Water-stop curtain composite support structure
By employing a water-stop curtain structure with alternating front and rear rows of piles in deep foundation pit engineering, combined with high-pressure jet grouting piles and inclined connecting beams to form a triangular stable system, the problem of easy leakage of traditional water-stop curtains is solved, and the safety, stability and economical support of the foundation pit are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA SHANXI SIJIAN GRP
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-14
AI Technical Summary
In deep foundation pit engineering, traditional water-stop curtains are prone to leakage, which leads to an increase in water inflow and seepage channels in the foundation pit, making it difficult to meet seepage prevention requirements and increasing project costs.
The system employs alternating front and rear rows of piles, combined with high-pressure jet grouting piles to form a continuous water-stopping curtain. A triangular stabilizing system is then formed through cap beams and inclined connecting beams to enhance shear resistance and overall strength, thereby blocking seepage paths.
It achieves the integration of support and water stoppage, reduces seepage channels, enhances shear resistance, improves overall strength and joint strength, reduces local stress, and ensures the safety and stability of the foundation pit.
Smart Images
Figure CN224495154U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation pit support technology, and more specifically, to a water-stop curtain composite support structure. Background Technology
[0002] New and expanded building foundation pit projects are basically deep foundation pit projects. The red line of the proposed building and the outer edge of the foundation pit are adjacent to municipal roads or existing buildings. Therefore, the support structure of the foundation pit of the proposed building cannot adopt the conventional anchor-type cast-in-place pile support structure. Under the premise of ensuring the safety and stability of the foundation pit, how to meet the seepage prevention requirements of the foundation pit and reduce the cost of the foundation pit project has become a problem to be solved for similar foundation pit projects at this stage.
[0003] Traditional water-stopping curtains often employ single high-pressure jet grouting piles or mixing piles. In water-rich strata, leakage is prone to occur at the pile joints, leading to accidents such as water inrush and piping in the foundation pit. Furthermore, the separate installation of the front support piles and the water-stopping curtain creates a seepage channel between them, increasing the difficulty of dewatering. Therefore, a composite support structure for the water-stopping curtain is proposed. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a water-stop curtain composite support structure to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a water-stop curtain composite support structure, comprising a front row of piles and a rear row of piles set in the foundation pit. The front row of piles ensures that the pile body effectively transmits lateral earth pressure. High-pressure jet grouting piles are set in the middle gap of the front row of piles. Through the high-pressure jet grouting piles, a continuous water-stop curtain can be formed. The two are arranged alternately to realize the integration of support and water-stopping, reducing seepage channels. A row of piles with the same length as the front row of piles is set on the side of the front row of piles close to the rear row of piles to enhance the shear resistance of the front row structure and serve as a supplement to the water-stop curtain to further block the seepage path. The space between the front row of piles and the rear row of piles is filled with foundation pit wall soil.
[0006] Both the front and rear rows of piles are topped with cap beams, which are cast on top of the piles to convert the force on a single pile into the force on the whole pile. The top of the cap beams is provided with multiple first and second inclined connecting beams. Multiple stabilizing mechanisms are set between the front and rear rows of piles. The first and second inclined connecting beams cross and connect the front and rear cap beams to form a triangular stabilizing system, which works together to resist horizontal loads. All three are cast in one go to ensure the strength of the joint. The stabilizing mechanisms can limit the displacement of the front and rear rows of piles and improve the support strength.
[0007] Preferably, the spacing between the front row piles is set to 1.5-2 times the pile diameter, the pile length of the front row piles is set to 1.5-2 times the depth of the foundation pit, and the pile diameters of the front row piles and the rear row piles are the same. The front row piles can ensure that the pile body effectively transmits lateral earth pressure.
[0008] Preferably, the spacing between the rear piles is set to 1.5-2 times the pile diameter, the length of the rear piles is set to 2-2.5 times the depth of the foundation pit, and the spacing between the front and rear piles is set to 2-2.5 times the pile diameter, so that the rear piles provide sufficient tensile strength and overturning moment.
[0009] Preferably, the high-pressure jet grouting piles are tightly interlocked, and the pile diameter is set to 0.5-1 times the diameter of the front row of piles. The high-pressure jet grouting piles and the piles in the row have the same diameter, and the length of both the high-pressure jet grouting piles and the piles in the row are the same as the length of the front row of piles. The high-pressure jet grouting piles fill the gaps between the front row of piles to form a continuous water-stop curtain. The two are arranged alternately to achieve the integration of support and water-stopping, reduce seepage channels, and enhance the shear resistance of the front structure through the piles in the row, and further block the seepage path as a supplement to the water-stop curtain.
