive, mostly simple dovetail connections, which are difficult to form an effective force transmission path and are prone to dislocation and cracking; 2. The anti-seepage reliability of the splicing node is poor, and leakage is extremely likely to occur during the long-term use of water storage structures in municipal engineering. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the utility model provides a prefabricated assembled reinforced concrete pipe jacking caisson structure to solve the problems in the prior art, such as long construction period, large impact on traffic and environment, and high construction cost, caused by using the traditional cast-in-place reinforced concrete caisson.

[0006] The technical solution adopted by the utility model is:

[0007] A prefabricated assembled reinforced concrete pipe-jacking caisson structure, which comprises a plurality of standard sections of the caisson wall arranged in sequence from top to bottom, wherein the vertically adjacent standard sections of the caisson wall are connected by snap-fitting, and each standard section of the caisson wall comprises an end concrete module and a middle concrete module, wherein the end concrete module structure is a U-shaped structure, and two middle concrete modules are arranged in parallel in the horizontal direction between the two end concrete modules, and the ends of the end concrete modules and the middle concrete modules close to each other are provided with concave tenons, and the middle parts of the outer circumferences of the concave tenons are pre-embedded with a first waterstop steel plate, and the outer circumferences of the ends of the end concrete modules and the middle concrete modules close to each other are provided with reserved ring buckle steel bar assemblies, and annular stirrups and vertical assemblies are arranged between adjacent reserved ring buckle steel bar assemblies, and a concrete area is arranged in the gap between the end concrete modules and the middle concrete modules.

[0008] Preferably, in the prefabricated and assembled reinforced concrete jacking pipe caisson structure, the reserved ring buckle steel bar assembly comprises a plurality of reserved ring buckle steel bars spaced apart in the vertical direction of the concave tenon.

[0009] Preferably, the prefabricated assembled reinforced concrete pipe-jacking caisson structure, wherein: the stirrup assembly includes a plurality of annular stirrups and vertical steel bars, each annular stirrup is placed between two reserved ring-buckle steel bars at the same position, and is fixed in position by the vertical steel bars to form a steel skeleton of the concrete area.

[0010] Preferably, the prefabricated and assembled reinforced concrete jacking pipe caisson structure, wherein: the vertically adjacent standard sections of the caisson wall, the end concrete modules and the middle concrete modules located in the lower layer, have grouting grooves, grouting holes and connecting steel bars on the top surfaces, the end concrete modules and the middle concrete modules located in the upper layer have second waterstop steel plates and steel bar connecting grouting sleeves on the bottom surfaces, the second waterstop steel plates and the grouting grooves are fitted and clamped, and the connecting steel bars and the steel bar connecting grouting sleeves are fitted and clamped.

[0011] Preferably, in the prefabricated and assembled reinforced concrete jacking pipe caisson structure, a grouting groove is provided in the middle of the top surface of the end concrete module and the middle concrete module along the length direction.

[0012] Preferably, in the prefabricated assembled reinforced concrete jacking pipe caisson structure, a plurality of grouting holes are provided on the side surfaces of the end concrete modules and the middle concrete modules along the length direction, the grouting holes are equidistantly distributed, and the grouting holes are connected to the grouting grooves.

[0013] Advantages of the utility model:

[0014] The prefabricated assembled reinforced concrete pipe jacking caisson structure of the present utility model adopts a new type of assembled connection node design compared with the traditional cast-in-situ reinforced concrete caisson structure. The assembled node structure is reasonable and the mechanical performance is reliable, solving the problems of long construction period and large traffic impact of the existing traditional cast-in-situ reinforced concrete pipe jacking caisson, as well as the weak joint structure of the assembled concrete pipe jacking caisson and easy leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the end concrete module and the middle concrete module of the present utility model.

[0016] Figure 2 It is a schematic structural diagram of the circumferential stirrup assembly of the present utility model.

[0017] Figure 3 It is a schematic structural diagram of the end concrete module and the middle concrete module of the present utility model before assembly.

[0018] Figure 4 It is a schematic structural diagram of the reserved ring buckle steel bar assembly and the circumferential stirrup assembly of the present utility model after assembly.

[0019] Figure 5 It is a schematic structural diagram of the end concrete module and the middle concrete module of the present utility model after assembly.

