Post-cast strip pressure reduction sealing structure

Abstract

The utility model discloses a post-cast strip pressure reduction sealing structure which comprises a post-cast strip cushion layer. The post-cast strip cushion layer comprises a bottom layer and a bottom plate concrete layer; the sealing structure is used for sealing the post-cast strip cushion layer; the closed structure comprises a notch, a water collecting well and a steel pipe, the water collecting well is located at the bottom of the post-cast strip cushion layer and corresponds to the notch, the water collecting well is filled with a graded sand gravel layer, and the steel pipe is embedded in the position, located in the graded sand gravel layer, in the water collecting well; multiple sets of holes are formed in the outer wall of the section, located in the grading sand gravel layer, of the steel pipe at equal intervals, the upper end of the steel pipe extends to the position above the bottom plate concrete layer, a flange is installed at the upper end of the steel pipe and used for being connected with a downcast pipe, and a valve is installed on the downcast pipe. By arranging the sealing structure, the influence of underground water on the concrete mix proportion in the post-cast strip sealing process is greatly reduced, the construction quality of the concrete post-cast strip is guaranteed, and the water seepage phenomenon is reduced.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a post-cast strip pressure-reducing and sealing structure. Background Technology

[0002] With the continuous development of my country's social economy and the accelerating pace of urbanization, urban construction land is decreasing year by year, making the increased development and utilization of underground space an inevitable trend. As the depth and scale of underground structures continue to increase, the impact of groundwater on building construction is also growing, making the sealing of post-cast strips in underground sections a key concern in the construction field. Underground spaces have a wide range of applications, including underground parking garages, civil defense projects, urban subways, and underground shopping malls. To ensure the functionality and construction quality of underground spaces, the sealing quality of post-cast strips directly affects their functionality and structural safety, negatively impacting project quality if problems arise.

[0003] Research on the sealing of post-cast strips in underground structures has significant practical value for engineering construction. Currently, incidents of basement seepage and post-cast strip seepage occur frequently across the country. A considerable number of these accidents are caused by: the high pressure of groundwater during the sealing process, leading to the loss of cement paste and insufficient compaction of the concrete structure; insufficient adhesion between the later-cast concrete and the earlier-cast concrete, resulting in the concrete bearing groundwater pressure before reaching the design strength; and excessive groundwater pressure (due to weather events such as heavy rain causing the groundwater level to rise and increasing groundwater pressure). Therefore, we need to propose a pressure-reducing sealing structure for post-cast strips. Utility Model Content

[0004] The purpose of this utility model is to provide a pressure-reducing and sealing structure for post-pouring strips. By setting up a sealing structure, it can not only be used as a drainage device during construction, but also as an auxiliary pressure-reducing device for sealing post-pouring strips, as a pressure-reducing device for leakage treatment, and as a pressure relief device during use. This greatly reduces the impact of groundwater on the concrete mix ratio during the sealing process of post-pouring strips, ensures the construction quality of concrete post-pouring strips, and reduces water seepage, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A post-cast strip pressure-reducing and sealing structure, comprising:

[0007] Post-cast strip cushion layer;

[0008] The post-cast strip cushion layer includes a bottom layer and a bottom slab concrete layer, wherein the bottom layer is located at the bottom of the bottom slab concrete layer;

[0009] It also includes a sealing structure for sealing the post-cast strip cushion layer;

[0010] The closed structure includes a notch, a water collection well, and a steel pipe. The notch penetrates the post-cast strip cushion layer. The water collection well is located at the bottom of the post-cast strip cushion layer and is set corresponding to the notch. The water collection well is filled with a layer of graded sand and gravel. A steel pipe is buried in the water collection well within the layer of graded sand and gravel. A filling layer is set in the notch to bury the steel pipe.

[0011] The steel pipe has multiple sets of holes at equal intervals on the outer wall of a section located within the graded gravel layer. The upper end of the steel pipe extends above the bottom concrete layer, and a flange is installed at the upper end of the steel pipe for connecting to the dewatering pipe, which is equipped with a valve.

[0012] Preferably, the bottom layer includes a C15 plain concrete cushion layer and a building waterproof layer, with C15 plain concrete cushion layers provided on both the upper and lower sides of the building waterproof layer.

[0013] Preferably, geotextile is wound around the outer wall of a section of the steel pipe located within the graded gravel layer. The geotextile is used to prevent external mud and sand from entering the holes on the outer wall of the steel pipe and causing blockage.

[0014] Preferably, the filling layer includes a permeable concrete layer and a shrinkage-compensating concrete layer. The permeable concrete layer is located directly above the water collection well and is flush with the bottom layer, while the shrinkage-compensating concrete layer is located directly above the permeable concrete layer and is flush with the bottom slab concrete layer.