[0010] Preferably, the front and rear rows of piles are connected and fixed by a first and a second inclined beam. The first and second inclined beams are intersecting. The width of the cap beam, the first inclined beam, and the second inclined beam is not less than the diameter of the front row of piles. The height of the cap beam, the first inclined beam, and the second inclined beam is not less than 0.6 times the width of the beam. The cap beam, the first inclined beam, and the second inclined beam are cast in one go. The cap beam transforms the force of a single pile into the force of the whole structure. The first and second inclined beams intersect and connect the front and rear cap beams to form a triangular stable system that works together to resist horizontal loads. All three are cast in one go to ensure the strength of the joint.
[0011] Preferably, the stabilizing mechanism includes a second support plate and two first support plates disposed on opposite sides of the front and rear rows of piles. A connecting rod and a support diagonal rod are fixedly connected between the second support plate and the first support plates. The support diagonal rod is located at the top of the connecting rod, and a stabilizing rod is fixedly connected to the top of the support diagonal rod.
[0012] Preferably, both the first support plate and the second support plate are configured as arc-shaped structures. Two supporting diagonal rods on one side of the second support plate are parallel to the first and second inclined connecting beams, respectively. The first support plate is in contact with the piles of the front row of piles, and the second support plate is in contact with the piles of the rear row of piles. The contact area with the piles is increased by the first and second support plates, reducing local stress. The stability of the stabilizing mechanism can be improved by the supporting diagonal rods and the stabilizing rods.
[0013] The technical effects and advantages of this utility model are as follows:
[0014] 1. This utility model firstly enhances the overall strength by setting up front and rear piles, and forms a continuous water-stop curtain by pouring high-pressure jet grouting piles between the front piles. The high-pressure jet grouting piles and the front piles are arranged alternately to achieve the integration of support and water-stopping, reduce seepage channels, and enhance the shear resistance of the front structure by pouring piles on one side of the front piles. This also serves as a supplement to the water-stop curtain, further blocking the seepage path and improving the overall strength.
[0015] 2. This utility model also transforms the force of a single pile into the force of the whole pile through the setting of the cap beam. The first and second inclined connecting beams are cast in a cross shape on the top of the cap beam to form a triangular stable system that works together to resist horizontal loads. All three are cast in one go to ensure the strength of the joint. Through the stabilizing mechanism, local stress can be reduced and the stability of the stabilizing mechanism itself can be improved, so that multiple front and rear piles can be integrated into a whole, restricting the displacement of the front and rear piles and improving the support strength.
[0016] In summary, through the interaction of the above-mentioned multiple effects, the overall strength can be enhanced, the shear resistance of the front structure can be improved, the seepage channels can be reduced, the seepage path can be further blocked, and the horizontal loads can be resisted in a coordinated manner to ensure the strength of the nodes. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0018] Figure 2 This is a schematic diagram of the structure of the cap beam after installation.
[0019] Figure 3 This is a schematic diagram of the structure of the first inclined connecting beam after installation.
[0020] Figure 4 This is a schematic diagram of the structure of the second inclined connecting beam after installation.
[0021] Figure 5 This is a schematic diagram of the connection structure between the stabilizing mechanism of this utility model and the front and rear piles.
[0022] Figure 6 This is a side view schematic diagram of the connection structure between the stabilizing mechanism and the front and rear piles of this utility model.
[0023] Figure 7 This is a schematic diagram of the stabilizing mechanism of this utility model.
[0024] The attached diagram is labeled as follows: 1. Front row of piles; 2. Rear row of piles; 3. High-pressure jet grouting piles; 4. Row of piles; 5. Foundation pit wall soil; 6. Cap beam; 7. First inclined connecting beam; 8. Second inclined connecting beam; 9. First support plate; 10. Second support plate; 11. Connecting rod; 12. Supporting diagonal rod; 13. Stabilizer bar. Detailed Implementation
[0025] 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.
[0026] As attached Figures 1-7 The illustrated water-stop curtain composite support structure includes a front row of piles 1 and a rear row of piles 2 set in the foundation pit. The front row of piles 1 ensures that the pile body effectively transmits lateral earth pressure. High-pressure jet grouting piles 3 are set in the middle gap of the front row of piles 1. Through the high-pressure jet grouting piles 3, a continuous water-stop curtain can be formed. The two are arranged alternately to realize the integration of support and water-stopping, and reduce seepage channels. A row of piles 4 with the same length as the front row of piles is set on the side of the front row of piles 1 close to the rear row of piles 2. This enhances the shear resistance of the front structure and serves as a supplement to the water-stop curtain, further blocking the seepage path. The foundation pit wall soil 5 is filled between the front row of piles 1 and the rear row of piles 2.
