CN107246003B - Device for improving radial perpendicularity of underground diaphragm wall reinforcement cage and construction method - Google Patents

Abstract

The invention belongs to the technical field of building construction methods and devices, and particularly relates to a device and a construction method for improving radial perpendicularity of an underground continuous wall reinforcement cage. The invention solves the problem of larger radial deflection generated in the process of lowering the reinforcement cage due to the influence of the rigidity of the reinforcement cage and the backfill material on the back side of the H-shaped steel, adopts the triangular support and the comb-tooth steel plate, takes measures from two directions of horizontal and vertical, controls the integral deflection of the reinforcement cage, and has more obvious effect; the existing reinforcing steel bars on site are utilized, the construction is simple, the cost is low, the material cost and the labor cost can be effectively saved, and the purposes of small investment and good effect are achieved.

Description

A device and construction method for improving the radial verticality of underground continuous wall steel cages

Technical field

The invention belongs to the technical field of building construction methods and devices, and specifically relates to a device and a construction method for improving the radial verticality of underground continuous wall steel cages.

Background technique

Underground diaphragm walls are widely used in large highways, municipalities and water conservancy projects. Especially with the improvement of construction equipment and the improvement of design skills, underground diaphragm walls are developing in a deeper and larger direction. H-shaped steel joints are the most common joints. processing method.

In order to meet the requirements for the steel cage to be lowered straight down, there is a gap of about 25cm between the H-shaped steel that has been poured in the trough section and the steel cage in the trough section to be poured during the design. However, during the process of lowering the steel cage, especially the ultra-deep The underground continuous wall steel cage is affected by the stiffness of the steel cage itself, and the verticality is difficult to control. It is also affected by the material on the back side of the H-shaped steel, which generates horizontal thrust towards the poured side, causing the overall steel cage to deviate to the poured side; in addition, the groove The hole depth of the section is generally slightly deeper than the designed value, and the H-shaped steel is slightly shorter than the set hole depth, causing the H-shaped steel to be suspended at the bottom, increasing the offset of the steel cage when backfilling material on the back side of the H-shaped steel, and ultimately causing the entire The radial offset of the steel cage reaches more than 60cm.

Contents of the invention

The purpose of the present invention is to overcome the problem of large radial deflection in the prior art caused by the stiffness of the steel cage and the backfill material on the back of the H-shaped steel, which causes the steel cage to be lowered during the lowering process.

To this end, the present invention provides a device for improving the radial verticality of underground diaphragm wall steel cages, including H-shaped steel in the poured channel section, steel cages in the channel section to be poured, side H-shaped steel to be poured, and excavated slots to be poured. , the H-shaped steel of the poured trough section is vertically connected at the intersection of the poured trough section and the excavated slot hole to be poured. The steel cage of the trough section to be poured is located in the excavated slot hole to be poured. One side of the steel cage of the trough section to be poured is connected to There is a gap between the H-shaped steel in the poured trough section. The other side of the steel cage in the trough section to be poured is connected to the H-shaped steel on the side to be poured. The H-shaped steel in the poured trough section includes H-shaped steel flange plates and H-shaped steel webs. The H-shaped steel web Both ends of the plate are connected to H-shaped steel flange plates. The steel cage of the channel section to be poured includes multiple transverse and longitudinal bars. The transverse bars are vertically connected to the longitudinal bars. The H-shaped steel on the side to be poured includes steel flange plates and steel webs. The steel webs Both ends are connected to steel flange plates respectively, and also include triangular supports and comb-toothed steel bars. The triangular supports are horizontally connected to the steel cages of the tank sections to be poured and are located in the gaps. The comb-toothed steel bars are vertically connected to the bottom of the H-shaped steel on the side to be poured and the opening to be poured. Dig between the bottoms of the trench holes.

The triangular support includes a horizontal steel bar, a middle horizontal steel bar and a vertical connecting steel bar. One end of the horizontal steel bar and the middle horizontal steel bar is connected to the horizontal bar, and the number of horizontal steel bars is two, respectively located on both sides of the middle horizontal steel bar. The middle horizontal steel bar is vertically connected to the horizontal bar. The other end of the steel bar and the middle horizontal steel bar are brought together to connect the vertical contact steel bars.

The steel cage of the groove section to be poured is vertically connected to a triangular support every 2m. The distance between the triangular support and the H-shaped steel web is 10cm. The diameter length of the horizontal steel bar and the middle horizontal steel bar is 28mm. The vertical contact steel bar is Diameter length is 20mm.