[0015] Preferably, a water-stop steel plate is provided on the inner wall of the notch at the middle of the bottom concrete layer, and a water-stop plate is provided on the steel pipe, with the water-stop plate and the water-stop steel plate being flush.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model, by setting a closed structure, can not only be used as a drainage device during construction, but also as an auxiliary pressure-reducing device for sealing post-pouring strips, as a pressure-reducing device for leakage treatment, and as a pressure relief device during use. It greatly reduces the impact of groundwater on the concrete mix ratio during the sealing of post-pouring strips, ensures the construction quality of concrete post-pouring strips, and reduces water seepage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Base layer; 101. C15 plain concrete subbase; 102. Waterproofing layer.

[0020] 2. Sump well; 3. Graded gravel layer; 4. Steel pipe; 5. Hole; 6. Permeable concrete layer; 7. Base slab concrete layer; 8. Water-stop steel plate; 9. Water-stop plate; 10. Notch; 11. Flange; 12. Dewatering pipe; 13. Valve; 14. Shrinkage-compensating concrete layer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 This utility model provides a technical solution:

[0023] A post-cast strip pressure-reducing and sealing structure, comprising:

[0024] Post-cast strip cushion layer; the post-cast strip cushion layer includes bottom layer 1 and bottom slab concrete layer 7, bottom layer 1 is located at the bottom of bottom slab concrete layer 7; bottom layer 1 includes C15 plain concrete cushion layer 101 and building waterproof layer 102, and C15 plain concrete cushion layer 101 is provided on both the upper and lower sides of building waterproof layer 102.

[0025] It also includes a sealing structure for sealing the post-cast strip cushion layer; the sealing structure includes a notch 10, a water collection well 2 and a steel pipe 4. The notch 10 penetrates the post-cast strip cushion layer, the water collection well 2 is located at the bottom of the post-cast strip cushion layer and is set corresponding to the notch 10. The water collection well 2 is filled with a graded gravel layer 3, and the steel pipe 4 is buried in the graded gravel layer 3 in the water collection well 2. The notch 10 is filled with a filling layer to bury the steel pipe 4.

[0026] The outer wall of the steel pipe 4 located in the graded gravel layer 3 has multiple sets of holes 5 at equal intervals. The upper end of the steel pipe 4 extends above the bottom concrete layer 7, and a flange 11 is installed on the upper end of the steel pipe 4 for connecting the dewatering pipe 12. A valve 13 is installed on the dewatering pipe 12.

[0027] Geotextile is wrapped around the outer wall of a section of the steel pipe 4 located within the graded gravel layer 3. The geotextile is used to prevent external mud and sand from entering and clogging the holes 5 on the outer wall of the steel pipe 4. The filling layer includes a permeable concrete layer 6 and a shrinkage-compensating concrete layer 14. The permeable concrete layer 6 is located directly above the sump 2 and is flush with the bottom layer 1. The shrinkage-compensating concrete layer 14 is located directly above the permeable concrete layer 6 and is flush with the bottom slab concrete layer 7. A water-stop steel plate 8 is installed on the inner wall of the notch 10 in the middle of the bottom slab concrete layer 7. A water-stop plate 9 is installed on the steel pipe 4, and the water-stop plate 9 is flush with the water-stop steel plate 8.

[0028] In actual construction, a water collection well 2 is set at the bottom of the post-cast strip cushion layer, filled with graded sand and gravel, and a steel pipe 4 is buried (the buried sand and gravel part is drilled, and geotextile is wrapped around the drilled position to prevent mud and sand). The permeable concrete cover is then poured on the top of this part. According to the design height, a water-stop plate 9 is set on the steel pipe 4 at the position of the water-stop steel plate 8 in the middle of the bottom slab concrete layer 7 to position it at the cushion layer position. A flange 11 is set on the steel pipe 4 at the top of the bottom slab concrete layer 7 to connect the dewatering pipe 12 (or sealing plate), which can connect the dewatering pipe 12 and dewatering facilities. It can be used for dewatering during construction, dewatering when closing the post-cast strip, and depressurization after the post-cast strip.

[0029] Specifically, this structure integrates multiple functions such as drainage during construction, pressure reduction through sealing of post-cast strips, pressure reduction for leakage treatment, and pressure relief during use. Its functions can be flexibly adjusted according to different construction stages and usage requirements, making it highly adaptable and providing strong protection for waterproofing and structural stability throughout the entire life cycle of the project.

[0030] The subsequent construction process for sealing the post-cast strip involves roughening, rinsing, brushing, pouring, and vibrating the concrete for the post-cast strip of the base slab.

