Large-depth H-shaped underground anti-impact wall and construction technology thereof

Abstract

The invention belongs to the technical field of hydraulic engineering construction, and relates to a large-depth H-shaped underground anti-impact wall which is composed of a plurality of H-shaped unit grooves, each H-shaped unit groove comprises a T-shaped wall body, a reinforcement cage and a connector assembly, the two T-shaped wall bodies are connected through the connector assemblies, and the reinforcement cages are arranged in the two T-shaped wall bodies. The invention further relates to a construction technology of the large-depth H-shaped underground anti-impact wall, the two T-shaped wall bodies are formed in sequence in the technology, the two T-shaped wall bodies are connected through the connector assembly, the construction difficulty of steel bar connection and concrete pouring is remarkably reduced through the connection mode, and the problem that steel bar connection in a large-depth narrow space is difficult to achieve is solved; and meanwhile, the problem of cold joints is solved, and the construction quality is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy project construction, and relates to an underground anti-scouring wall and a construction process thereof, in particular to a large-depth H-shaped underground anti-scouring wall and a construction process thereof. Background Art

[0002] Underground anti-scouring walls are concrete structures used to reinforce river embankments to prevent the embankment foundation from being eroded by the large flow and fast flow of river water during floods, which in turn causes the risk of embankment breach. The underground anti-scouring wall uses the underground continuous wall construction process. The wall is connected by multiple ground-connected walls to form a single-row structure. The conventional connection joints are flexible joints and rigid joints. Flexible joints include: circular locking pipe joints, corrugated pipe joints, wedge joints, I-beam joints, and precast concrete joints; rigid joints include straight or cross-shaped perforated steel plate joints and steel bar socket joints.

[0003] According to the comprehensive consideration of factors such as hydrology, geology, working conditions and calculation verification, a single row of anti-collision wall structure cannot meet the engineering requirements. Therefore, the H-type underground anti-collision wall structure was invented. The H-type underground anti-collision wall is composed of several H-type unit slots, and each H-type unit slot is composed of two longitudinal walls and one transverse wall (hereinafter referred to as the transverse partition wall).

[0004] The specific construction steps of the existing H-type underground anti-collision wall are: 1. Carry out construction preparation work, that is, site clearing and leveling; 2. According to the design requirements and measurement and layout of the longitudinal walls on both sides of the underground anti-collision wall, carry out guide wall excavation, steel bar binding, formwork support, concrete pouring and maintenance construction; 3. Prepare the mud used for wall foundation trench protection and the steel cage required for making the wall; 4. Put the trenching machine equipment in place and excavate the wall foundation trench; 5. Lower the steel cage and concrete pouring of the longitudinal walls on both sides to complete the construction of the longitudinal walls on both sides; 6. After the concrete strength of the longitudinal walls on both sides meets the design requirements, excavate the foundation pit between the longitudinal walls on both sides to prepare for the dry construction of the middle horizontal partition wall in the foundation pit. According to the requirements of the specifications, layered excavation and support are required; 7. Excavation, support, precipitation and safety monitoring during the construction period are carried out simultaneously to ensure the overall safety of the foundation pit structure; 8. When the foundation pit is excavated to the bottom elevation of the transverse partition wall and the conditions for dry construction are met, the steel bars of the inner walls of the longitudinal walls on both sides are embedded and connected and tied with the transverse partition wall steel bars, the transverse partition wall formwork is supported, and concrete is poured to complete the structural construction of the underground anti-collision wall.

