A foundation pit inclined strut structure and a foundation pit inclined strut supporting method

Abstract

The application relates to the technical field of civil engineering, and discloses a foundation pit inclined strut structure and a foundation pit inclined strut supporting method. The foundation pit inclined strut structure comprises a supporting body, a corbel and an inclined strut mechanism. The inclined strut mechanism comprises a top supporting mechanism, a middle supporting mechanism and a bottom supporting mechanism. The bottom supporting mechanism comprises a pile body and a force receiving body. The force receiving body is arranged in the pile body. The force receiving body comprises a telescopic assembly and a plurality of plug rod assemblies. The plug rod assemblies are connected with the telescopic assembly. A grouting hole is arranged in the plug rod assembly. The plug rod assembly is connected with a grouting pipeline. The cross section of the plug rod assembly is conical. The supporting pile at the bottom of the inclined strut does not need to be poured, so that the slurry is saved. In the application, the pile body is punched into the soil layer to be poured in sections. Only a small pouring amount is needed, the shearing resistance and the collapse resistance of the pile body are improved, and when the inclined strut collapses, the pile body can be conveniently punched into a deeper soil layer to realize support and reinforcement.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a foundation pit inclined bracing structure and a foundation pit inclined bracing support method. Background Technology

[0002] Currently, in underground engineering construction, due to the reduction in available building area, the demand for underground space construction is gradually increasing, resulting in larger and larger excavation areas for foundation pits. While the previously used concrete internal bracing offers high rigidity and reduces foundation pit deformation, it requires a large amount of material, and the resources cannot be reused after dismantling, leading to a long construction period. When using inclined bracing structures, in relatively soft soil conditions, it is generally necessary to pour support piles at the bottom of the inclined bracing to achieve shear and overturning resistance. This method still requires a large amount of concrete and has a long construction period. Simply adding a base to the bottom of the inclined bracing to increase the contact area with the ground is only suitable for small foundation pits and is ineffective for large foundation pits. To address these issues, this application proposes an inclined bracing structure with superior support performance, while reducing the amount of concrete poured and increasing construction efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a foundation pit inclined bracing structure and foundation pit inclined bracing support method to overcome the problem that large-scale inclined bracing support requires a large amount of pouring and has low construction efficiency at the current stage.

[0004] The present invention is achieved through the following technical solution.

[0005] This invention discloses a foundation pit inclined bracing structure, comprising a support body, a capping beam, and an inclined bracing mechanism. The inclined bracing mechanism includes a top support mechanism, a middle support mechanism, and a bottom support mechanism. The top support mechanism is connected to the capping beam, and the middle support mechanism connects the top support mechanism and the bottom support mechanism. The bottom support mechanism includes a pile and a load-bearing body. The load-bearing body is disposed within the pile and includes a telescopic component and several insertion rod assemblies. The insertion rod assemblies are connected to the telescopic component and have grouting holes. The insertion rod assemblies are connected to grouting pipes. The insertion rod assemblies have a tapered cross-section. The pile is driven into the soil layer, and the telescopic component drives the insertion rod assemblies to extend from the pile. After extending a certain length, the insertion rod assemblies retract a certain distance, and grout is injected into the insertion rod assemblies through the grouting pipes.

[0006] Furthermore, an outer sleeve is installed on the insertion rod assembly, the outer sleeve being fitted onto the outside of the insertion rod assembly and being detachable from the insertion rod assembly.

[0007] Furthermore, the outer sleeve surface is provided with an anti-slip structure.

[0008] Furthermore, the top support mechanism includes a top baffle and a top support rod, the top support rod being hinged to the top baffle, and the middle support mechanism includes a plurality of connecting rods.

[0009] Furthermore, the support body is provided with a guide rail, the top baffle is provided with a movable part, the movable part is mounted on the guide rail, and the top baffle is provided with a lifting ring.

[0010] Furthermore, the central support mechanism also includes a jack and a support rod, the jack being inserted into a slot on the support rod, and a gasket being provided between the jack and the support rod.

[0011] Furthermore, the load-bearing body is provided along both the length and circumferential directions of the pile.

[0012] Furthermore, the foundation pit bracing structure also includes a displacement detection mechanism, which is used to detect the displacement of the pile.

[0013] A method for diagonal bracing of foundation pits, based on the aforementioned diagonal bracing structure, includes the following steps:

[0014] Measurement and positioning are performed to determine the location of the pile foundation, and the pile is driven into the soil layer at the pile foundation location;

[0015] The telescopic component is used to extend the insertion rod assembly from the pile body and insert it into the soil layer around the pile body. After the insertion rod assembly extends to a set length, it retracts to a set length, so that a grouting space is formed around the insertion rod assembly.