The comb-toothed steel bars are double-sided welded on the inside of the bottom of the H-shaped steel on the side to be poured. The number of comb-toothed steel bars is multiple and the distance between two adjacent ones is 15cm. The diameter of the comb-toothed steel bars is 20mm, and the welding leg height is not less than 6mm. , the depth of the comb-toothed steel bars into the bottom of the trench to be poured is 10cm.

A construction method for improving the radial verticality of underground diaphragm wall steel cages, including the following steps:

1) Conduct hole formation inspection on the trench holes to be poured and excavated to determine the depth of the hole formation and the verticality of the H-shaped steel in the poured trench section;

2) Determine the height of the triangular support and the length of the comb steel bars;

3) Material preparation: Prepare corresponding steel bars according to the height of the triangular support and the length of the comb steel bars;

4) Welding the triangular support: first determine the welding position and mark it, then find the prepared steel bar materials and weld them one by one, and finally use vertical connecting steel bars to connect the triangular support into a whole;

5) Welding comb steel bars: First, locate and mark the bottom of the H-shaped steel on the side to be poured, and weld the prepared steel bars one by one to the H-shaped steel on the side to be poured. After the welding is completed, ensure that each steel bar is straight and has no bending deformation;

6) Lower the steel cage of the trough section to be poured: After the excavated slot hole to be poured has passed the test, lower the steel cage of the trough section to be poured. The triangular support and the H-shaped steel of the poured trough section cannot collide with each other when lowered;

7) Continuously pour concrete underwater. During pouring, ensure that the steel cage of the tank section to be poured does not move or float.

The steel bars prepared as described are straight, pollution-free and have no quality defects.

Beneficial effects of the present invention: In the device and construction method for improving the radial verticality of underground continuous wall steel cages provided by the present invention, the triangular support is arranged between the H-shaped steel and the steel cage, which reduces the gap between the H-shaped steel and the steel cage. There is a movable gap, and the comb-toothed steel plate is incorporated into the bottom of the slot, which limits the free movement of the steel cage. At the same time, it can prevent the backfill material from sliding from the bottom of the H-shaped steel into the slot section to be poured, effectively solving the radial offset of the steel cage. It improves the radial verticality of the steel cage, ensures the quality of the joints, avoids the occurrence of water leakage in the underground diaphragm wall, protects the construction of subsequent projects, and achieves the purpose of safe production. It can be widely used in H-shaped steel joints. In the construction process of the ultra-deep underground diaphragm wall, triangular supports and comb-toothed steel plates are used, and measures are taken from both horizontal and vertical directions to control the overall deflection of the steel cage, and the effect is more obvious; the measures taken in the present invention all use on-site The existing steel bars are simple to construct and low in cost, which can effectively save material costs and labor costs. They have the remarkable characteristics of low investment and good results.

Description of the drawings

The present invention will be further described in detail below with reference to the accompanying drawings.

Figure 1: Plan view of the trough section where the triangular support is installed;

Figure 2: Enlarged structural view of the triangular support;

Figure 3: Cross-sectional view of the trough section where the comb steel bars are installed;

Figure 4: Enlarged structural view of comb steel bars.

Explanation of reference signs: 1. H-shaped steel in the poured trough section; 11. H-shaped steel flange plate; 12. H-shaped steel web; 2. Triangular support; 21. Horizontal steel bar; 22. Middle horizontal steel bar; 23. Vertical Contact steel bars; 3. Reinforcement cage of the trough section to be poured; 31. Transverse bars; 32. Longitudinal bars; 4. Side H-shaped steel to be poured; 41. Steel flange plate; 42. Steel web; 5. Excavated slot hole to be poured. ; 6. Comb-toothed steel bars; 7. Gap; W, the distance between the triangular support and the H-shaped steel of the poured tank section; L, the height of the triangular support; B. The length of the comb-toothed steel bar; B1, the comb-toothed steel bar is inserted to be poured The depth of the bottom of the excavation slot; B2, the length of the welding leg; JH, the height of the welding leg.

