CN212200440U - Water leakage prevention structure for bottom sealing concrete in deep and large foundation pit - Google Patents
Water leakage prevention structure for bottom sealing concrete in deep and large foundation pit Download PDFInfo
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- CN212200440U CN212200440U CN202020635336.6U CN202020635336U CN212200440U CN 212200440 U CN212200440 U CN 212200440U CN 202020635336 U CN202020635336 U CN 202020635336U CN 212200440 U CN212200440 U CN 212200440U
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- back cover
- concrete
- wall
- wall body
- foundation pit
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- 239000004567 concrete Substances 0.000 title claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000007789 sealing Methods 0.000 title claims abstract description 22
- 230000002265 prevention Effects 0.000 title claims abstract description 7
- 239000011440 grout Substances 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 18
- 238000007667 floating Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a water leakage prevention structure for back cover concrete in a deep and large foundation pit, which comprises a foundation pit, wherein a wall body and back cover concrete are arranged in the foundation pit, the wall body comprises a ground connecting wall and a bin dividing wall, and also comprises a shear resistant groove, and the shear resistant groove is arranged on the wall body and is connected with the back cover concrete; the grouting pipe is arranged on the outer wall of the wall body and used for injecting grout between the wall body and the bottom sealing concrete; grouting holes are uniformly formed in the grouting pipe; the shear groove of the utility model is reliably connected with the bottom sealing concrete, and the shear groove is used as an anti-seepage and water-stopping structure of the interface, thereby reducing the possibility of water seepage at the interface, namely the possibility of water seepage in the longitudinal direction of the foundation pit; meanwhile, the grout is conveyed to the connecting interface of the wall and the bottom sealing concrete through the grouting pipe, so that the possibility of water seepage in the transverse direction of the foundation pit is reduced; the utility model discloses simple structure, construction facility, construction cycle are short, construction cost is low, leak protection water is effectual.
Description
Technical Field
The utility model belongs to the technical field of the building engineering technique and specifically relates to a leak protection water structure that is used for back cover concrete in deep and big foundation ditch.
Background
With the continuous speed increase of urbanization pace, the problem of traffic congestion is increasingly highlighted, rail transit is used as an important way for relieving urban traffic pressure, a large development pattern is generated, two-line and multi-line transfer stations are more and more, and subway station foundation pits are gradually developed to be larger and deeper. The excavation depth of the subway foundation pit is continuously increased, underground water is more and more abundant, the water treatment difficulty is increased, and the underground water is an important factor influencing whether safe and smooth construction can be carried out in a subway station.
For the precipitation treatment of high-pressure-bearing permeable stratums and deep and large foundation pits, a large amount of underground water needs to be pumped and drained for a long time, so that the damages such as ground settlement and instability of surrounding building structures are easily caused, and underground water resources are seriously wasted. Generally, the curtain is used for intercepting water and the base is combined for reinforcing and stopping water, the reinforcing and water stopping effect is difficult to guarantee, and the required construction period and the required construction cost are high. For the subway deep foundation pit in the high-pressure-bearing permeable stratum, the underground water cannot be effectively controlled by common water treatment measures, and underground water treatment measures of combining a waterproof curtain with an underwater concrete back cover are required. However, the waterproof curtain is not tightly attached to the interface of the underwater back cover concrete, and water leakage is inevitable.
At present, the treatment measures for water leakage are mainly as follows: and (3) plugging water leakage points at the junction of the waterproof curtain and the bottom sealing concrete, wherein the main modes for plugging the water leakage points are gap filling and grouting plugging. If gap filling is adopted, the interface of the water interception curtain and the bottom sealing concrete has more water leakage points, and the water leakage problem can not be thoroughly solved only by temporary plugging; if adopt the slip casting shutoff, can destroy the overall structure of back cover concrete and influence foundation ditch safety and the anti effect of floating at the bottom of the hole. Therefore, the water leakage treatment measures cannot effectively treat water leakage and can affect the foundation pit and the bottom sealing concrete.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the technical problem of percolating water between stagnant water curtain and the back cover concrete in the high pressure-bearing permeable stratum and provide a leak protection water structure that is used for back cover concrete in the deep and big foundation ditch.
The utility model adopts the technical proposal that: a leak protection water structure for back cover concrete in deep and big foundation ditch, including the foundation ditch, be provided with wall body and back cover concrete in the foundation ditch, the wall body includes the ground even wall and divides the storehouse wall, still includes:
the shear resistant groove is arranged on the wall body and is connected with the bottom sealing concrete;
the grouting pipe is arranged on the outer wall of the wall body and used for injecting grout between the wall body and the bottom sealing concrete;
and grouting holes are uniformly formed in the grouting pipe.
