Foundation pit inclined enclosure system and construction method thereof

Abstract

The invention discloses a foundation pit inclined enclosure system and a construction method thereof, and belongs to the technical field of building construction.The foundation pit inclined enclosure system comprises enclosure piles and inclined struts acting on the enclosure piles, supporting bodies are fixedly arranged at the top ends of the enclosure piles, a bottom plate is fixedly installed at the top ends of the inclined struts, rotating parts are rotatably installed between the supporting bodies and the bottom plate, and gears are arranged at the two ends of each rotating part; supporting plates are fixedly arranged on the portions, on the two sides of the rotating part, of the side wall of the fender post, side plates are fixedly arranged on the supporting plates, the gears are rotationally connected with the side plates, driving mechanisms acting on pressing rods on the side wall of the fender post are fixedly installed on the supporting plates, and racks meshed with the gears are fixedly connected to the pressing rods. According to the system, the two functions of transverse supporting of the fender posts and inclined supporting adjustment are coupled into one action, the fender posts are reinforced from the side face, the jacking force of the inclined struts is synchronously increased, the two-way cooperative reinforcing effect is formed, and the overall rigidity and stability of an enclosure system are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to an inclined retaining system for foundation pits and its construction method. Background Technology

[0002] With the rapid development and increase in high-rise buildings, foundation pits will become larger and deeper, making the construction of support structures for these pits increasingly difficult. During construction, in order to ensure the safety and ease of construction of underground structures and the surrounding environment of deep foundation pits, it is necessary to take support and reinforcement measures for the sidewalls and surrounding environment of deep foundation pits.

[0003] Currently, some foundation pits utilize inclined supports. For example, Chinese patent CN111364480A discloses a prestressed inclined pile support and its construction method. This method adds a prestressing application device to the existing inclined pile support, which can provide a counter-thrust force to the inclined pile support through a force transmission device, causing the inclined pile to deform in advance and thus quickly exert its bearing capacity. However, applying prestress only to the inclined support is equivalent to "pushing" the retaining pile from the side. This force needs to overcome the initial bending and loose joints of the retaining pile itself, resulting in low efficiency. Furthermore, the concentrated application of prestress to the inclined support can easily lead to damage to the inclined support under stress, reducing its load-bearing reliability.

[0004] Therefore, it is necessary to propose an inclined retaining system for foundation pits and its construction method to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an inclined retaining system for foundation pits and its construction method, which fundamentally improves the overall stiffness, initial state and deformation control capability of the support system by directly strengthening the retaining pile body and optimizing the synergistic force distribution with the inclined bracing.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses an inclined retaining system for foundation pits, comprising retaining piles and inclined braces acting on the retaining piles. A support body is fixedly installed at the top of the retaining piles, and a base plate is fixedly installed at the top of the inclined braces. A rotating component is rotatably installed between the support body and the base plate. Rotating the rotating component can adjust the distance between the support body and the base plate. Gears are provided at both ends of the rotating component, and rotating the gears can cause the rotating component to rotate. Support plates are fixedly installed on both sides of the rotating component on the sidewall of the retaining pile. Side plates are fixedly installed on the support plates, and the gears are rotatably connected to the side plates. A drive mechanism for outputting linear motion is fixedly installed on the support plates. A pressure rod acting on the sidewall of the retaining pile is fixedly connected to the output end of the drive mechanism. A rack that meshes with the gear is fixedly connected to the pressure rod. The drive mechanism drives the pressure rod to move, which in turn drives the gear to rotate through the rack, thereby rotating the rotating component to adjust the distance between the base plate and the support body.

[0007] Furthermore, a pre-embedded rod is embedded in the support body, the axial direction of the pre-embedded rod is parallel to the axial direction of the diagonal brace, a top plate is slidably installed on the pre-embedded rod, a first spring is fixedly connected between the top plate and the support body, and the rotating component is rotatably installed between the top plate and the bottom plate.