Detailed ways

Example 1:

As shown in Figures 1 and 3, a device for improving the radial verticality of underground diaphragm wall steel cages includes H-shaped steel 1 in the poured channel section, steel cage 3 in the channel section to be poured, H-shaped steel 4 on the side to be poured, and H-shaped steel cages 4 to be poured. Pour the excavation slot 5. The H-shaped steel 1 of the poured trough section is vertically connected at the intersection of the poured trough section and the excavated slot 5 to be poured. The steel cage 3 of the trough section to be poured is located in the excavated slot 5 to be poured. , there is a gap 7 between one side of the steel cage 3 of the trough section to be poured and the H-shaped steel 1 of the trough section that has been poured, and the other side of the steel cage 3 of the trough section to be poured is connected to the H-shaped steel 4 of the side to be poured, and the H-shaped steel of the trough section that has been poured 1 includes an H-shaped steel flange plate 11 and an H-shaped steel web 12. Both ends of the H-shaped steel web 12 are connected to the H-shaped steel flange plate 11. The steel cage 3 of the tank section to be poured includes a plurality of transverse bars 31 and longitudinal bars 32. The transverse bars 31 is vertically connected to the longitudinal bars 32. The side H-shaped steel 4 to be poured includes steel flange plates 41 and steel webs 42. Both ends of the steel web 42 are connected to steel flange plates 41 respectively, and also includes triangular supports 2 and comb-tooth steel bars 6. The triangular support 2 is horizontally connected to the steel cage 3 of the trough section to be poured and is located in the gap 7, and the comb-toothed steel bars 6 are vertically connected between the bottom of the H-shaped steel 4 on the side to be poured and the bottom of the excavated slot 5 to be poured; the triangular support 2 is set in In the gap 7, the movable gap between the H-shaped steel 1 of the poured trough section and the steel cage 3 of the trough section to be poured is reduced. The comb-toothed steel bars 6 are mixed into the bottom of the excavated slot hole 5 to be poured, limiting the trough to be poured. The free movement of the steel cage of the section can also prevent the backfill material from sliding from the bottom of the H-shaped steel 4 on the side to be poured into the tank section to be poured, which effectively solves the radial offset of the steel cage 3 in the tank section to be poured and improves the efficiency of the tank section to be poured. The radial verticality of the steel cage 3 ensures the quality of the joints, avoids the occurrence of water leakage in the underground diaphragm wall, protects the construction of subsequent projects, achieves the purpose of safe production, and can be widely used in H-shaped steel joints. Ultra-deep underground diaphragm wall construction process.

Example 2:

As shown in Figures 1 and 2, based on Embodiment 1, the triangular support 2 includes a horizontal steel bar 21, a middle horizontal steel bar 22 and a vertical connecting steel bar 23. One end of the horizontal steel bar 21 and the middle horizontal steel bar 22 is connected to a transverse bar. 31 and the number of horizontal steel bars 21 is two, which are located on both sides of the middle horizontal steel bar 22. The middle horizontal steel bar 22 is vertically connected to the transverse bar 31, and the other ends of the horizontal steel bars 21 and the middle horizontal steel bar 22 are connected together to connect the vertical contact steel bars 23; The steel cage 3 of the pouring tank section is vertically connected to a triangular support 2 every 2m. The distance between the triangular support 2 and the H-shaped steel web 12 is 10cm. The diameter length of the horizontal steel bar 21 and the middle horizontal steel bar 22 is 28mm. The vertical connection The diameter length of the steel bar 23 is 20mm. The triangular support 2 and the steel cage 3 of the trough section to be poured are welded together. The triangular support 2 is set at a vertical position of 2m. The height L of each place may be inconsistent. According to the actual measurement of the H-shaped steel 1 of the poured trough section and the steel cage of the trough section to be poured. The gap between 3 is determined, which reduces the movable gap between the H-shaped steel 1 of the poured trough section and the steel cage 3 of the trough section to be poured, improves the radial verticality of the steel cage 3 of the trough section to be poured, and ensures the joint quality, effectively solving the problem of radial offset of the steel cage 3 in the tank section to be poured.

As shown in Figures 3 and 4, the comb-toothed steel bars 6 are welded on both sides on the inside of the bottom of the H-shaped steel 4 on the side to be poured. There are multiple comb-toothed steel bars 6 and the distance between two adjacent ones is 15cm. The comb-toothed steel bars The diameter length of 6 is 20mm, the height of the welding leg is not less than 6mm, and the depth of the bottom of the comb-tooth steel bar 6 into the trench 5 to be poured and excavated is 10cm. The comb-toothed steel bars 6 are set with steel bars and are welded on the inside of the bottom of the H-shaped steel 4 in the tank section to be poured (concrete side to be poured). They are double-sided welded. The length of the weld meets the design requirements. The length of the steel bar B is determined according to the measured depth of the slot hole, which needs to be met. The depth of the bottom of the slot is about 10cm, and the comb-toothed steel bars 6 are incorporated into the bottom of the excavated slot 5 to be poured, which limits the free movement of the steel cage in the slot section to be poured, and at the same time prevents the backfill material from sliding from the bottom of the H-shaped steel 4 on the side to be poured. into the trough section to be poured, which effectively solves the radial offset of the steel cage 3 in the trough section to be poured, improves the radial verticality of the steel cage 3 in the trough section to be poured, ensures the joint quality, and avoids the leakage problem of the underground diaphragm wall occurrence, it plays a protective role in the construction of subsequent projects and achieves the purpose of safe production.

