A construction method for installing rubber waterstop on underground continuous wall

Abstract

The present invention provides a construction method for installing a rubber waterstop on an underground continuous wall, which belongs to the field of architectural engineering design and construction technology, and includes the following steps: placing a GXJ rubber waterstop into a joint box, with the center hole of the GXJ rubber waterstop located in a limit slot of the joint box; inserting a limit rod into the center hole of the GXJ rubber waterstop; lowering the steel cage of the leading width trough section; hoisting the joint box into the trough section of the underground continuous wall, close to the steel cage and fixing it; completing the pouring of reinforced concrete of the leading width trough section; pulling out the limit rod, demoulding the joint box from the leading width trough section, and then hoisting the joint box out; lowering the steel cage of the subsequent pouring width trough section, and completing the pouring of reinforced concrete of the subsequent pouring width trough section. The present invention can ensure that the GXJ rubber waterstop does not fall off during the construction process, does not suffer from undesirable conditions such as being torn, and the overall construction operation process is simple, convenient, and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering design and construction, and particularly relates to a construction method for installing a rubber waterstop strip on an underground continuous wall. Background Art

[0002] With the continuous development of urbanization, more and more underground space development and utilization projects are underway. In water-rich areas, foundation pits with excavation depths exceeding 10 meters are commonly protected by underground continuous wall structures. The water-stopping effectiveness of these structures, particularly at the wall joints, is closely linked to foundation pit safety. Three main types of underground wall joints are commonly used in the market: steel joints, lock-end pipe joints, and GXJ rubber waterstop joints. GXJ rubber waterstop joints have quietly gained popularity in cities like Shanghai and Nanjing due to their economical and effective waterstopping performance, and have proven their excellent effectiveness in numerous projects. However, GXJ rubber waterstop joints also have some drawbacks, such as relatively high construction difficulty. In particular, the GXJ rubber waterstop is difficult to secure to the joint box or has a high probability of falling off after securing. Separating the GXJ rubber waterstop from the joint box is difficult or even impossible, and the GXJ rubber waterstop is deformed by the steel cage, which can affect the waterstopping effectiveness at the joints.

[0003] To solve the above problems, the following methods are commonly used:

[0004] (1) Ordinary joint box + wooden wedge fixation + external force stripping method: This method is suitable for situations where the depth of the ground-connected wall is relatively shallow. Before the joint box is hoisted, the GXJ rubber waterstop is fixed to the joint box with wooden wedges, and then placed into the underground continuous wall groove section after the groove is formed together with the joint box; after the concrete of the ground-connected wall is poured and solidified, and the adjacent groove sections are completed and the slurry is cleared, the GXJ rubber waterstop is stripped from the joint box by external force such as an excavator or other machinery. The disadvantages are: if the wooden wedges are not firmly fixed, the GXJ rubber waterstop is easy to fall off during the hoisting process into the groove or during the concrete pouring process, affecting the quality of the joint; if the wooden wedges are too strong, the GXJ rubber waterstop may be difficult to fall off or even torn during the stripping process from the joint box.

[0005] (2) Special joint box + wooden wedge fixation + hydraulic mechanical stripping method: This method is suitable for situations where the depth of the ground-connected wall is deep. Multiple hydraulic jacks are placed in the joint box body in advance. After the construction is completed, the built-in hydraulic jacks provide the power for stripping the GXJ rubber waterstop from the joint box. Before assembling the joint box, the hydraulic jacks must be placed in the joint box body in advance, and the hydraulic supporting lines must be reliably connected; before hoisting the joint box, the GXJ rubber waterstop is fixed to the joint box with wooden wedges, etc., and then placed into the underground continuous wall groove section after the groove is formed together with the joint box; after the ground-connected wall concrete is poured and solidified, and the adjacent groove sections are completed and the slurry is cleared, start the hydraulic stripping device to strip the GXJ rubber waterstop from the joint box, and then hoist the joint box out. The disadvantages are: the structure of the joint box body is relatively complex; if the wooden wedges are not firmly fixed, the GXJ rubber waterstop will easily fall off during the process of hoisting into the groove or pouring concrete, affecting the quality of the joint; if the wooden wedges are fixed too strongly, the GXJ rubber waterstop may be torn during the separation process from the joint box. Summary of the Invention

[0006] In response to the technical problems existing in the prior art, the present invention provides a construction method for installing a rubber waterstop on an underground continuous wall, which can ensure that the GXJ rubber waterstop is reliably fixed on the joint box and does not fall off during the construction process, and can also easily fall off during peeling, ensuring that the GXJ rubber waterstop does not suffer from adverse conditions such as being torn, and the overall construction operation process is simple, convenient and reliable.

[0007] The technical solution adopted by the present invention is: a construction method for installing a rubber waterstop strip on an underground continuous wall, comprising the following steps:

[0008] Step 1: Splice the junction box according to the actual required length;

[0009] Step 2: Place the GXJ rubber waterstop into the joint box. A limit slot is provided on the front of the joint box, and the center hole of the GXJ rubber waterstop is located in the limit slot of the joint box.

