Contact grouting construction method for post-poured structural joint

Abstract

The invention relates to the technical field of constructional engineering construction, in particular to a post-cast structural joint contact grouting construction method which specifically comprises the following steps: reserving a rectangular hole for material reshipment in a structural top plate according to construction requirements, and ensuring that concrete small beams are arranged on the periphery of the lower end of the rectangular hole; rectangular grooves communicated with the rectangular holes are respectively reserved in the top ends of the four concrete small beams; the bottom surface and the side surfaces of the rectangular groove are fully paved with slurry leakage prevention nets; grouting pipes are installed at the positions of the construction joints; after the materials in the underground cavity are transferred, structural slab concrete used for blocking the rectangular hole is poured, and when the concrete reaches the design strength and construction joints around the rectangular hole shrink and crack, grouting is conducted through a grouting pipe; according to the method, the grouting pipe is pre-buried at the structural joint between the post-pouring structural slab and the structural top slab, and the problem of water seepage caused by cracking of the structural joint due to shrinkage of the post-pouring concrete structural slab at the reserved hole is solved in a secondary grouting and joint filling mode.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, in particular to a post-cast structural joint contact grouting construction method. Background Art

[0002] The test water pool structure within a certain test plant project is surrounded by a cavity structure. During the construction process, a large number of materials such as steel pipes, fasteners, and formwork timber cannot be transported. Temporary holes must be set on the top plate of the underground cavity structure. After the materials in the cavity are transported, the reserved material holes will be sealed. However, in order to prevent water leakage from the top plate, the holes, construction joints, and shrinkage cracks must also be treated. Currently, there is no good solution to the above water seepage problem. Summary of the Invention

[0003] The purpose of the present invention is to provide a post-cast structural joint contact grouting construction method to solve the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A post-cast structural joint contact grouting construction method specifically comprises the following steps:

[0006] Step 1: During the construction of the underground cavity structure roof, rectangular holes for material transportation are reserved on the structure roof according to construction needs. Concrete beams are placed around the lower ends of the rectangular holes, and rectangular grooves connected to the rectangular holes are reserved at the tops of the four concrete beams.

[0007] Step 2: Cover the bottom and sides of the rectangular groove with anti-leakage grouting mesh. At the same time, the structural top plate steel bars pass through the anti-leakage grouting mesh and extend into the rectangular hole to meet the overlap length requirements.

[0008] Step 3: Install the grouting pipe at the construction joint, with both ends of the grouting pipe extending a certain length from the top plate surface of the structure;

[0009] Step 4: After the materials in the underground cavity are transported, the structural top plate steel bars are connected, the casting formwork is installed, and the structural plate concrete for sealing the rectangular hole is poured. When the concrete reaches the design strength and the construction joints around the rectangular hole shrink and crack, grouting is performed through the grouting pipe;

[0010] Step 5: Check whether the construction joint between the post-cast structural plate and the structural top plate is leaking. After confirming that there is no water seepage, cut off the exposed part of the grouting pipe and permanently seal all grouting holes on the grouting pipe.

[0011] Furthermore, the width of the rectangular groove is 100-150 mm and is no greater than 1 / 2 of the beam width, and the depth of the rectangular groove is the same as the thickness of the structural top plate.

[0012] Furthermore, the anti-leakage mesh is a wire mesh or a quick-closing mesh, and the anti-leakage mesh must be firmly tied when laid; when the anti-leakage mesh is a wire mesh, the rectangular grooves are roughened before laying; when the anti-leakage mesh is a quick-closing mesh, there is no need to roughen the rectangular grooves.

[0013] Furthermore, a pipe clamp is provided on the grouting pipe at intervals of 300 mm, and the pipe clamp is fixed on the side wall of the rectangular groove.

[0014] Furthermore, the length of a single grouting pipe does not exceed 5m, and both ends of the grouting pipe extend 100 to 150mm beyond the surface of the structural top plate.

[0015] Furthermore, before grouting, a grouting needle is connected to one end of the exposed part of the grouting pipe, and the other end is sealed with a special plug. The injected slurry uses modified epoxy resin grouting material, cement slurry or a mixture of cement slurry and water glass.

[0016] Furthermore, in step five, the specific method for checking whether the construction joint between the post-cast structural plate and the structural top plate is leaking is: checking the leakage of the construction joint by spraying water 24 hours after grouting.

