Water stop structure for construction joint of basement bottom plate and underground diaphragm wall
By setting up multiple water stop protection lines at the construction joints of the basement floor and the underground continuous wall, including thickened bottom plates, water-expanded water stop glue strips, grouting devices and water stop steel plates, the problem of groundwater leakage is solved and the long-term low leakage rate waterproof effect is achieved.
Patent Information
- Application Number
- CN202421825094.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The construction joints between the basement floor and the underground continuous wall are prone to leakage due to groundwater pressure, and the prior art is difficult to effectively prevent leakage.
Multiple water stop protection lines are set up at the construction joints, including thickened bottom plates, water-expanded water stop glue strips, grouting devices, water stop steel plates, cement-based permeable crystallizers, etc., and combined with drainage ditches and steel bar connectors, a multi-layer waterproof structure is formed.
Effectively delay the flow path of leaky water, improve grouting effectiveness, prevent thermal expansion and contraction damage, ensure that no repair is required within many years, and achieve a waterproof effect with low leakage rate.
Smart Images
Figure CN223305065U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of underground construction, in particular to a water-stopping structure used for a construction joint between a basement floor and an underground continuous wall. Background Art
[0002] Underground diaphragm walls are a common form of foundation pit enclosure. To achieve greater economic efficiency and conserve construction land, a design often combines the underground diaphragm wall with the basement's exterior wall. This creates a longitudinal construction joint between the basement floor and the underground diaphragm wall, which can easily lead to water leakage due to groundwater pressure. This utility model proposes an effective water-stopping structure to address this issue. Utility Model Content
[0003] In order to solve the problems existing in the prior art, the utility model proposes a water-stopping structure at the construction joint of the basement floor and the inner wall under the design of the basement outer wall and the underground continuous wall as two walls are integrated into one.
[0004] The technical solution of the utility model is as follows:
[0005] A water-stopping structure for a construction joint between a basement floor and an underground continuous wall, comprising an underground continuous wall and a basement floor, characterized in that:
[0006] The basement floor is thickened near the underground continuous wall to form a thickened floor area; a first water-swelling water-stopping strip is provided at the connection between the thickened floor area and the underground continuous wall as the first water-stopping line;
[0007] A grouting device is provided above the first water-swellable waterstop strip, and grouting is injected into the construction joint through the grouting device to fill it as a second waterstop line;
[0008] A second water-swelling water-stopping rubber strip is provided above the grouting device as a third water-stopping line of defense;
[0009] A waterstop steel plate is provided above the second water-swelling waterstop strip as the fourth waterstop line;
[0010] A third water-swelling water-stop rubber strip is provided above the water-stop steel plate as the fifth water-stop line of defense;
[0011] Above the third water-swelling waterstop strip, a cement-based penetrating crystallization agent coating is provided at the connection between the basement floor and the underground continuous wall, serving as the sixth waterstop line of defense.
[0012] Furthermore, a first row of steel bar connectors is provided in the thickened area at the bottom of the basement floor, which is mechanically connected to the steel bars at the corresponding positions of the underground continuous wall through the first row of steel bar connectors; a second row of steel bar connectors is provided on the upper part of the basement floor, which is mechanically connected to the steel bars at the corresponding positions of the underground continuous wall through the second row of steel bar connectors.
[0013] Furthermore, a reinforced concrete flange wall is provided on the top of the basement floor, a drainage ditch is formed between the reinforced concrete and the underground continuous wall, and a drainage slope is set in the drainage ditch, preferably, a slope of 3%.
[0014] Furthermore, the grouting device includes a grouting pipe, a grouting conduit, a connecting pipe and a connecting plate. The grouting pipe is arranged horizontally along the construction joint, and dense holes are set on the upper part of the grouting pipe. The grouting conduit is connected to the grouting pipe through the connecting pipe. The connecting plate clamp is set on the grouting pipe for connecting to the underground continuous wall or basement floor.
[0015] Furthermore, the grouting pipe is staggered in sections, and the length of each section is 500 to 600 cm.
[0016] Furthermore, the waterstop steel plate is T-shaped and has foamed styrene embedded therein to prevent the waterstop steel plate from being damaged due to thermal expansion and contraction of the basement floor.
[0017] Furthermore, the bottom plate thickening area is set to 300-400 mm.
[0018] Furthermore, a drainage hole is set every 30-50m at the root of the reinforced concrete flange wall to drain the leaking water in the drainage ditch; the purpose is to drain the leaking water in the drainage ditch through the drainage hole at the root of the wall to the water collection well in the basement and then pump it out.
[0019] Furthermore, the underground continuous wall faces the soil surface with a TRD channel-type cement-soil mixing wall, and a triaxial cement-soil mixing pile is driven below the junction of the underground continuous wall and the basement floor.
[0020] The beneficial effects of the utility model are as follows:
[0021] 1) Thickening the basement floor slab edge beams at the junction of the basement floor and the diaphragm wall increases the length of the construction joint, thereby lengthening the flow path of seepage water and effectively delaying water infiltration. Thickening the basement floor slab edge beams at the junction also effectively increases the stiffness of the joint between the basement floor and the diaphragm wall, preventing further expansion of the construction joint due to inconsistent settlement between the basement and the diaphragm wall.