[0010] Step 3: Insert the limiting rod into the center hole of the GXJ rubber waterstop and fix the GXJ rubber waterstop on the joint box;

[0011] Step 4: After the trenching and grouting of the first trough section of the underground continuous wall are completed, the reinforcement cage of the first trough section is lowered;

[0012] Step 5: Hoist the joint box with the GXJ rubber waterstop fixed into the slot section of the underground continuous wall, close to the steel cage and fix it; set U-shaped sealing reinforcement at the end of the steel cage close to the GXJ rubber waterstop, with the concave part of the U-shaped sealing reinforcement facing the GXJ rubber waterstop; complete the pouring of reinforced concrete in the first width slot section;

[0013] Step 6: After the concrete of the leading trough section has solidified and the subsequent trough section has been formed and the slurry has been cleared, pull out the limit rods, demould the joint box from the leading trough section, and then lift the joint box out;

[0014] Step 7: Lower the steel cage of the post-cast trough section, set W-shaped sealing reinforcement at the end of the steel cage near the preceding trough section, and the concave part of the W-shaped sealing reinforcement faces the GXJ rubber waterstop; lower and fix the joint box with the GXJ rubber waterstop fixed at the joint between the post-cast trough section and the next trough section, and then complete the pouring of reinforced concrete of the post-cast trough section.

[0015] Further, step eight: repeat steps six to seven until the construction of the underground continuous wall is completed.

[0016] Furthermore, in step three, the limit rod is coated with lubricant and then inserted into the center hole of the GXJ rubber waterstop.

[0017] Furthermore, in step six, during the demoulding process, the joint box moves in a direction away from the preceding width groove section, the center hole of the GXJ rubber waterstop is deformed, and the GXJ rubber waterstop is peeled off from the joint box.

[0018] Furthermore, the limiting slot is adapted to the outer side wall of the center hole of the GXJ rubber water stop, and the limiting rod is adapted to the center hole.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention uses a construction process of setting a limit slot + limit rod to reliably fix the GXJ rubber waterstop on the junction box, which can prevent the rubber waterstop from falling off during the lowering of the junction box; after pulling out the limit rod, when the junction box is demoulded, the deformable property of the center hole of the rubber waterstop is utilized to solve the problem of difficulty in pulling out or tearing the rubber waterstop during the removal of the junction box.

[0021] 2. The present invention adopts the construction process of setting sealing bars with limiting functions on the steel cages of the preceding width trough section and the subsequent width trough section, thereby preventing the waterstop from being squeezed during the lowering of the joint box and the steel cage, ensuring the integrity of the waterstop, and further ensuring the pouring quality of concrete and the water-stopping effect at the joint position.

[0022] 3. The junction box used in the present invention has a simple structure, the limit rod is easy to insert and remove, and the construction is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a flow chart of an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the installation position of the joint box and the steel cage of the leading width trough section according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the position of the joint box after demoulding from the preceding width groove section according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation position of the steel cage of the post-cast trough section according to an embodiment of the present invention.

[0027] In the figure: 1-connector box, 11-limiting slot, 2-GXJ rubber waterstop, 3-limiting rod, 4-rebar cage. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The embodiment of the present invention provides a construction method for installing a rubber water stop strip on an underground continuous wall, such as Figure 1 As shown, it includes the following steps:

[0030] Step 1: Splice the joint box 1 according to the actual required length. The length of the conventional joint box 1 on the market is 12 meters per section. The actual required length of the joint box 1 is the depth of the underground continuous wall. After splicing, place it on a work platform or flat ground.

[0031] Step 2: Place the GXJ rubber waterstop 2 flatly into the junction box 1. A limiting slot 11 is provided at the front of the junction box 1. The limiting slot 11 is adapted to the outer wall of the center hole of the GXJ rubber waterstop 2. The center hole of the GXJ rubber waterstop 2 is located in the limiting slot 11 of the junction box 1.

[0032] Step 3: Apply butter or other lubricants on the surface of the limit rod 3 and insert it into the center hole of the GXJ rubber waterstop 2, and fix the GXJ rubber waterstop 2 on the joint box 1; the size of the limit rod 3 is adapted to the center hole, and the limit rod 3 is used to prevent the center hole from deforming.

[0033] Step 4: After the trenching and grouting of the first width trench section of the underground continuous wall are completed, the steel cage 4 of the first width trench section is lowered.

[0034] Step 5: Hang the joint box 1 fixed with GXJ rubber water stop 2 into the slot section of the underground continuous wall, close to the steel cage 4 and fix it. The front end of the joint box 1 is located at the joint surface of the first width slot section and the later width slot section, as shown in the figure. Figure 2 As shown, a U-shaped sealing bar is installed at the end of the steel cage 4 near the GXJ rubber waterstop 2. The concave portion of the U-shaped sealing bar faces the GXJ rubber waterstop 2. This U-shaped sealing bar has a limit function to prevent the steel cage 4 from squeezing the GXJ rubber waterstop 2 during lowering. The reinforced concrete pouring construction of the first width trough section is completed.