[0020] Figure 6 It is a schematic structural diagram of the structure of two adjacent caissons of the present utility model before assembly.

[0021] Figure 7 It is a schematic structural diagram of the structure of two adjacent caissons of the present utility model after assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below in conjunction with the specific drawings and embodiments.

[0023] As Figure 1-7A prefabricated assembled reinforced concrete pipe-jacking caisson structure, which includes: a plurality of standard sections of caisson wall arranged in sequence from top to bottom, vertically adjacent standard sections of caisson wall are connected by snap-fitting, each standard section of caisson wall includes an end concrete module 1 and a middle concrete module 2, the end concrete module 1 structure is a U-shaped structure, two middle concrete modules 2 are arranged in parallel in the horizontal direction between the two end concrete modules 1, the ends of the end concrete module 1 and the middle concrete module 2 close to each other are provided with concave tenons 3, the middle part of the outer periphery of the concave tenons 3 is pre-embedded with a first waterstop steel plate 5, the outer periphery of the end concrete module 1 and the middle concrete module 2 close to each other is provided with a reserved ring buckle steel bar assembly, a stirrup assembly is arranged between adjacent reserved ring buckle steel bar assemblies, and a concrete area 7 is arranged in the gap between the end concrete module 1 and the middle concrete module 2.

[0024] The reserved ring-buckle steel bar assembly includes a plurality of reserved ring-buckle steel bars 4 arranged at intervals in the vertical direction along the concave tenon 3; the annular stirrup assembly includes a plurality of annular stirrups 6 and vertical steel bars 13, each annular stirrup 6 is placed between two reserved ring-buckle steel bars 4 at the same position, and is fixed in position by the vertical steel bars 13 to form a steel skeleton of the concrete area.

[0025] The standard sections of the caisson walls that are vertically adjacent include the end concrete module 1 and the middle concrete module 2 located at the lower layer, and the top surfaces thereof are provided with grouting grooves 8, grouting holes 9 and connecting steel bars 10. The end concrete module 1 and the middle concrete module 2 located at the upper layer have the second waterstop steel plate 12 and the steel bar connecting grouting sleeve 11 arranged on the bottom surfaces. When the caisson is vertically spliced, the second waterstop steel plate 12 and the grouting grooves 8 are engaged and clamped, and the connecting steel bars 10 and the steel bar connecting grouting sleeve 11 are engaged and clamped.

[0026] A grouting groove 8 is arranged in the middle of the top surface of the end concrete module 1 and the middle concrete module 2 along the length direction; a plurality of grouting holes 9 are arranged on the side surfaces of the end concrete module 1 and the middle concrete module 2 along the length direction, the grouting holes 9 are evenly distributed, and the grouting holes 9 are connected to the grouting groove 8.

[0027] The end concrete module 1 and the middle concrete module 2 are horizontally spliced by reserving loop steel bars 4 on the side of the module and then casting concrete. The vertical splicing is connected by inserting the embedded steel bar sleeves 11 at the bottom of the upper end concrete module 1 and the middle concrete module 2 into the connecting steel bars 10 reserved on the top of the lower end concrete module 1 and the middle concrete module 2 and then grouting.

[0028] The preparation process of the utility model is as follows:

[0029] Step S1. The end concrete module 1 and the middle concrete module 2 are horizontally spliced in the following manner: Figure 2-5As shown in the figure, during on-site assembly and installation, the reserved looped bar 4 is arranged in alignment, inserted into the additional vertical bar 13 and the circumferential stirrup 6, and then the concrete 7 in the assembled joint area is cast in situ.

[0030] Step S2. The vertical splicing method of the precast modules is as Figure 6-7 As shown in the figure, at the top surface of the vertical connection position between the end concrete module 1 and the middle concrete module 2, a grouting groove 8, a grouting hole 9 and a connecting bar 10 are reserved, and a second water stop steel plate 12 and a bar connection grouting sleeve 11 are embedded at the bottom surface; during on-site installation, the upper-section precast well module is hoisted and installed on the top of the lower-section precast well module. The vertical bar 10 reserved at the top of the module is inserted into the grouting sleeve 11 embedded at the bottom of the upper-section module, the second water stop steel plate 12 is clamped into the grouting groove 8 at the top of the lower-section module, and the grouting groove 8 is filled with grouting material through the reserved grouting hole 9.