[0005] The above construction method has the following problems:

[0006] 1. This construction method is to first construct the longitudinal walls on both sides, and then construct the middle transverse partition wall after the longitudinal walls on both sides are formed and their concrete strength meets the process requirements. The longitudinal walls and transverse partition walls are poured separately. Due to the different pouring times, cold joints are easily generated, which affects the quality of the overall underground anti-collision wall in the later stage;

[0007] 2. To ensure the overall strength, rigidity and stability of the H-shaped underground anti-collision wall structure, the steel bars and concrete of the transverse partition wall must be effectively connected to the longitudinal walls on both sides. Based on the above process connection, high requirements are put forward for the guide wall construction, trench excavation, steel bar connection, concrete pouring, etc., which poses a great challenge to the construction quality, safety and construction period. In addition, this process is difficult to achieve steel bar connection in a deep and narrow space;

[0008] 3. Especially for the construction of deep H-shaped underground anti-collision walls, due to the large excavation depth required, the construction preparation takes a long time, the equipment invested (such as excavators, cranes, muck trucks, precipitation equipment, generators and safety monitoring instruments, etc.) is large, and the construction process is cumbersome, which is not conducive to progress and cost control;

[0009] Deep foundation pit excavation is a relatively dangerous project that exceeds a certain scale. The construction will disturb the surrounding soil, and the construction risk is high. Support and enclosure structures need to be set up. Workers working in deep foundation pits increase the construction safety risks.

[0010] The huge amount of earth excavation is not conducive to soil and water conservation and environmental protection control, and it is difficult to achieve high-quality, efficient and green management goals.

[0011] In view of this, it is very necessary for this industry to design a construction process for H-type underground impact wall cross partition wall plug-in joints that can avoid the safety and environmental risks of deep foundation pit excavation, reduce equipment investment, reduce the difficulty of construction processes, improve construction efficiency and quality control, and has wide versatility. Summary of the invention

[0012] The purpose of the present invention is to provide a large-depth H-shaped underground anti-collision wall and its construction process to solve the technical problems mentioned in the above background technology.

[0013] The present invention solves the technical problem by the following technical solutions:

[0014] A deep H-shaped underground anti-collision wall is composed of a plurality of H-shaped unit grooves, characterized in that: the H-shaped unit groove includes a T-shaped wall, a steel cage and a joint assembly, the T-shaped wall includes a vertical longitudinal wall and a transverse wall vertically arranged in the middle of the upper half of the longitudinal wall, two T-shaped walls are arranged opposite to each other on the left and right, and the two transverse walls are connected to form a transverse partition wall through a joint assembly, the T-shaped wall is a cast-in-one structure, and steel cages are arranged in the two T-shaped walls.

[0015] Moreover, the steel cage includes bent horizontal steel bars and longitudinal steel bars. The bent horizontal steel bars are evenly spaced in the vertical direction, and each bent horizontal steel bar is connected by the longitudinal steel bars evenly spaced in the vertical direction; the bent horizontal steel bars are composed of a front horizontal portion, a fold line portion, a middle horizontal portion, a rear horizontal portion, a front vertical portion and a rear vertical portion, the rear horizontal portions are vertically bent forward at both ends of the rear vertical portion, the front vertical portions are vertically bent inward at the roots of the two rear horizontal portions, the middle horizontal portions are vertically bent forward at the roots of the two front vertical portions, the fold line portions inclined inward are bent forward at the front ends of the two middle horizontal portions, and the front horizontal portions are horizontally bent horizontally at the front ends of the two fold line portions.

[0016] Moreover, the joint assembly includes an I-beam and a connecting mesh. Connecting meshes are symmetrically welded at both ends of the outer side of each flange plate of the I-beam. The connecting mesh is welded by steel bars arranged in a staggered manner horizontally and vertically. The height of the I-beam is the same as the height of the cross partition wall. The two front horizontal parts of the bent horizontal steel bars are inserted between the two relatively arranged connecting meshes, and the ends of the two front horizontal parts of the bent horizontal steel bars are abutted against the web of the I-beam.

[0017] Moreover, the lap length between the transverse reinforcement on the connecting mesh and the I-beam flange plate is 5 times the diameter of the reinforcement.

[0018] Moreover, the transverse length of the rectangular joint box is greater than 35 times the diameter of the steel bar.