The shear groove is arranged on the wall body, when the back cover concrete is poured, the back cover concrete flows into the shear groove, so that the shear groove is reliably connected with the back cover concrete, and the shear groove is used as an anti-seepage water stop structure of an interface, thereby reducing the possibility of water seepage of the interface, namely the possibility of water seepage in the longitudinal direction of a foundation pit; meanwhile, the grout is conveyed to the connecting interface of the wall and the bottom sealing concrete through the grouting pipe, so that the possibility of water seepage in the transverse direction of the foundation pit is reduced; the utility model discloses simple structure, construction facility, construction cycle are short, construction cost is low, leak protection water is effectual.
Furthermore, a graded gravel layer is arranged on the upper portion of the bottom sealing concrete, so that the weight of the bottom sealing concrete is increased, and the anti-floating safety degree of the pit bottom is increased.
Further, a water collecting pit and a blind pipe are arranged in the graded broken stone layer, underground water in the graded broken stone layer can be collected by the water collecting pit, and the underground water in the water collecting pit can be extracted by external pumping equipment through the blind pipe, so that the waterless operation environment of construction is ensured.
Further, the upper portion of gradation rubble layer sets up the bed course, and the bed course is used for making level to the back cover concrete, and increases back cover concrete counter weight and increases the anti safety degree of floating of pit bottom, also can not destroy back cover concrete simultaneously.
Furthermore, the cushion layer is made of reinforced concrete, so that the construction period is short, and the stabilization effect is good.
Furthermore, the main reinforcement is arranged in the wall body, the shear groove is a channel steel, and the channel steel is connected with the main reinforcement in a welding mode, so that the connection stability of the channel steel can be improved.
Furthermore, the outer wall of the wall body is provided with a positioning cushion block, and the grouting pipe is connected with the positioning cushion block in a welding mode, so that the connection stability of the grouting pipe can be improved.
The utility model has the advantages that:
1. the shear groove of the utility model is reliably connected with the back cover concrete, and the shear groove is used as an anti-seepage and water-stopping structure of the interface, thus reducing the possibility of water seepage at the interface; meanwhile, slurry is conveyed to a connecting interface of the wall body and the bottom sealing concrete through a grouting pipe; the possibility of water seepage is reduced from the longitudinal direction and the transverse direction of the foundation pit; just the utility model discloses simple structure, construction facility, construction cycle are short, construction cost is low, leak protection water is effectual.
2. The graded crushed stone layer and the cushion layer of the utility model can increase the back cover concrete balance weight and increase the anti-floating safety degree of the pit bottom; meanwhile, the water collecting pit in the graded broken stone layer can ensure the waterless operation environment of construction, and meanwhile, the bottom sealing concrete cannot be damaged.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a partially enlarged view of the partition wall.
Fig. 3 is a partially enlarged view of the diaphragm wall.
FIG. 4 is a schematic view of the connection of the shear groove.
Fig. 5 is a schematic structural view of the grout pipe.
Labeled as:
1. a wall body; 2. sealing bottom concrete; 3. a grouting pipe; 4. grading a crushed stone layer; 5. a cushion layer; 6. a subway station;
11. a ground connecting wall; 12. a bin dividing wall; 13. a shear resistant groove; 14. a main rib; 15. positioning a cushion block; 31. and (4) grouting holes.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example (b):
as shown in fig. 1-5, the utility model discloses a leak protection water structure for back cover concrete in deep and big foundation ditch, including the foundation ditch, be provided with wall body 1 and back cover concrete 2 in the foundation ditch, wall body 1 includes ground even wall 11 and branch storehouse wall 12, still includes: the shear groove 13 is arranged on the wall body 1 and is connected with the back cover concrete 2; the grouting pipe 3 is arranged on the outer wall of the wall body 1 and used for injecting grout between the wall body and the bottom sealing concrete; grouting holes 31 are uniformly arranged on the grouting pipe 3.
As shown in fig. 1, in order to increase the weight of the back cover concrete and increase the safety of the pit bottom against floating without destroying the back cover concrete, a graded gravel layer 4 is provided on the back cover concrete 2.
In order to ensure a water-free working environment for construction, a water collecting pit (not shown) and a blind pipe (not shown) are arranged in the graded broken stone layer 4. The sump can collect the groundwater in the graded broken stone layer, and external pumping equipment can pump the groundwater in the sump through the blind pipe
As shown in fig. 1, in order to level the bottom sealing concrete, increase the weight of the bottom sealing concrete and increase the anti-floating safety of the pit bottom, a cushion layer 5 is arranged on the upper part of the graded crushed stone layer 4; the cushion layer 5 is made of reinforced concrete.