[0017] Furthermore, in step five, the sealing material for permanently sealing all grouting holes on the grouting pipe is epoxy resin mortar.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a post-cast structural joint contact grouting construction method, which solves the problem of cracking of the structural joints of the post-cast concrete structural slabs at the reserved holes due to shrinkage and thus causing water seepage by pre-embedding grouting pipes in the structural joints between the post-cast structural slabs and the structural top slab, and filling the joints with secondary grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a building structure after construction using a post-cast structural joint contact grouting construction method provided by the present invention;

[0021] Figure 2 This invention Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0022] Figure 3 This invention Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle.

[0023] The numbers in the accompanying drawings are: 1-main beam, 2-secondary beam, 3-grouting pipe, 4-structural plate, 5-structural top plate steel bar, 6-rectangular groove, 7-anti-leakage grouting net, 8-pipe clamp. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] See also Figures 1 to 3 As shown, a post-cast structural joint contact grouting construction method specifically includes the following steps:

[0026] Step 1: During the construction phase of the top plate of the underground cavity structure, a rectangular hole for material transportation is reserved on the top plate of the structure according to construction needs. It is necessary to ensure that there are concrete beams around the lower end of the rectangular hole. The concrete beams include: a main beam 1 and a secondary beam 2. In this embodiment, two main beams 1 and two secondary beams 2 are provided. The tops of the main beams 1 and the secondary beams 2 are flush. The two main beams 1 and the two secondary beams 2 are symmetrically arranged to form a rectangular frame structure, and rectangular grooves 6 connected to the rectangular holes are reserved on the tops of the two main beams 1 and the two secondary beams 2.

[0027] Step 2: Cover the bottom and side surfaces of the rectangular groove 6 with a slurry-proof mesh 7. The slurry-proof mesh 7 can prevent concrete leakage during the concrete pouring process. The slurry-proof mesh 7 is made of a wire mesh or a quick-closing mesh. At the same time, the structural top plate steel bars 5 pass through the slurry-proof mesh 7 and extend into the rectangular hole to meet the overlap length requirements.

[0028] Step 3: Install the grouting pipe 3 at the construction joint. The grouting pipe 3 must be fixed with a pipe clamp 8 to prevent displacement during concrete pouring. Both ends of the grouting pipe 3 extend a certain length from the top plate of the structure and take protective measures for the finished product to prevent damage to it during concrete pouring.

[0029] Step 4: After the materials in the underground cavity are transported, the structural top plate steel bars 5 are overlapped, the casting template is installed, and the structural plate 4 concrete for sealing the rectangular hole is poured. When the concrete reaches the design strength and the construction joints around the rectangular hole shrink and crack, grouting is performed through the grouting pipe 3 to achieve the purpose of filling the gap;

[0030] Step 5: Check whether the construction joint between the post-cast structural plate 4 and the structural top plate is leaking. After confirming that there is no water seepage, cut off the exposed part of the grouting pipe 3 and permanently seal all grouting holes on the grouting pipe 3.

[0031] In this embodiment, the width of the rectangular groove 6 is 100-150 mm and is no greater than 1 / 2 of the beam width, and the depth of the rectangular groove 6 is the same as the thickness of the structural top plate.

[0032] In this embodiment, the anti-leakage mesh 7 must be tied securely when laid; when the anti-leakage mesh 7 is a wire mesh, the rectangular grooves are roughened before laying and the site is cleaned; when the anti-leakage mesh 7 is a quick-closing mesh, there is no need to roughen the rectangular grooves.

[0033] In this embodiment, the grouting pipe 3 can be selected as a disposable grouting pipe or a reusable grouting pipe (a disposable grouting pipe can only be used for grouting once and cannot be reused; a reusable grouting pipe can be reused many times, and the pipe core and the outer wall of the pipe need to be rinsed clean after each use). The grouting pipe must be installed at the position of the construction joint, and a pipe clamp 8 is set every 300mm to prevent the grouting pipe from shifting during the concrete pouring process and being wrapped by concrete, thereby losing the grouting and filling effect; the pipe clamp 8 is fixed on the side wall of the rectangular groove 6.