[0031] After the concrete of the post-cast strip is poured, depending on the groundwater pressure, you can choose to seal the pipe by reverse grouting or reserve it for later pressure relief.

[0032] After the concrete of the post-cast strip is poured, the reverse grouting can be flexibly selected to close the pipeline according to the groundwater pressure, or the pipeline can be reserved to connect the pressure gauge and valve 13 for automatic or manual pressure relief. This provides a variety of effective solutions for basements to cope with changes in groundwater pressure at different stages, ensuring the stability and safety of basements in long-term use.

[0033] In practical use, this structure is used for dewatering during construction, dewatering during the construction of the post-cast strip, and groundwater depressurization during use. Continuous dewatering during the sealing of the post-cast strip effectively reduces groundwater pressure, allowing the post-cast strip concrete to be poured without water pressure or flow. After the post-cast strip is poured, groundwater is continuously reduced until the concrete strength reaches the design requirements, at which point dewatering is gradually stopped. Simultaneously, after dewatering stops, the basement floor slab and post-cast strip are observed for leakage during the rainy season. Problems can be addressed while groundwater is reduced; after addressing the issues, dewatering is stopped again, and observation continues until no leakage occurs. Depending on the groundwater pressure, 12 dewatering pipes can be sealed by reverse grouting underground, concealed during floor construction; or pressure gauges and valves can be connected for automatic or manual depressurization to prevent excessive groundwater pressure from causing leakage or damage to the floor slab later.

[0034] Advantages of this solution compared to traditional solutions:

[0035] Basements typically lack pressure relief and drainage structures. During the pouring of post-cast concrete, abundant groundwater carries away some of the cement paste, increasing the water-cement ratio and altering the concrete mix proportions, thereby reducing the concrete's strength and density. After the concrete is poured, it is immediately subjected to groundwater pressure, and with the concrete's strength and density affected, it is highly susceptible to water seepage.

[0036] This structure can be used not only as a drainage device during construction, but also as an auxiliary pressure-reducing device for sealing post-cast strips, a pressure-reducing device for leakage control, and a pressure relief device during use. This structure greatly reduces the impact of groundwater on the concrete mix ratio during the sealing of post-cast strips, ensuring the construction quality of the concrete post-cast strips and reducing seepage.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A post-cast strip pressure-reducing and sealing structure, characterized in that, include: Post-cast strip cushion layer; The post-cast strip cushion layer includes a bottom layer (1) and a bottom slab concrete layer (7), wherein the bottom layer (1) is located at the bottom of the bottom slab concrete layer (7); It also includes a sealing structure for sealing the post-cast strip cushion layer; The closed structure includes a notch (10), a water collection well (2), and a steel pipe (4). The notch (10) penetrates the post-cast strip cushion layer. The water collection well (2) is located at the bottom of the post-cast strip cushion layer and is set corresponding to the notch (10). The water collection well (2) is filled with a graded gravel layer (3). The steel pipe (4) is buried in the graded gravel layer (3) inside the water collection well (2). A filling layer is set in the notch (10) to bury the steel pipe (4). The steel pipe (4) has multiple sets of holes (5) equidistantly opened on the outer wall of a section of graded gravel layer (3). The upper end of the steel pipe (4) extends above the bottom concrete layer (7), and a flange (11) is installed on the upper end of the steel pipe (4) for connecting the dewatering pipe (12). A valve (13) is installed on the dewatering pipe (12).

2. The post-cast strip pressure-reducing and sealing structure according to claim 1, characterized in that: The bottom layer (1) includes a C15 plain concrete cushion layer (101) and a building waterproof layer (102), with C15 plain concrete cushion layers (101) provided on both the upper and lower sides of the building waterproof layer (102).

3. The post-cast strip pressure-reducing and sealing structure according to claim 1, characterized in that: The outer wall of the steel pipe (4) located in the graded gravel layer (3) is wrapped with geotextile. The geotextile is used to prevent external mud and sand from entering the holes (5) on the outer wall of the steel pipe (4) and causing blockage.

4. The post-cast strip pressure-reducing and sealing structure according to claim 1, characterized in that: The filling layer includes a permeable concrete layer (6) and a shrinkage-compensating concrete layer (14). The permeable concrete layer (6) is located directly above the water collection well (2) and is flush with the bottom layer (1). The shrinkage-compensating concrete layer (14) is located directly above the permeable concrete layer (6) and is flush with the bottom slab concrete layer (7).

5. The post-cast strip pressure-reducing and sealing structure according to claim 1, characterized in that: The inner wall of the notch (10) is provided with a water-stop steel plate (8) in the middle of the bottom concrete layer (7), and a water-stop plate (9) is provided on the steel pipe (4), with the water-stop plate (9) and the water-stop steel plate (8) being flush.

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