[0019] A construction process for a large-depth H-shaped underground anti-collision wall, characterized in that it comprises the following steps:

[0020] S1: Complete the site clearing and leveling process within the construction area;

[0021] S2: According to the design requirements and measurement and layout of the underground anti-collision wall, complete the guide wall excavation, steel bar binding, formwork support, concrete pouring and maintenance procedures;

[0022] S3: Complete the installation of the trenching machine, the mud pool and the steel cage processing yard in the construction area;

[0023] S4: using a trenching machine to complete the excavation of the first trench section and the excavation boundary line between the first trench section and the second trench section in the construction area;

[0024] S5: Complete the installation of the steel cage in the first constructed trench section;

[0025] S6: lowering an I-beam welded with a connecting mesh at a position where the first constructed trench section and the second constructed trench section are butted against each other;

[0026] S7: lower a rectangular joint box into a slot formed by an I-beam and a connecting mesh on one side of the rear construction slot section, and fill the rectangular joint box and the rear construction slot section with sand bags to prevent the I-beam and the rectangular joint box from displacement and tilting;

[0027] S8: pouring concrete into the first constructed trench section;

[0028] S9: When the concrete in the first construction trench section meets the process requirements, the later construction trench section on the other side of the excavation boundary line is excavated, and the sand bags are dug out during the excavation. After the excavation is completed, the rectangular joint box is taken out, and after the completion, the steel cage in the construction trench section is lowered and installed and the concrete is poured;

[0029] When the concrete in the later construction trench section meets the process requirements, the forming construction of the deep H-shaped underground anti-collision wall unit trench is completed;

[0030] S10: Repeat steps 1-9 to complete the construction of several H-shaped unit grooves, thereby completing the construction of the entire large-depth H-shaped underground anti-collision wall.

[0031] The advantages and beneficial effects of the present invention are:

[0032] 1. This deep H-shaped underground anti-collision wall and its construction process, by designing the process of step-by-step construction of the longitudinal wall and the transverse partition wall in the existing technology into a process of successively constructing two T-shaped walls, and the two T-shaped walls are connected by a joint assembly, avoiding the cold joint problem caused by the sequential pouring of the longitudinal wall and the transverse partition wall, and ensuring the quality of the overall underground anti-collision wall in the later stage.

[0033] 2. In this deep H-shaped underground anti-collision wall and its construction process, the first construction slot section and the second construction slot section are connected by a joint assembly. The joint assembly is pre-buried before pouring concrete, and has good integrity with the concrete after pouring, which prolongs the service life of the underground anti-collision wall. At the same time, this connection method significantly reduces the construction difficulty of steel bar connection and concrete pouring, solves the problem of steel bar connection in a narrow space, and ensures the construction quality.

[0034] 3. During the construction of this deep H-shaped underground anti-collision wall and its construction process, only trenching machines are needed for excavation, which greatly reduces the workload of foundation pit excavation, foundation pit support and drainage construction between the longitudinal walls on both sides of the underground anti-collision wall (due to the proximity to the river, water will seep out during excavation, so water stop protection and drainage construction are required), and the working efficiency of the underground anti-collision wall unit trench is increased by 4-5 times;

[0035] At the same time, it reduces the safety and environmental risks caused by deep foundation pit excavation, reduces the disturbance to the surrounding soil, eliminates the need to set up foundation pit supports, requires less equipment, and saves construction costs. It avoids the risks of dust and soil erosion caused by earth excavation, which is conducive to improving the overall level of green and low-carbon construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic plan view of an H-shaped underground anti-collision wall unit groove of the present invention;

[0037] Figure 2 The H-type underground anti-collision wall facade of the present invention ( Figure 1 AA direction) schematic diagram;

[0038] Figure 3 It is a schematic plan view of the excavation of the foundation trench of the first construction trench section and the installation of the steel cage in the transverse partition wall area of ​​the present invention;

[0039] Figure 4 It is a schematic plan view of the I-beam and the welded connecting mesh in the transverse partition wall area of ​​the present invention;

[0040] Figure 5 It is a schematic plan view of installing a rectangular joint box and filling sand bags in the rear construction trench section area in the transverse partition wall area of ​​the present invention;

[0041] Figure 6 It is a schematic plan view of first pouring concrete in the trench section, then excavating the trench section (including excavating sand bags) and pulling out the rectangular joint box in the transverse partition wall area of ​​the present invention;

[0042] Figure 7 It is a schematic plan view of installing a steel cage and pouring concrete in the rear construction slot section in the transverse partition wall area of ​​the present invention;

[0043] Figure 8 It is a schematic structural diagram of the steel cage of the present invention.