[0034] In this embodiment, the length of a single grouting pipe 3 does not exceed 5m, and the specifications of the grouting pipe 3 can be selected according to actual needs (common specifications are inner diameter 8mm and outer diameter 12mm). A number of grouting holes are evenly opened on the side wall of the grouting pipe 3. Both ends of the grouting pipe 3 extend 100 to 150mm from the structural top plate surface, and the finished product is protected by wrapping.

[0035] In this embodiment, before grouting, a grouting needle is connected to one end of the exposed part of the grouting pipe 3, and the other end is sealed with a special plug. The injected slurry can be a high-permeability modified epoxy resin grouting material, cement slurry, or a mixture of cement slurry and water glass, etc.; special attention should be paid to the selection of the grouting needle to match the type of grouting liquid to avoid the phenomenon of being unable to be injected.

[0036] In this embodiment, in step five, the specific method for checking whether the construction joint between the post-cast structural plate and the structural top plate is leaking is: checking the leakage of the construction joint by spraying water 24 hours after grouting.

[0037] In this embodiment, in step five, the sealing material for permanently sealing all grouting holes on the grouting pipe 3 is epoxy resin mortar.

[0038] It should be noted that the structural joints and construction joints in the present invention refer to the gaps between the post-cast structural slabs and the structural top slabs.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent replacement and improvement made by any technician familiar with the profession to the above embodiment without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A post-cast structural joint contact grouting construction method, characterized in that: The specific steps include: Step 1: During the construction of the underground cavity structure roof, rectangular holes for material transportation are reserved on the structure roof according to construction needs. Concrete beams are placed around the lower ends of the rectangular holes, and rectangular grooves connected to the rectangular holes are reserved at the tops of the four concrete beams. Step 2: Cover the bottom and sides of the rectangular groove with anti-leakage grouting mesh. At the same time, the structural top plate steel bars pass through the anti-leakage grouting mesh and extend into the rectangular hole to meet the overlap length requirements. Step 3: Install the grouting pipe at the construction joint, with both ends of the grouting pipe extending a certain length from the top plate surface of the structure; Step 4: After the materials in the underground cavity are transported, the structural top plate steel bars are connected, the casting formwork is installed, and the structural plate concrete for sealing the rectangular hole is poured. When the concrete reaches the design strength and the construction joints around the rectangular hole shrink and crack, grouting is performed through the grouting pipe; Step 5: Check whether the construction joint between the post-cast structural plate and the structural top plate is leaking. After confirming that there is no water seepage, cut off the exposed part of the grouting pipe and permanently seal all grouting holes on the grouting pipe.

2. A post-cast structural joint contact grouting construction method according to claim 1, characterized in that: The width of the rectangular groove is 100-150 mm and is no greater than 1 / 2 of the beam width, and the depth of the rectangular groove is the same as the thickness of the structural top plate.

3. The post-cast structural joint contact grouting construction method according to claim 1, characterized in that: The anti-leakage mesh is a wire mesh or a quick-closing mesh, and the anti-leakage mesh must be firmly tied when laid; when the anti-leakage mesh is a wire mesh, the rectangular grooves are roughened before laying; when the anti-leakage mesh is a quick-closing mesh, the rectangular grooves do not need to be roughened.

4. The post-cast structural joint contact grouting construction method according to claim 1, characterized in that: A pipe clamp is provided on the grouting pipe at intervals of 300 mm, and the pipe clamp is fixed on the side wall of the rectangular groove.

5. The post-cast structural joint contact grouting construction method according to claim 1, characterized in that: The length of a single grouting pipe does not exceed 5m, and both ends of the grouting pipe extend 100 to 150mm beyond the surface of the structural top plate.

6. A post-cast structural joint contact grouting construction method according to claim 5, characterized in that: Before grouting, a grouting needle is connected to one end of the exposed part of the grouting pipe, and the other end is sealed with a special plug. The injected slurry uses modified epoxy resin grouting material, cement slurry or a mixture of cement slurry and water glass.

7. The post-cast structural joint contact grouting construction method according to claim 1, characterized in that: In the step 5, the specific method for checking whether the construction joint between the post-cast structural plate and the structural top plate is leaking is: checking the leakage of the construction joint by spraying water 24 hours after grouting.

8. The post-cast structural joint contact grouting construction method according to claim 1, characterized in that: In the step 5, the sealing material for permanently sealing all the grouting holes on the grouting pipe is epoxy resin mortar.

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