[0016] Grout is introduced through grouting pipes and injected into the grouting space through insert assembly;

[0017] After grouting is completed, a middle support mechanism and a top support mechanism are installed on the pile body, and the top support mechanism is connected to the cap beam.

[0018] Furthermore, the specific steps for installing the top support mechanism are as follows: connect the top baffle and the top support rod, install the top baffle in the guide rail, connect the sling to the lifting ring, pull the sling to raise the top baffle to the fixed position and fix it.

[0019] The beneficial effects of this invention are as follows: By setting up a bottom support mechanism, it is unnecessary to pour support piles at the bottom of the inclined brace during inclined bracing operations, thus saving grout. This application uses a method of driving piles into the soil layer for sectional pouring, requiring only a smaller pouring volume, which improves the shear resistance and collapse resistance of the piles. After subsequent removal, the volume of pouring waste left in the soil layer is small, making it easy to clean. Furthermore, in the event of inclined bracing collapse, the piles can be easily driven into deeper soil layers for support and reinforcement. After the support is completed, the piles can be removed and reused multiple times. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of the foundation pit bracing structure;

[0023] Figure 2 This is a schematic diagram of the overall structure of the foundation pit bracing structure in Examples 3 to 5;

[0024] Figure 3 This is a schematic diagram of the top support mechanism.

[0025] Figure 4 A schematic diagram of the jack and support rod structure;

[0026] Figure 5 This is a sectional view of the bottom support mechanism;

[0027] Figure 6 This is a schematic diagram of the structure of the bottom support mechanism after the insert rod assembly has extended.

[0028] Figure 7 This is a cross-sectional view of the insert assembly. Detailed Implementation

[0029] The following is combined Figure 1-7 The present invention will be described in detail below.

[0030] Example 1:

[0031] The present invention provides a foundation pit bracing structure, such as... Figure 1 It includes a support body 10, a cap beam 11, and a diagonal bracing mechanism 20. The support body 10 can be a pile or a slab. The cap beam 11 is set on the top of the support body 10. The diagonal bracing mechanism 20 includes a top support mechanism 21, a middle support mechanism 22, and a bottom support mechanism 23. The top support mechanism 21 is connected to the cap beam 11, and the middle support mechanism 22 connects the top support mechanism 21 and the bottom support mechanism 23.

[0032] like Figure 3The top support mechanism 21 includes a top baffle 211 and a top support rod 215. The top baffle 211 is mounted on the crown beam 11 via a bolt assembly 213. The top baffle 211 is right-angled. A hinged single ear 216 is mounted on the top baffle 211. One end of the top support rod 215 is hinged to the hinged single ear 216 via a connecting pin. The middle support mechanism 22 includes several connecting rods 222, such as... Figure 1 The connecting rod 222 is round and has flanges at both ends. The top support rod 215 also has a flange at one end. The flanges between adjacent connecting rods 222 and between connecting rod 222 and top support rod 215 abut against each other and are then connected and fixed by bolt assembly.

[0033] The length of the central support mechanism 22 is determined based on the depth of the foundation pit and the height of the diagonal bracing, and an appropriate number of connecting rods 222 are used.

[0034] like Figure 5 , 6 The bottom support mechanism 23 includes a pile body 233 and a load-bearing body. The pile body 233 is a cylindrical pile body with a pointed tip 234 at the bottom. The pile body 233 has a cavity inside, and several through holes are provided on the inner wall of the cavity. The load-bearing body is disposed in the pile body 233 and includes a telescopic component 236 and several insert rod components 238. The insert rod components 238 are connected to the telescopic component 236. In this embodiment, the telescopic component 236 is a hydraulic cylinder, and the piston rod in the hydraulic cylinder is connected to the insert rod components 238. Each insert rod component 238 corresponds to a through hole. Figure 7 The cross-section of the insertion rod assembly 238 is conical or isosceles trapezoidal, and its shape is truncated trapezoidal. The thickness is thinner at the end facing the through hole. A grouting hole is provided in the insertion rod assembly 238, and the opening of the grouting hole is located at the end facing the through hole. An interface for connecting to the grouting pipe is provided on the insertion rod assembly 238. The grouting pipe 231 is connected to all insertion rod assemblies 238. An opening is provided at the top of the pile body 233, and a cover 232 is installed at the opening. A flange is provided at the outer end of the cover 232 for connecting to the middle support mechanism 22. A grouting interface and an oil interface 239 are provided on the cover 232. The grouting interface is connected to the grouting pipe 231, and the oil interface 239 is connected to the hydraulic cylinder through an oil pipe.