[0008] Furthermore, a connecting plate is slidably installed on the pre-embedded rod, and the first spring is fixedly connected between the connecting plate and the top plate. The side wall of the connecting plate near the support body is in contact with the support body, and the side wall of the connecting plate away from the support body is perpendicular to the diagonal brace.

[0009] Furthermore, a barrier is fixedly connected to the base plate, and the barrier and the base plate are connected to form a box. The rotating component is rotatably disposed inside the box. A notch is provided on the side of the box away from the base plate. The top plate is slidably connected to the notch. The top plate and the notch cooperate to close the box. Both ends of the rotating component are fixedly connected to a connecting shaft. The connecting shaft passes through the box and is connected to a gear key.

[0010] Furthermore, a second spring is fixedly connected between the top plate and the top wall of the box.

[0011] Furthermore, the rotating component is a cam.

[0012] Furthermore, the rotating component is a frustum, and the bottom plate and top plate are provided with curved surfaces that mate with the frustum so that both the bottom plate and the top plate are in surface contact with the frustum. A threaded shaft is fixedly sleeved on the connecting shaft, and the threaded shaft is threadedly connected to the enclosure. Rotating the threaded shaft can cause the frustum to move axially along the threaded shaft to adjust the distance between the bottom plate and the top plate. A keyway is provided inside the gear, and a gap is provided between the connecting shaft and the side wall of the keyway so that the connecting shaft can move axially along the gear.

[0013] A construction method for an inclined retaining system for foundation pits includes the following steps: S1. First, construct retaining piles in the soil, and then use pile foundation equipment to form inclined holes for the inclined bracing. Insert the inclined bracing into the inclined holes to the corresponding design elevation. S2. Fix the diagonal brace to the bottom plate of the box body, wherein the rotating parts inside the box body are in a state that can rotate and increase or decrease the distance between the top plate and the bottom plate; then adjust the bolts on the embedded rod to make the first spring and the second spring reach the preset value of the compression state, and then pour the support body to fix the embedded rod in the support body. S3. Slide the gear onto the connecting shaft, then install the support plate and side plate, and rotatably connect the gear and the side plate. Then slide the pressure rod onto the support plate and mesh the rack with the gear. Finally, fix the drive mechanism onto the support plate so that the output end of the drive mechanism is fixed to the pressure rod. S4. Then continue to excavate the soil. During the excavation process, the drive mechanism drives the rotating parts to rotate in order to adjust the support force on the retaining piles and diagonal braces. S5. After the foundation pit is excavated to the preset position, pour the concrete base slab.

[0014] The beneficial effects of this invention are as follows: 1. This system couples the functions of "lateral support of retaining piles" and "adjustment of diagonal support" into a single action. When the jack extends, it not only reinforces the retaining piles from the side but also simultaneously increases the jacking force of the diagonal brace, forming a two-way synergistic reinforcement effect, which significantly improves the overall rigidity and stability of the retaining system. Furthermore, through the cooperation of gears and racks, the direction of the pressure bar acting on the retaining pile can be adjusted arbitrarily, improving the system's flexibility.

[0015] 2. The present invention can actively "hold back" the retaining piles through the driving mechanism, offset part of the soil pressure, significantly reduce the lateral displacement during the foundation pit excavation process, and eliminate the initial gaps and inelastic deformation between the supporting components and connecting nodes, ensuring that each component can be stressed in a coordinated manner. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a cross-sectional view of the overall structure of an embodiment of the present invention. Figure 2 Embodiments of the present invention Figure 1 A magnified view of part A in the middle; Figure 3 This is a partial structural cross-sectional view of an embodiment of the present invention where the rotating component is a cam; Figure 4 This is a partial structural cross-sectional view of the rotating component in an embodiment of the present invention when it is a frustum.