[0035] Step 6: After the concrete of the leading width trough section solidifies and the subsequent width trough section is completed with troughing and slurry cleaning, pull out the limit rod 3 and use an excavator or other mechanical force to demould the joint box 1 from the leading width trough section. During the demoulding process, the joint box 1 moves away from the leading width trough section. Since the GXJ rubber waterstop 2 is fixed on the concrete of the leading width trough section, when the joint box 1 moves, the center hole of the GXJ rubber waterstop 2 is deformed, and the GXJ rubber waterstop 2 is peeled off from the joint box 1. Figure 3 Then the joint box 1 is lifted out of the slot section of the underground continuous wall.

[0036] Step 7: Lower the steel cage 4 of the post-cast trough section, set a W-shaped sealing rib at the end of the steel cage 4 close to the leading trough section, and the concave part of the W-shaped sealing rib is facing the GXJ rubber water stop 2, as shown in the figure. Figure 4 The W-shaped sealing reinforcement contains a limiting function to prevent the steel cage 4 from squeezing the GXJ rubber waterstop 2 during the lowering process. The two ends of the steel cage 4 close to the GXJ rubber waterstop 2 are respectively provided with a W-shaped sealing reinforcement and a U-shaped sealing reinforcement.

[0037] Lower and secure the joint box 1, with the GXJ rubber waterstop 2 fixed to it, at the joint between the post-cast trough section and the next trough section. Then, complete the pouring of reinforced concrete for the post-cast trough section. The process of securing the GXJ rubber waterstop 2 and the joint box 1 is the same as steps 1 to 3.

[0038] Step 8: Repeat steps 6 to 7 until the construction of all GXJ rubber waterstops 2 is completed and the underground continuous wall construction is completed.

[0039] The present invention has been described in detail above through the embodiments, but the contents described are only exemplary embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. The scope of protection of the present invention is defined by the claims. Any use of the technical solution described in the present invention, or any person skilled in the art who, inspired by the technical solution of the present invention, designs a similar technical solution within the essence and scope of protection of the present invention to achieve the above-mentioned technical effects, or any equivalent changes and improvements made to the scope of application, shall still fall within the scope of protection covered by the patent of the present invention.

Claims

1. A construction method for installing a rubber waterstop on an underground continuous wall, characterized in that: The following steps are involved: Step 1: Splice the junction box according to the actual required length; Step 2: Place the GXJ rubber waterstop into the joint box. A limit slot is provided on the front of the joint box, and the center hole of the GXJ rubber waterstop is located in the limit slot of the joint box. Step 3: Insert the limiting rod into the center hole of the GXJ rubber waterstop and fix the GXJ rubber waterstop on the joint box; Step 4: After the trenching and grouting of the first trough section of the underground continuous wall are completed, the reinforcement cage of the first trough section is lowered; Step 5: Hoist the joint box with the GXJ rubber waterstop fixed into the slot section of the underground continuous wall, close to the steel cage and fix it; set U-shaped sealing reinforcement at the end of the steel cage close to the GXJ rubber waterstop, with the concave part of the U-shaped sealing reinforcement facing the GXJ rubber waterstop; complete the pouring of reinforced concrete in the first width slot section; Step 6: After the concrete of the leading trough section has solidified and the subsequent trough section has been formed and the slurry has been cleared, pull out the limit rods, demould the joint box from the leading trough section, and then lift the joint box out; Step 7: Lower the steel cage of the post-cast trough section, set W-shaped sealing reinforcement at the end of the steel cage near the preceding trough section, and the concave part of the W-shaped sealing reinforcement faces the GXJ rubber waterstop; lower and fix the joint box with the GXJ rubber waterstop fixed at the joint between the post-cast trough section and the next trough section, and then complete the pouring of reinforced concrete of the post-cast trough section.

2. The construction method for installing a rubber waterstop for an underground continuous wall according to claim 1, characterized in that: Step 8: Repeat steps 6 to 7 until the underground continuous wall construction is completed.

3. The construction method for installing a rubber waterstop strip for an underground continuous wall according to claim 1, wherein: In step three, apply lubricant to the surface of the limit rod and insert it into the center hole of the GXJ rubber waterstop.

4. The construction method for installing a rubber waterstop for an underground continuous wall according to claim 1, wherein: In step six, during the demoulding process, the joint box moves away from the preceding width groove section, the center hole of the GXJ rubber waterstop is deformed, and the GXJ rubber waterstop is peeled off from the joint box.

5. The construction method for installing a rubber waterstop for an underground continuous wall according to claim 1, wherein: The limiting card slot is adapted to the outer side wall of the center hole of the GXJ rubber water stop, and the limiting rod is adapted to the center hole.

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