Example 3

As shown in Figures 1-4, based on Embodiments 1 and 2, a construction method for improving the radial verticality of underground continuous wall steel cages includes the following steps:

1) Perform hole formation inspection on the slot hole 5 to be excavated to determine the hole formation depth and the verticality of the H-shaped steel 1 of the poured slot section; use ultrasonic hole inspection equipment and measuring ropes to conduct hole formation inspection on the slot hole to determine the hole formation Depth and verticality of H-shaped steel 1 in the poured trough section;

2) Determine the height of the triangular support 2 and the length of the comb-tooth steel bar 6; ① According to the ultrasonic hole inspection results, draw the vertical line shape of the H-shaped steel 1 of the poured tank section, and calculate each triangle based on the characteristics of the triangular support 2 described in Embodiment 2 The height of the support L; ② According to the hole depth detected by the measuring rope and the characteristics of the comb steel bar 6 described in Example 2, the length B of the comb steel bar is calculated;

3) Material preparation: Prepare corresponding steel bars according to the height of the triangular support 2 and the length of the comb steel bars 6; the steel bars are required to be straight, pollution-free, and have no quality defects, and the diameter of the steel bars must not be reduced arbitrarily;

4) Welding the triangular support 2: First determine the welding position and mark it, then find the prepared steel bar materials and weld them one by one, and finally use the vertical connecting steel bars 23 to connect the triangular support 2 into a whole; the vertical distance between the triangular supports 2 is 2m At one point, first determine the welding position, and mark the transverse bars 31 of the steel cage 3 of the channel section to be welded to be poured. Since the height of the triangular support 2 may be inconsistent at each place, find the prepared steel bar materials accordingly and weld them one by one. , and finally use the vertical connecting steel bars 32 to connect them into a whole. The horizontal steel bars 21 and the steel cage 3 of the tank section to be poured must be firmly welded, and at the same time, the steel bars of the steel cage 3 of the tank section to be poured must not be burned.

5) Welding comb steel bars 6: First, locate and mark the bottom of the H-shaped steel 4 on the side to be poured, and weld the prepared steel bars one by one to the H-shaped steel 4 on the side to be poured. After the welding is completed, ensure that each steel bar is straight and without bends. Deformation; double-sided welding is used, the length meets the specification requirements, and the welding leg height is not less than 6mm;

6) Lower the steel cage 3 of the trough section to be poured: After the excavated slot hole 5 to be poured is inspected, lower the steel cage 3 of the trough section to be poured. The triangular support 2 and the H-shaped steel 1 of the poured trough section cannot collide with each other when lowering; After passing the slot inspection, lower the steel cage 3 of the trough section to be poured in time. Pay attention to the gap between the triangular support 2 and the H-shaped steel 1 of the poured trough section to avoid collision, as well as the top elevation of the H-shaped steel 1 of the poured trough section. It is avoided that the H-shaped steel 1 of the poured trough section cannot be lowered in place, and the depth of the comb-toothed steel bars 6 into the bottom of the excavated slot 5 to be poured is not enough.

7) Continuously pour concrete underwater. During pouring, ensure that the steel cage 3 in the section to be poured does not move or float. The concrete pouring process must be continuous. Pay attention to the fact that the steel cage 3 in the pouring tank section must not move or float.

The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are the same or similar to the present invention fall within the protection scope of the present invention.