[0022] 2) The segmented design of the grouting pipe ensures pressure balance within the pipe, improves grouting effectiveness, and allows the slurry to penetrate the tiny gaps in the construction joint more effectively. It also prevents local grouting pipe damage or blockage that could lead to failure of the entire grouting process.
[0023] 3) The waterstop steel plate is embedded with foamed styrene, which can effectively prevent the T-shaped waterstop baffle from being damaged due to thermal expansion and contraction of the large base plate.
[0024] 4) The underground continuous wall faces the soil with a TRD channel-type cement-soil mixing wall. Triaxial cement-soil mixing piles are driven below the junction of the underground continuous wall and the basement floor. Both the cement-soil mixing wall and the cement-soil mixing piles have excellent water-stopping functions and can achieve a water-stopping effect within a certain period of time to prevent the intrusion of seepage water. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0026] Figure 2 This is a structural diagram of a grouting device of the present utility model;
[0027] Figure 3 This is a schematic diagram of the structure of the water-stop steel plate of the utility model;
[0028] Figure 4 This is a schematic structural diagram of the water-expanding waterstop strip of the utility model;
[0029] In the figure: 1. First row of steel bar connectors; 2. First water-swelling waterstop strip; 3. Grouting device; 301. Grouting pipe; 302. Grouting conduit; 303. Connecting pipe; 304. Connecting piece; 4. Second water-swelling waterstop strip; 5. Waterstop steel plate; 6. Third water-swelling waterstop strip; 7. Cement-based penetrating crystallization agent coating; 8. Second row of steel bar connectors; 9. Drainage ditch; 10. Reinforced concrete flange wall; 11. Basement floor; 12. Floor thickening area; 13. Underground continuous wall. DETAILED DESCRIPTION
[0030] The present invention will be further described below with reference to the accompanying drawings.
[0031] like Figure 1 As shown, a water-stopping structure for the construction joint between the basement floor and the underground continuous wall, the structure includes from bottom to top a floor thickening area 12, a first row of steel bar connectors 1, a first water-swelling waterstop strip 2, a grouting device 3, a second water-swelling waterstop strip 4, a waterstop steel plate 5, a third water-swelling waterstop strip 6, a cement-based penetrating crystallization agent coating, a second row of steel bar connectors 8, a drainage ditch 9, and a reinforced concrete flange wall 10.
[0032] The base plate thickening area 12 (concrete thickening) should be set to 300-400mm, which can increase the length of the construction joint at the connection between the basement base plate and the underground continuous wall, extending the path of groundwater leakage and circulation; and place the first 50*80mm water-expanding waterstop strip 2 and grouting device 3 in this area.
[0033] The first row of steel bar connectors 1 is used for mechanical connection of the main reinforcement at the bottom of the basement floor thickening area 12 of the basement floor 13, thereby strengthening the quality of the steel bar connection between the underground continuous wall 13 and the basement floor 11, making the rigid connection between the underground continuous wall 13 and the basement floor 11 tighter, and effectively preventing the gap of the construction joint from further expanding.
[0034] The first 5*8cm water-swelling waterstop strip 1 is the first effective measure to prevent water seepage in the construction joint. The first 5*8cm water-swelling waterstop strip 1 is pre-buried in the lower part of the base plate thickening area 12, effectively blocking the flow path of groundwater before the groundwater reaches the bottom elevation range of the basement floor 11, and is the first line of defense to effectively prevent groundwater from leaking upward.
[0035] The grouting system 3 includes a grouting pipe 301, a grouting conduit 302, a connecting pipe 303, and a connecting piece 304. The grouting pipe 301 is arranged horizontally along the construction joint and is arranged in sections, with each section preferably being approximately 500-600 cm long. The upper portion of the grouting pipe 301 is provided with dense holes to facilitate the even overflow and filling of the grouting liquid into the construction joint. The grouting conduit 302 is connected to the horizontal grouting pipe and extends directly above the basement slab elevation, preferably 200 mm above the slab surface elevation, to facilitate pressure grouting after the basement slab is completed. Grouting should be performed within 3-7 days after the slab is constructed, after the concrete strength reaches at least 50% of the design strength. The grouting slurry should be cement mortar or epoxy resin grouting with a strength grade higher than that of the concrete slab. The grouting pressure should be controlled between 0.2-0.5 MPa. The grouting conduit should be removed after use. The connecting pipe 303 connects the grouting pipe 301 and the grouting conduit 302. The connecting piece 304 is clamped on the grouting pipe 301 for connecting with the underground continuous wall 13 and the basement floor 11. The function of the grouting device 3 is to fill the small gaps in the construction joint with grouting, which is the second line of defense to effectively prevent groundwater from leaking upwards.
[0036] The second 3*5cm water-swelling water-stopping strip 4 is a further measure to prevent groundwater leakage and is the third line of defense to effectively prevent groundwater from leaking upward.