[0027] Both the front row of piles 1 and the rear row of piles 2 are equipped with cap beams 6, which are cast on the top of the front and rear rows of piles to transform the force of a single pile into the force of the whole. Multiple first inclined beams 7 and second inclined beams 8 are set on the top of the cap beams 6. Multiple stabilizing mechanisms are set between the front row of piles 1 and the rear row of piles 2. The first inclined beams 7 and the second inclined beams 8 cross and connect the front and rear cap beams to form a triangular stabilizing system, which works together to resist horizontal loads. All three are cast in one go to ensure the strength of the joint. Through the stabilizing mechanisms, the displacement of the front and rear rows of piles can be restricted, thereby improving the support strength.
[0028] As attached Figures 1-4As shown, the pile spacing of the front row of piles 1 is set to 1.5-2 times the pile diameter, and the pile length of the front row of piles 1 is set to 1.5-2 times the depth of the foundation pit. The pile diameters of the front row of piles 1 and the rear row of piles 2 are the same. The pile spacing of the rear row of piles 2 is set to 1.5-2 times the pile diameter, and the pile length of the rear row of piles 2 is set to 2-2.5 times the depth of the foundation pit. The spacing between the front row of piles 1 and the rear row of piles 2 is set to 2-2.5 times the pile diameter. The high-pressure jet grouting piles 3 are tightly interlocked, and the pile diameter of the high-pressure jet grouting piles 3 is set to 0.5-1 times the pile diameter of the front row of piles 1. The jet grouting piles 3 and piles 4 have the same diameter, and the lengths of both high-pressure jet grouting piles 3 and piles 4 are the same as the length of the front piles 1. The front piles 1 ensure that the pile body can effectively transmit lateral earth pressure, while the rear piles 2 provide sufficient tensile bearing capacity and overturning moment. The high-pressure jet grouting piles 3 fill the gaps in the front piles 1 to form a continuous water-stop curtain. The two are arranged alternately to achieve the integration of support and water-stopping, reducing seepage channels. The piles 4 enhance the shear resistance of the front structure and serve as a supplement to the water-stop curtain, further blocking the seepage path.
[0029] As attached Figure 2 , 3 As shown in Figures 4 and 6, the front row of piles 1 and the rear row of piles 2 are connected and fixed by the first inclined beam 7 and the second inclined beam 8. The first inclined beam 7 and the second inclined beam 8 are intersecting. The width of the cap beam 6, the first inclined beam 7, and the second inclined beam 8 is not less than the diameter of the front row of piles 1, and the height of the cap beam 6, the first inclined beam 7, and the second inclined beam 8 is not less than 0.6 times the width of the beam. The cap beam 6, the first inclined beam 7, and the second inclined beam 8 are cast in one go. The cap beam 6 transforms the force of a single pile into the force of the whole. The first inclined beam 7 and the second inclined beam 8 intersect to connect the front and rear cap beams, forming a triangular stable system that works together to resist horizontal loads. All three are cast in one go to ensure the strength of the joint.
[0030] As attached Figures 5-7 As shown, the stabilizing mechanism includes a second support plate 10 and two first support plates 9 disposed on opposite sides of the front row of piles 1 and the rear row of piles 2. A connecting rod 11 and a supporting inclined rod 12 are fixedly connected between the second support plate 10 and the first support plate 9. The supporting inclined rod 12 is located at the top of the connecting rod 11, and a stabilizing rod 13 is fixedly connected to the top of the supporting inclined rod 12. Both the first support plate 9 and the second support plate 10 are configured with an arc-shaped structure. The two supporting inclined rods 12 on one side of the second support plate 10 are parallel to the first inclined connecting beam 7 and the second inclined connecting beam 8, respectively. The first support plate 9 is in contact with the pile column of the front row of piles 1, and the second support plate 10 is in contact with the pile column of the rear row of piles 2. The first support plate 9 and the second support plate 10 increase the contact area with the pile body and reduce local stress. The supporting inclined rod 12 and the stabilizing rod 13 can improve the stability of the stabilizing mechanism.