Claims (2)

1. A construction method for a device that improves the radial verticality of underground diaphragm wall steel cages, characterized in that the device for improving the radial verticality of underground diaphragm wall steel cages includes H-shaped steel (1 ), the steel cage (3) of the trough section to be poured, the H-shaped steel (4) on the side to be poured, and the excavated slot (5) to be poured. The H-shaped steel (1) of the poured trough section is vertically connected to the poured trough section and At the intersection of the excavated slot hole (5) to be poured, the steel cage (3) of the trough section to be poured is located in the excavated slot hole (5) to be poured. One side of the steel cage (3) of the trough section to be poured is in contact with the trough section that has been poured There is a gap (7) between the H-shaped steels (1). The other side of the steel cage (3) of the tank section to be poured is connected to the H-shaped steel (4) on the side to be poured. The H-shaped steel (1) of the poured tank section includes the H-shaped steel flange. plate (11) and H-shaped steel web (12). Both ends of the H-shaped steel web (12) are connected to the H-shaped steel flange plate (11). The steel cage (3) of the channel section to be poured includes multiple transverse bars (31) and longitudinal bars (32), and transverse bars (31) are vertically connected to the longitudinal bars (32). The side H-shaped steel (4) to be poured includes a steel flange plate (41) and a steel web (42). The steel web (42) Each end is connected to the steel flange plate (41), which is characterized in that it also includes a triangular support (2) and a comb-toothed steel bar (6). The triangular support (2) is horizontally connected to the steel cage (3) of the tank section to be poured and is located in the gap ( 7), the comb-tooth steel bar (6) is vertically connected between the bottom of the H-shaped steel (4) on the side to be poured and the bottom of the excavated slot (5) to be poured; The triangular support (2) includes a horizontal steel bar (21), a middle horizontal steel bar (22) and a vertical connecting steel bar (23). One end of the horizontal steel bar (21) and the middle horizontal steel bar (22) is connected to the transverse bar (31) and is horizontally connected. The number of steel bars (21) is two, which are respectively located on both sides of the middle horizontal steel bar (22). The middle horizontal steel bar (22) is vertically connected to the horizontal bar (31), and the other ends of the horizontal steel bar (21) and the middle horizontal steel bar (22) are connected to the vertical bars. To contact steel(23); The comb-toothed steel bars (6) are welded on both sides on the inside of the bottom of the H-shaped steel (4) on the side to be poured. There are multiple comb-toothed steel bars (6) and the distance between two adjacent ones is 15cm. The comb-toothed steel bars (6) The diameter length is 20mm, the height of the welding leg is not less than 6mm, and the depth of the comb tooth steel bar (6) into the bottom of the excavated slot (5) to be poured is 10cm; The steel cage (3) of the tank section to be poured is vertically connected to a triangular support (2) every 2m. The distance between the triangular support (2) and the H-shaped steel web (12) is 10cm. The horizontal steel bars (21) The diameter length of the middle horizontal steel bar (22) is 28mm, and the diameter length of the vertical contact steel bar (23) is 20mm; The method includes the following steps: 1) Carry out hole inspection on the trench hole (5) to be excavated to be poured, and determine the depth of the hole and the verticality of the H-shaped steel (1) of the poured trench section; 2) Determine the height of the triangular support (2) and the length of the comb steel bars (6); 3) Material preparation: Prepare the corresponding steel bars according to the height of the triangular support (2) and the length of the comb steel bars (6); 4) Welding the triangular support (2): first determine the welding position and mark it, then find the prepared steel bar materials and weld them one by one, and finally use the vertical connecting steel bars (23) to connect the triangular support (2) into a whole; 5) Welding comb steel bars (6): First, locate and mark the bottom of the H-shaped steel (4) on the side to be poured, and weld the prepared steel bars one by one to the H-shaped steel (4) on the side to be poured. After the welding is completed, ensure that each The steel bars are straight and have no bending deformation; 6) Lower the steel cage (3) of the trough section to be poured: After the excavated slot hole (5) to be poured has passed the test, lower the steel cage (3) of the trough section to be poured. The triangular support (2) and the trough section that have been poured are lower. H-shaped steel (1) cannot collide with each other; 7) Continuously pour concrete underwater. During pouring, ensure that the steel cage (3) of the tank section to be poured does not move or float; The triangular support (2) is set between the H-shaped steel and the steel cage, which reduces the movable gap between the H-shaped steel and the steel cage. The comb-toothed steel plate is incorporated into the bottom of the slot, which limits the free movement of the steel cage. From the horizontal and The overall offset of the steel cage is controlled in two vertical directions; at the same time, it can prevent the backfill material from sliding from the bottom of the H-shaped steel into the groove section to be poured, effectively solving the radial offset of the steel cage and improving the radial verticality of the steel cage. , ensuring the quality of the joints, avoiding the occurrence of water leakage problems in the underground diaphragm wall, and playing a protective role in the construction of subsequent projects. 2. The construction method for improving the radial verticality of underground diaphragm wall steel cages as claimed in claim 1, characterized in that the prepared steel bars are straight, pollution-free and have no quality defects.