[0035] The installation steps of the bottom support mechanism 23 are as follows: the pile body 233 is driven into the soil layer using a pile driver. After reaching the set depth, the oil supply component oil interface 239 is connected to the grouting interface of the grouting system. The telescopic component 236 drives the insertion rod component 238 to extend out of the pile body 233. After the insertion rod component 238 extends a certain length, it retracts a certain distance. Under the action of the insertion rod component 238, a grouting space is formed in the soil layer. Since the insertion rod component 238 is trapezoidal, the grouting space surrounds the insertion rod component 238. The grouting pipe 231 grouts the insertion rod component 238. Cement grout or fast-drying cement grout is injected into the grouting space. After the grout solidifies, the bottom support mechanism 23 has strong anti-shear and anti-collapse capabilities even in soft soil layers.

[0036] Example 2: Based on Example 1, an outer sleeve 237 is installed on the insertion rod assembly 238. The outer sleeve 237 can be made of cold-pressed steel sheet. The outer sleeve 237 is fitted onto the outside of the insertion rod assembly 238 and can be detached from the insertion rod assembly 238, such as... Figure 7 The outer sleeve 237 has the same shape as the insertion rod assembly 238, and its tail is fastened in the fastening groove of the insertion rod assembly 238. The surface of the outer sleeve 237 is provided with an anti-slip structure 2371. The anti-slip structure 2371 adopts anti-slip texture or has several grooves processed on the surface of the outer sleeve 237 to increase the contact area and friction with the solidified slurry.

[0037] When dismantling the diagonal bracing mechanism after the construction structure is completed, simply use the telescopic component 236 to drive the insertion rod component 238 back into the pile body 233. Under the frictional force between the outer sleeve 237 and the solidified grout, the snap-fit ​​position between the outer sleeve and the insertion rod component 238 deforms, thereby disengaging from the insertion rod component 238. Then, the pile body 233 can be pulled out. For the next use, only a new outer sleeve 237 needs to be installed.

[0038] Additionally, during the support process, if the bottom support mechanism 23 sinks excessively, the telescopic component 236 can drive the insertion rod component 238 back into the pile body 233, and the pile driver can then continue to press the pile body 233 deeper. After pressing, the grouting process can be repeated, thus achieving support adjustment without excavation and improving adjustment efficiency. The grouting interface and oil interface 239 are both located on the top of the cover. After the connecting rod 222 is connected, pipes can be inserted through the connecting rod 222 to connect to the grouting interface and oil interface 239.

[0039] Preferably, the load-bearing body is provided along both the length and circumferential directions of the pile body 233, such as... Figure 5 , 6 The load-bearing bodies are arranged alternately in front, behind, above, and below.

[0040] Example 3: Based on Example 1 or 2, such as Figure 2The support body 10 is equipped with guide rails 30, which are fixed to the support body 10 by bolts or other means. Figure 3 A movable part 214 is provided on the top baffle 211, and the movable part 214 is mounted on the guide rail 30. A lifting ring 212 is provided on the top baffle 211 to connect the top baffle 211 and the top support rod 215. The top baffle 211 is installed in the guide rail 30. By connecting the sling to the lifting ring 212, the top baffle 211 is driven to rise to a fixed position and fixed thereupon by winding the sling with a winch or motor. This eliminates the need for a crane. When large equipment such as cranes cannot be used on site, the top support rod 215 and the middle connecting rod can be easily lifted to a set height.

[0041] Preferably, a roller is provided at the moving part 214, and the roller rolls along the guide rail 30.

[0042] Example 4: Based on Examples 1 to 3, such as Figure 2 The central support mechanism 22 also includes a jack 221 and a support rod 223. The jack 221 is inserted into a slot on the support rod 223. A gasket 224 is provided between the jack 221 and the support rod 223. A flange is provided at the tail of the jack 221 to connect with the adjacent connecting rod 222. The protruding end of the jack 221 is inserted into a slot on the support rod 223. The jack has an oil inlet and an oil outlet on its side, which can be used with a hydraulic electric pump to adjust the axial force of the jack, thereby effectively controlling the deformation of the foundation pit. A semi-circular ring gasket 224 is inserted into the gap created by the jack to increase the overall stability of the structure.

[0043] Example 5: Based on Examples 1 to 4, as follows... Figure 2 It also includes a displacement detection mechanism 40, which is used to detect the displacement of the pile body 233. The displacement detection mechanism 40 is equipped with a distance sensor, such as a laser sensor or an ultrasonic sensor. The distance sensor is connected to the control center server through a cable or wireless communication component. When the detected displacement exceeds the preset range, the server issues an alarm message to remind the staff.

[0044] A method for supporting a foundation pit with inclined bracing, based on the aforementioned foundation pit inclined bracing structure, includes the following steps:

[0045] Measurement and positioning were performed to determine the location of the pile foundation, and pile 233 was driven into the soil layer at the location of the pile foundation.