[0031] In actual construction cases, the number of vertical segments of the required precast concrete modules needs to be determined according to the excavation depth required for the actual pipe jacking construction. After the precast concrete modules are produced in the factory and transported to the construction site, through the assembled installation process, the reinforced concrete pipe jacking well structure can be quickly constructed, and subsequent construction can be carried out.

[0032] The water stop steel plates and grouting grooves provided on the side and bottom of the module are used to enhance the anti-seepage performance of the splicing joint, and can effectively solve the problem that the splicing joints of the existing assembled water storage structures are prone to leakage. In a further implementation case, an additional inner wall anti-seepage coating layer can also be adopted after the assembled well sinking and assembly construction is completed to further enhance the overall anti-seepage performance.

[0033] The precast assembled reinforced concrete pipe jacking well structure of the present utility model adopts a new type of assembled connection joint design compared with the traditional cast-in-situ reinforced concrete well structure. The splicing joint structure is reasonable and the mechanical properties are reliable, solving the problems of long construction period and large traffic impact of the existing traditional cast-in-situ reinforced concrete pipe jacking well, and the weak splicing joint structure and easy leakage of the assembled concrete pipe jacking well.

[0034] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present utility model rather than to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A prefabricated assembled reinforced concrete pipe jacking caisson structure, characterized in that: It includes a plurality of standard segments of the caisson wall arranged successively from top to bottom. The vertically adjacent standard segments of the caisson wall are connected by snap connection. Each standard segment of the caisson wall includes an end concrete module (1) and a middle concrete module (2). The structure of the end concrete module (1) is a U-shaped structure. Two middle concrete modules (2) are arranged in parallel in the horizontal direction between the two end concrete modules (1). Concave tenons (3) are provided at the mutually adjacent ends of the end concrete module (1) and the middle concrete module (2). The middle part of the outer periphery of the concave tenon (3) is pre-embedded with a first water-stop steel plate (5). A reserved ring-bar assembly is provided on the outer periphery of the mutually adjacent ends of the end concrete module (1) and the middle concrete module (2). A stirrup assembly is provided between the adjacent reserved ring-bar assemblies. A concrete area (7) is provided in the gap between the end concrete module (1) and the middle concrete module (2).

2. The prefabricated assembled reinforced concrete pipe jacking caisson structure according to claim 1, wherein: The reserved ring-bar assembly includes a plurality of reserved ring-bars (4) arranged at intervals along the vertical direction of the concave tenon (3).

3. The prefabricated and assembled reinforced concrete pipe jacking caisson structure according to claim 1, characterized in that: The stirrup assembly includes a plurality of circumferential stirrups (6) and vertical bars (13). Each circumferential stirrup (6) is placed between two reserved ring-bars (4) at the same position and is fixed in position by the vertical bars (13) to form the steel bar framework of the concrete area (7).

4. The prefabricated assembled reinforced concrete jacking pipe caisson structure according to claim 1, characterized in that: For the vertically adjacent standard segments of the caisson wall, on the top surface of the end concrete module (1) and the middle concrete module (2) in the lower layer, a grouting groove (8), a grouting hole (9) and a connecting bar (10) are provided. On the bottom surface of the end concrete module (1) and the middle concrete module (2) in the upper layer, a second water-stop steel plate (12) and a steel bar connecting grouting sleeve (11) are provided. The second water-stop steel plate (12) and the grouting groove (8) are fitted and snapped. The connecting bar (10) and the steel bar connecting grouting sleeve (11) are fitted and snapped.

5. The prefabricated and assembled reinforced concrete pipe jacking caisson structure according to claim 4, characterized in that: A grouting groove (8) is arranged along the length direction in the middle of the top surface of the end concrete module (1) and the middle concrete module (2).

6. The prefabricated assembled reinforced concrete pipe jacking caisson structure according to claim 5, characterized in that: A plurality of grouting holes (9) are provided along the length direction on the side surface of the end concrete module (1) and the middle concrete module (2). The grouting holes (9) are equally spaced and the grouting holes (9) communicate with the grouting groove (8).

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