[0044] Description of reference numerals:

[0045] 1-H-type unit trench, 2-first construction trench section, 3-latter construction trench section, 4-longitudinal wall, 5-transverse partition wall, 6-I-beam, 7-transverse reinforcement, 8-longitudinal reinforcement, 9-rectangular joint box, 10-excavation boundary line, 11-sandbag, 12-connecting mesh, 13-rebar cage, 14-front section horizontal part, 15-fold line part, 16-middle section horizontal part, 17-front section vertical part, 18-rear section horizontal part, 19-rear section vertical part. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0047] A large-depth H-shaped underground anti-collision wall is composed of a plurality of H-shaped unit grooves 1, and its innovation lies in: Figure 1 and Figure 2 As shown, the H-shaped unit groove includes a T-shaped wall, a steel cage 13 and a joint assembly. The T-shaped wall includes a vertical longitudinal wall 4 and a transverse wall vertically arranged in the middle of the upper half of the longitudinal wall. The two T-shaped walls are arranged opposite to each other on the left and right, and the two transverse walls are connected to form a transverse partition wall 5 through a joint assembly. The T-shaped wall is a cast-in-one structure, and steel cages are arranged in the two T-shaped walls.

[0048] like Figure 8 As shown, the steel cage includes bent horizontal steel bars and longitudinal steel bars 8, the bent horizontal steel bars are evenly spaced in the vertical direction, and each bent horizontal steel bar is connected by the longitudinal steel bars evenly spaced in the vertical direction; the bent horizontal steel bars are composed of a front horizontal portion 14, a fold line portion 15, a middle horizontal portion 16, a rear horizontal portion 18, a front vertical portion 17 and a rear vertical portion 19, the rear horizontal portions are vertically bent forward at both ends of the rear vertical portion, the front vertical portions are vertically bent inward at the roots of the two rear horizontal portions, the middle horizontal portions are vertically bent forward at the roots of the two front vertical portions, the fold line portions inclined inward are bent forward at the front ends of the two middle horizontal portions, and the front horizontal portions are horizontally bent horizontally at the front ends of the two fold line portions.

[0049] The joint assembly includes an I-beam 6 and a connecting mesh 12. Connecting meshes are symmetrically welded at both ends of the outer side of each flange plate of the I-beam. The connecting mesh is welded by steel bars arranged in a staggered manner horizontally and vertically. The height of the I-beam is the same as the height of the transverse partition wall. The two front horizontal parts of the bent horizontal steel bars are inserted between the two relatively arranged connecting meshes, and the ends of the two front horizontal parts of the bent horizontal steel bars are abutted against the web of the I-beam.

[0050] The lap length between the transverse steel bars on the connecting mesh and the I-beam flange plate is 5 times the diameter of the steel bars.

[0051] A construction process of a large-depth H-shaped underground anti-collision wall, the innovation of which is that it includes the following steps:

[0052] S1: Complete the site clearing and leveling process within the construction area;

[0053] S2: According to the design requirements and measurement and layout of the underground anti-collision wall, complete the guide wall excavation, steel bar binding, formwork support, concrete pouring and maintenance procedures;

[0054] S3: Complete the installation of the trenching machine, the mud pool and the steel cage processing yard in the construction area;