As shown in fig. 4, in order to improve the stability of the connection of the channel steel, a main bar 14 is arranged in the wall 1, the shear groove 13 is a channel steel, and the channel steel is connected with the main bar 14 in a welding manner.
As shown in fig. 2, in order to improve the stability of the connection of the grouting pipes, a positioning cushion block 15 is arranged on the outer wall of the wall 1, and the grouting pipes 3 are connected with the positioning cushion block 15 in a welding manner.
The construction steps are as follows:
s1, casting a diaphragm wall and a branch bin wall in the foundation pit, embedding channel steel in the diaphragm wall and the branch bin wall to form a shear resistant groove, and connecting the channel steel with main ribs in the wall body in a welding mode; simultaneously, a grouting pipe and a positioning cushion block are pre-embedded, and the grouting pipe is connected with the positioning cushion block in a welding mode; the anti-shearing groove is filled with the foam board, so that concrete can be prevented from entering the anti-shearing groove during pouring;
s2, after the wall body is stably poured, the diver removes the foam board in the shear groove, and pours the back cover concrete, and the back cover concrete flows into the shear groove, so that the reliable connection between the shear groove and the back cover concrete is ensured;
s3, grouting slurry to the connection interface of the bottom sealing concrete and the wall through a grouting pipe, wherein the slurry is a mixture of water and cement, and the possibility of water seepage in the transverse direction of the foundation pit is reduced;
s4, filling a graded gravel layer on the upper part of the bottom sealing concrete, arranging a water collecting pit and a blind pipe in the graded gravel layer, and pumping underground water in the water collecting pit by external pumping equipment through the blind pipe to ensure a construction waterless operation environment;
s5, arranging a cushion layer on the upper part of the graded crushed stone layer, wherein the cushion layer is used for leveling the bottom-sealed concrete, increasing the weight of the bottom-sealed concrete and the anti-floating safety of the pit bottom, and meanwhile, the bottom-sealed concrete cannot be damaged;
and S6, finally, constructing the subway station.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A leak protection water structure for back cover concrete in deep and big foundation ditch, including the foundation ditch, be provided with wall body (1) and back cover concrete (2) in the foundation ditch, wall body (1) is including ground even wall (11) and branch storehouse wall (12), its characterized in that still includes:
the shear resistant groove (13) is arranged on the wall body (1) and is connected with the back cover concrete (2);
the grouting pipe (3) is arranged on the outer wall of the wall body (1) and used for injecting grout between the wall body and the bottom sealing concrete;
grouting holes (31) are uniformly arranged on the grouting pipe (3).
2. The water leakage preventing structure for the back cover concrete in the deep and large foundation pit according to claim 1, wherein the upper portion of the back cover concrete (2) is provided with a graded crushed stone layer (4).
3. The water leakage prevention structure for the back cover concrete in the deep and large foundation pit according to claim 2, wherein a water collecting pit and a blind pipe are arranged in the graded crushed stone layer (4).
4. The water leakage preventing structure for the back cover concrete in the deep and large foundation pit according to claim 2, wherein the upper part of the graded gravel layer (4) is provided with a cushion layer (5).
5. The water leakage prevention structure for the inside back cover concrete of a deep and large foundation pit as claimed in claim 4, wherein said bedding layer (5) is reinforced concrete.
6. The water leakage prevention structure for the back cover concrete in the deep and large foundation pit according to claim 1, wherein a main reinforcement (14) is arranged in the wall body (1), the shear groove (13) is a channel steel, and the channel steel is connected with the main reinforcement (14) in a welding manner.
7. The water leakage prevention structure for the back cover concrete in the deep and large foundation pit according to claim 1, characterized in that the outer wall of the wall body (1) is provided with a positioning cushion block (15), and the grouting pipe (3) is connected with the positioning cushion block (15) in a welding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020635336.6U CN212200440U (en) | 2020-04-24 | 2020-04-24 | Water leakage prevention structure for bottom sealing concrete in deep and large foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020635336.6U CN212200440U (en) | 2020-04-24 | 2020-04-24 | Water leakage prevention structure for bottom sealing concrete in deep and large foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212200440U true CN212200440U (en) | 2020-12-22 |
Family
ID=73828120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020635336.6U Active CN212200440U (en) | 2020-04-24 | 2020-04-24 | Water leakage prevention structure for bottom sealing concrete in deep and large foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212200440U (en) |
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2020
- 2020-04-24 CN CN202020635336.6U patent/CN212200440U/en active Active
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