[0031] The working principle of this utility model is as follows: When in use, a front row of piles 1 and a rear row of piles 2 are poured. Then, high-pressure jet grouting piles 3 are poured between the front row of piles 1. Through the high-pressure jet grouting piles 3, a continuous water-stop curtain can be formed. The two are arranged alternately to realize the integration of support and water-stopping, reducing the seepage channels. Then, a row of piles 4 is poured on the side of the front row of piles 1 close to the rear row of piles 2 to enhance the shear resistance of the front structure and serve as a supplement to the water-stop curtain, further blocking the seepage path.
[0032] A first support plate 9 and a second support plate 10 are placed between the front row of piles 1 and the rear row of piles 2. The local stress is reduced and the stability of the stabilizing mechanism is improved by the cooperation of the connecting rod 11, the support diagonal rod 12 and the stabilizing rod 13. This makes the multiple front row of piles 1 and the rear row of piles 2 form an integral strength, restricts the displacement of the front and rear rows of piles, and improves the support strength.
[0033] Then, a cap beam 6 is poured on top of the front pile 1 and the rear pile 2 to transform the force of a single pile into the force of the whole. The first inclined connecting beam 7 and the second inclined connecting beam 8 are poured at the top of the cap beam 6 to form a triangular stable system that works together to resist horizontal loads. All three are poured at one time to ensure the strength of the joint.
[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A composite support structure for a water-stop curtain, characterized in that: It includes a front row of piles (1) and a rear row of piles (2) set in the foundation pit. A high-pressure jet grouting pile (3) is set in the middle gap of the front row of piles (1). A row of piles (4) is set on the side of the front row of piles (1) close to the rear row of piles (2). The foundation pit wall soil (5) is filled between the front row of piles (1) and the rear row of piles (2). The top of the front row of piles (1) and the rear row of piles (2) are provided with cap beams (6), and the top of the cap beams (6) are provided with multiple first inclined beams (7) and second inclined beams (8). Multiple stabilizing mechanisms are provided between the front row of piles (1) and the rear row of piles (2).
2. The composite support structure for a water-stop curtain according to claim 1, characterized in that: The spacing between the front piles (1) is set to 1.5-2 times the pile diameter, the length of the front piles (1) is set to 1.5-2 times the depth of the foundation pit, and the pile diameters of the front piles (1) and the rear piles (2) are the same.
3. The composite support structure for a water-stop curtain according to claim 1, characterized in that: The spacing between the rear piles (2) is set to 1.5-2 times the pile diameter, the length of the rear piles (2) is set to 2-2.5 times the depth of the foundation pit, and the spacing between the front piles (1) and the rear piles (2) is set to 2-2.5 times the pile diameter.
4. The composite support structure for a water-stop curtain according to claim 1, characterized in that: The high-pressure jet grouting piles (3) are tightly interlocked with each other. The diameter of the high-pressure jet grouting piles (3) is set to 0.5-1 times the diameter of the front row of piles (1). The high-pressure jet grouting piles (3) and the row of piles (4) have the same diameter. The length of the high-pressure jet grouting piles (3) and the row of piles (4) is the same as the length of the front row of piles (1).
5. The composite support structure for a water-stop curtain according to claim 1, characterized in that: The front row of piles (1) and the rear row of piles (2) are connected and fixed by the first inclined beam (7) and the second inclined beam (8). The first inclined beam (7) and the second inclined beam (8) are arranged in an intersecting manner. The width of the cap beam (6), the first inclined beam (7) and the second inclined beam (8) is not less than the diameter of the front row of piles (1). The height of the cap beam (6), the first inclined beam (7) and the second inclined beam (8) is not less than 0.6 times the width of the beam. The cap beam (6), the first inclined beam (7) and the second inclined beam (8) are cast in one go.
6. The composite support structure for a water-stop curtain according to claim 1, characterized in that: The stabilizing mechanism includes a second support plate (10) and two first support plates (9) disposed on opposite sides of the front row of piles (1) and the rear row of piles (2). A connecting rod (11) and a support diagonal rod (12) are fixedly connected between the second support plate (10) and the first support plate (9). The support diagonal rod (12) is located at the top of the connecting rod (11), and a stabilizing rod (13) is fixedly connected to the top of the support diagonal rod (12).
7. The composite support structure for a water-stop curtain according to claim 6, characterized in that: The first support plate (9) and the second support plate (10) are both set as arc-shaped structures. The two support diagonal rods (12) on one side of the second support plate (10) are parallel to the first diagonal connecting beam (7) and the second diagonal connecting beam (8) respectively. The first support plate (9) is attached to the pile column of the front row of piles (1), and the second support plate (10) is attached to the pile column of the rear row of piles (2).