[0055] S4: The underground impact wall is a linear concrete protective structure composed of several H-shaped unit grooves. The H-shaped underground impact wall unit groove 1 is composed of longitudinal walls 4 on both sides and a middle transverse partition wall 5, and is divided into two T-shaped walls with the center line of the transverse partition wall 5 as the boundary. According to the order of construction, they are respectively called the first construction groove section 2 and the second construction groove section 3. The excavation boundary line is marked on the transverse wall of the second construction groove section, and the I-beam serves as the boundary between the first construction groove section and the second construction groove section. This construction process does not require the use of an excavator to carry out large-scale deep excavation of the foundation pit. It is only necessary to use a trenching machine to position the foundation groove of the T-shaped wall on the ground on one side of the guide wall;

[0056] S5: Complete the steel cage cutting, bending and assembly forming process of two T-shaped walls in the steel cage processing plant;

[0057] S6: Figure 3 As shown, the trench section is constructed first, and the steps are as follows:

[0058] S6.1: Perform mud preparation;

[0059] S6.2: Pour the prepared slurry into the foundation trench wall;

[0060] S6.3: Excavate the foundation trench for the first construction trench section and the position between the first construction trench section and the excavation boundary line 10 in the later construction trench section, and lower the processed steel cage into the foundation trench;

[0061] S7: Figure 4 As shown, in the middle part of the transverse partition wall, according to the measurement and layout, the joint assembly is lowered, which is composed of an I-beam and a connecting mesh welded on the outside of the two flange plates of the I-beam. The connecting mesh is made of transverse steel bars 7 and longitudinal steel bars welded in a staggered manner. During the lowering process, the plane deviation and verticality of the I-beam should be controlled. At the same time, prevent the transverse steel bars 7 of the first constructed slot section from colliding with the transverse steel bars welded to the flange plates of the I-beam, causing the transverse steel bars to bend and deform, and unable to be lowered to the correct position. The lap length of the transverse steel bars and the flange plates of the I-beam is 5 times the diameter of the steel bars, and they are welded on both sides;

[0062] S8: Figure 5 As shown, a rectangular joint box 9 is lowered along one side of the I-beam (i.e., the other side of the first constructed trench section), and at the same time, a sand bag 11 is filled in the side of the excavation boundary line between the rectangular joint box and the later constructed trench section (the side adjacent to the first excavated trench section) to prevent the I-beam and the rectangular joint box from displacement and tilting; the I-beam and the rectangular joint box are arranged vertically through the length, and the transverse length of the rectangular joint box is greater than 35 times the diameter of the transverse steel bar;

[0063] S9: pouring concrete into the first constructed trench section;

[0064] S10: After the concrete in the first-constructed trench section reaches the process strength, the subsequent-construction trench section 3 is constructed, and the steps are as follows:

[0065] S10.1: Perform mud preparation;

[0066] S10.2: Pour the prepared slurry into the foundation trench wall;

[0067] S10.3: Excavate the foundation trench for the rear construction trench section, and excavate the sand bags set in the rear construction trench section;

[0068] S11: Figure 5 , Figure 6 As shown, after the foundation trench is accepted, the rectangular joint box is pulled out, and the post-construction trench section reinforcement cage installation and concrete pouring are carried out, thus completing all the construction procedures of the large-depth H-type underground anti-impact wall unit trench.

[0069] The large-depth H-shaped underground anti-collision wall and its construction process of the present invention innovatively solve the construction problem of connecting the transverse partition wall joints. The I-beam and its welded transverse and longitudinal steel bars are used as the first construction slot section and the second construction slot section row plug-in joints to achieve the effective connection between the steel bars and concrete of the two slot sections.

[0070] It should be noted that the elevation of the site leveling should meet the design requirements. If not, excavation or backfilling construction is required. The strength grade of the guide wall concrete should not be lower than C20, the thickness should not be less than 200mm, the burial depth should be 1.5m-2.0m, the top surface should be 100mm higher than the existing ground, and the mud liquid level should be ensured to be more than 1m higher than the groundwater level. The net distance of the inner wall surface is greater than the design thickness of the underground continuous wall by 40mm-60mm.