[0046] The telescopic component 236 is used to extend the insertion rod component 238 out of the pile body 233 and insert it into the soil layer around the pile body 233. After the insertion rod component 238 extends to a set length, it retracts to a set length, so that a grouting space is formed around the insertion rod component 238.

[0047] Grout is introduced through grouting pipe 231 and injected into the grouting space through insert assembly 238;

[0048] After grouting is completed, a middle support mechanism 22 and a top support mechanism 21 are installed on the pile body 233. The top support mechanism 21 is connected to the cap beam 11.

[0049] Optionally, after grouting is completed, the grout can be pushed out or sucked out by connecting an air supply component to the grouting pipe.

[0050] The specific steps for installing the top support mechanism 21 are as follows: connect the top baffle 211 and the top support rod 215, install the top baffle 211 in the guide rail 30, connect the sling to the lifting ring 212, pull the sling to raise the top baffle 211 to the fixed position and fix it.

[0051] During the support process, if the bottom support mechanism 23 sinks too much, the telescopic component 236 can be used to drive the insertion rod component 238 back into the pile body 233, and the pile driver can be used to continue to press the pile body 233 deeper. After pressing, the grouting steps are repeated, so that the support adjustment can be achieved without excavation, thus improving the adjustment efficiency.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A foundation pit diagonal bracing structure, characterized in that: The system includes a support structure (10), a capping beam (11), and a bracing mechanism (20). The bracing mechanism (20) includes a top support mechanism (21), a middle support mechanism (22), and a bottom support mechanism (23). The top support mechanism (21) is connected to the capping beam (11), and the middle support mechanism (22) connects the top support mechanism (21) and the bottom support mechanism (23). The bottom support mechanism (23) includes a pile (233) and a load-bearing body. The load-bearing body is located in the pile (233). The load-bearing body includes a telescopic component (236) and several insert rod assemblies (238). The insert rod assemblies (238) are connected to the telescopic component (236). The insert rod assemblies (238) are provided with grouting holes and are connected to grouting pipes (231). The component (238) has a tapered cross section. The pile (233) is driven into the soil. The telescopic component (236) drives the insertion rod component (238) to extend out of the pile (233). After the insertion rod component (238) extends a certain length, it retracts a certain distance and grouts to the insertion rod component (238) through the grouting pipe (231). An outer sleeve (237) is installed on the insertion rod component (238). The outer sleeve (237) is fitted on the outside of the insertion rod component (238) and can be detached from the insertion rod component (238). The top support mechanism (21) includes a top baffle (211) and a top support rod (215). The top support rod (215) is hinged to the top baffle (211). The middle support mechanism (22) includes several connecting rods (222).

2. The foundation pit bracing structure according to claim 1, characterized in that: The outer sleeve (237) has an anti-slip structure (2371) on its surface.

3. The foundation pit bracing structure according to claim 1, characterized in that: The support body (10) is provided with a guide rail (30), the top baffle (211) is provided with a movable part (214), the movable part (214) is installed on the guide rail (30), and the top baffle (211) is provided with a lifting ring (212).

4. A foundation pit bracing structure according to any one of claims 1 to 3, characterized in that: The central support mechanism (22) also includes a jack (221) and a support rod (223). The jack (221) is inserted into a slot on the support rod (223), and a gasket (224) is provided between the jack (221) and the support rod (223).

5. A foundation pit bracing structure according to any one of claims 1 to 3, characterized in that: The load-bearing body is provided along both the length and circumferential directions of the pile (233).

6. A foundation pit bracing structure according to any one of claims 1 to 3, characterized in that: The foundation pit bracing structure also includes a displacement detection mechanism (40), which is used to detect the displacement of the pile (233).

7. A method for supporting a foundation pit with inclined bracing, based on the foundation pit inclined bracing structure according to any one of claims 1-6, characterized in that: Includes the following steps: Measure and locate the pile foundation, determine the pile foundation position, and drive the pile (233) into the soil layer at the pile foundation position; Using the telescopic component (236), the insertion rod component (238) extends out of the pile body (233) and is inserted into the soil layer around the pile body (233). After the insertion rod component (238) extends to a set length, it retracts to a set length, so that a grouting space is formed around the insertion rod component (238). Grout is introduced through grouting pipe (231) and injected into grouting space through insert assembly (238); After grouting is completed, a middle support mechanism (22) and a top support mechanism (21) are installed on the pile body (233), and the top support mechanism (21) is connected to the cap beam (11).

8. The method for supporting inclined supports in a foundation pit according to claim 7, characterized in that: The specific steps for installing the top support mechanism (21) are as follows: connect the top baffle (211) and the top support rod (215), install the top baffle (211) in the guide rail (30), connect the sling to the lifting ring (212), pull the sling to raise the top baffle (211) to the fixed position and fix it.

Images