[0037] The water-stop steel plate 5 is T-shaped and is welded from a 150X8mm ordinary steel plate and a 130X6mm steel plate. It is the fourth line of defense to effectively prevent groundwater from leaking upwards. Figure 3As shown), its function is to prevent the basement floor from expanding and contracting due to heat and cold, which may cause the node concrete to be squeezed and crushed. A certain amount of elastic space is reserved in advance to ensure that the T-shaped waterstop steel plate node remains intact for a long time.
[0038] The third 3*5cm water-swelling water-stopping strip 6 is a further measure to prevent groundwater leakage and is the fifth line of defense to effectively prevent groundwater from leaking upward.
[0039] Cement-based penetrating crystallization agent coating 7. Cement-based penetrating crystallization agent can effectively make the connection between the basement floor and the underground continuous wall construction joint tighter. It is a further measure to prevent groundwater from leaking upwards and is the sixth line of defense to effectively prevent groundwater from leaking upwards.
[0040] The second row of steel bar connectors 8 is used for mechanical connection of the main bars on the upper part of the basement floor, which strengthens the quality of the steel bar connection between the underground continuous wall 13 and the basement floor 11, makes the rigid connection between the underground continuous wall and the basement floor tighter, and effectively prevents the gap of the construction joint from further expanding.
[0041] The drainage ditch 9 is to drain the groundwater if it breaks through the multiple defense lines and penetrates the basement floor. The drainage ditch is set at a 3% slope to divert the leaking groundwater into the water collection well in the basement and is pumped away by a drainage pump.
[0042] The reinforced concrete flange wall 10 is used to prevent the leaking groundwater from flowing directly into the basement. During the construction of the reinforced concrete flange, it should be poured together with the basement concrete, and no horizontal construction joint should be left with the basement basement. A drainage hole is set every 30-50M at the root of the reinforced concrete flange wall to drain the leaking water in the drainage ditch. A solid partition wall is built on the reinforced concrete flange wall to serve as the inner wall of the basement.
[0043] Compared to existing technologies, this new design incorporates a sixth waterproofing measure, resulting in improved waterproofing and lower leakage rates over the life of the structure. Even if a small amount of water seepage occurs, repairs are unnecessary; open drainage through the drains solves the groundwater leakage problem, ensuring the normal use of the basement structure.
[0044] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.
Claims
1. A water-stopping structure for a construction joint between a basement floor and an underground continuous wall, comprising an underground continuous wall and a basement floor, characterized in that: The basement floor is thickened near the underground continuous wall to form a thickened floor area; a first water-swelling water-stopping strip is provided at the connection between the thickened floor area and the underground continuous wall as the first water-stopping line; A grouting device is provided above the first water-swelling waterstop strip, and grouting is injected into the construction joint through the grouting device to fill it as a second waterstop line; A second water-swelling water-stopping rubber strip is provided above the grouting device as a third water-stopping line of defense; A waterstop steel plate is provided above the second water-swelling waterstop strip as the fourth waterstop line; A third water-swelling water-stop rubber strip is provided above the water-stop steel plate as the fifth water-stop line of defense; A cement-based penetrating crystallization agent coating is provided above the third water-swelling water-stopping strip and at the connection between the basement floor and the underground continuous wall, serving as the sixth water-stopping line of defense.
2. A water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 1, characterized in that: The thickened bottom plate area at the bottom of the basement floor is provided with a first row of steel bar connectors, which are mechanically connected to the steel bars at the corresponding positions of the underground continuous wall through the first row of steel bar connectors; the second row of steel bar connectors on the upper part of the basement floor is mechanically connected to the steel bars at the corresponding positions of the underground continuous wall through the second row of steel bar connectors.
3. A water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 1, characterized in that: A reinforced concrete flanged wall is provided on the top of the basement floor, a drainage ditch is formed between the reinforced concrete and the underground continuous wall, and a drainage slope is provided in the drainage ditch.
4. A water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 1, characterized in that: The grouting device includes a grouting pipe, a grouting conduit, a connecting pipe and a connecting plate. The grouting pipe is arranged horizontally along the construction joint. Dense holes are provided on the upper part of the grouting pipe. The grouting conduit is connected to the grouting pipe through the connecting pipe. The connecting plate clamp is provided on the grouting pipe for connecting to the underground continuous wall or the basement floor.
5. A water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 4, characterized in that: The grouting pipe is staggered in sections, and the length of each section is 500 to 600 cm.
6. A water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 1, characterized in that: The waterstop steel plate is T-shaped and has foam styrene embedded therein to prevent the waterstop steel plate from being damaged due to thermal expansion and contraction of the basement floor.
7. A water-stopping structure for the construction joint between a basement floor and an underground continuous wall according to claim 1, characterized in that: The bottom plate thickening area is set to 300-400 mm.
8. The water-stopping structure for the construction joint between the basement floor and the underground continuous wall according to claim 3, characterized in that: A drainage hole is provided at the root of the reinforced concrete flange wall every 30-50 m to drain the leaked water in the drainage ditch.