[0071] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A deep H-shaped underground anti-collision wall, composed of a plurality of H-shaped unit grooves, characterized in that: The H-shaped unit groove includes a T-shaped wall, a steel cage and a joint assembly. The T-shaped wall includes a vertical longitudinal wall and a transverse wall vertically arranged in the center of the upper half of the longitudinal wall. The two T-shaped walls are arranged opposite to each other on the left and right, and the two transverse walls are connected to form a transverse partition wall through a joint assembly. The T-shaped wall is a cast-in-one structure, and a steel cage is arranged in the two T-shaped walls.

2. The deep H-shaped underground anti-collision wall according to claim 1 is characterized in that: The steel cage includes bent horizontal steel bars and longitudinal steel bars. The bent horizontal steel bars are evenly spaced in the vertical direction, and each bent horizontal steel bar is connected by the longitudinal steel bars evenly spaced in the vertical direction. The bent horizontal steel bars are composed of a front horizontal portion, a fold line portion, a middle horizontal portion, a rear horizontal portion, a front vertical portion and a rear vertical portion. The rear horizontal portions are vertically bent forward at both ends of the rear vertical portion, the roots of the two rear horizontal portions are vertically bent inward to form a front vertical portion, the middle horizontal portions are vertically bent forward at the roots of the two front vertical portions, the front ends of the two middle horizontal portions are bent forward to form a fold line portion inclined inward, and the front horizontal portions are horizontally bent at the front ends of the two fold line portions.

3. The deep H-shaped underground anti-collision wall according to claim 1 is characterized by: The joint assembly includes an I-beam and a connecting mesh. Connecting meshes are symmetrically welded at both ends of the outer side of each flange plate of the I-beam. The connecting mesh is welded by steel bars arranged in a staggered manner horizontally and vertically. The height of the I-beam is the same as the height of the transverse partition wall. The two front horizontal parts of the bent horizontal steel bars are inserted between the two relatively arranged connecting meshes, and the ends of the two front horizontal parts of the bent horizontal steel bars are abutted against the web of the I-beam.

4. The deep H-shaped underground anti-collision wall according to claim 1 is characterized by: The lap length between the transverse steel bars on the connecting mesh and the I-beam flange plate is 5 times the diameter of the steel bars.

5. The deep H-shaped underground anti-collision wall according to claim 1 is characterized by: The transverse length of the rectangular joint box is greater than 35 times the diameter of the steel bar.

6. A construction process for a deep H-shaped underground anti-collision wall, characterized in that: The construction process is used to realize the deep H-shaped underground anti-collision wall as described in any one of claims 1 to 5, and comprises the following steps: S1: Complete the site clearing and leveling process within the construction area; S2: According to the design requirements and measurement and layout of the underground anti-collision wall, complete the guide wall excavation, steel bar binding, formwork support, concrete pouring and maintenance procedures; S3: Complete the installation of the trenching machine, the mud pool and the steel cage processing yard in the construction area; S4: using a trenching machine to complete the excavation of the first trench section and the excavation boundary line between the first trench section and the second trench section in the construction area; S5: Complete the installation of the steel cage in the first constructed trench section; S6: lowering an I-beam welded with a connecting mesh at the position where the first constructed trench section and the second constructed trench section are butted against each other; S7: lower a rectangular joint box into a slot formed by an I-beam and a connecting mesh on one side of the rear construction slot section, and fill the rectangular joint box and the rear construction slot section with sand bags to prevent the I-beam and the rectangular joint box from displacement and tilting; S8: pouring concrete into the first constructed trench section; S9: When the concrete in the first construction trench section meets the process requirements, the later construction trench section on the other side of the excavation boundary line is excavated, and the sand bags are dug out during the excavation. After the excavation is completed, the rectangular joint box is taken out, and after the completion, the steel cage in the construction trench section is lowered and installed and the concrete is poured; When the concrete in the later construction trench section meets the process requirements, the forming construction of the deep H-shaped underground anti-collision wall unit trench is completed; S10: Repeat steps 1-9 to complete the construction of several H-shaped unit grooves, thereby completing the construction of the entire large-depth H-shaped underground anti-collision wall.

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