[0017] The following are the markings in the attached diagram: retaining pile 1, support body 101, embedded rod 102, top plate 103, first spring 104, connecting plate 105, second spring 106, diagonal brace 2, bottom plate 201, cam 202, gear 203, enclosure 204, notch 205, connecting shaft 206, frustum 207, threaded shaft 208, keyway 209, support plate 3, drive mechanism 301, pressure rod 302, rack 303, side plate 304, inclined hole 4. Detailed Implementation

[0018] like Figures 1-4As shown, this invention discloses an inclined retaining system for foundation pits, comprising: retaining piles 1 and inclined braces 2 acting on the retaining piles 1. A support body 101 is fixedly installed at the top of the retaining piles 1, and a base plate 201 is fixedly installed at the top of the inclined braces 2. A rotating component is rotatably installed between the support body 101 and the base plate 201. Gears 203 are provided at both ends of the rotating component. Support plates 3 are fixedly installed on both sides of the sidewall of the retaining piles 1 on the rotating component. Side plates 304 are fixedly installed on the support plates 3. The gears 203 are rotatably connected to the side plates 304. A drive mechanism 301 for outputting linear motion is fixedly installed on the support plates 3. The drive mechanism 301 is a jack. A pressure rod 302 acting on the sidewall of the retaining piles 1 is fixedly connected to the output end of the drive mechanism 301. A rack 303 meshing with the gears 203 is fixedly connected to the pressure rod 302.

[0019] In this design, the rotating component is a cam 202, and the system couples the two functions of "lateral support of retaining piles" and "adjustment of diagonal support" into one action. When the jack extends, it not only reinforces the retaining pile 1 from the side but also simultaneously increases the jacking force of the diagonal brace 2, forming a two-way synergistic reinforcement effect, which significantly improves the overall rigidity and stability of the retaining system. Furthermore, through the cooperation of gear 203 and rack 303, the direction of the pressure rod 302 acting on the retaining pile 1 can be adjusted arbitrarily, improving the system's flexibility.

[0020] In one embodiment of the present invention, a pre-embedded rod 102 is pre-embedded in the support body 101, the axial direction of the pre-embedded rod 102 is parallel to the axial direction of the diagonal brace 2, a top plate 103 is slidably installed on the pre-embedded rod 102, a first spring 104 is fixedly connected between the top plate 103 and the support body 101, and the rotating component is rotatably installed between the top plate 103 and the bottom plate 201.

[0021] In this design, the first spring 104 ensures that the top plate 103 and the bottom plate 201 can always clamp the rotating component. This ensures that when the prestress needs to be reduced, the diagonal brace 2 can still support the support body 101. When the prestress needs to be increased, the deformation of the first spring 104 can offset part of the prestress, thereby reducing the prestress that the rotating component directly exerts on the diagonal brace 2. This reduces the wear and tear on the diagonal brace 2 and improves its service life.

[0022] In one embodiment of the present invention, a connecting plate 105 is slidably installed on the pre-embedded rod 102, and the first spring 104 is fixedly connected between the connecting plate 105 and the top plate 103. The side wall of the connecting plate 105 near the support body 101 is in contact with the support body 101, and the side wall of the connecting plate 105 away from the support body 101 is perpendicular to the diagonal brace 2.

[0023] In this scheme, when installing the top plate 103, the connecting plate 105, the first spring 104 and the top plate 103 are slid in as a whole along the embedded rod 102 to facilitate installation. The connecting plate 105 fits into the support body 101, which makes it easy to prepare the connecting plate 105 according to the slope of the support body 101. This avoids the prestress adjustment being affected by the slope deviation of the cast support body 101 and the non-perpendicularity of the inclined brace 2.

[0024] In one embodiment of the present invention, a baffle 204 is fixedly connected to the base plate 201, and the baffle 204 and the base plate 201 are connected to form a box. The rotating component is rotatably disposed in the box. A notch 205 is provided on the side of the box away from the base plate 201. The top plate 103 is slidably connected to the notch 205. The cooperation between the top plate 103 and the notch 205 can seal the box to prevent external impurities from entering the box and affecting the rotation accuracy of the rotating component. Both ends of the rotating component are fixedly connected to a connecting shaft 206, and the connecting shaft 206 is keyed to the gear 203.

[0025] In one embodiment of the present invention, a second spring 106 is fixedly connected between the top plate 103 and the top wall of the box.

[0026] In this scheme, the second spring 106 connects the top plate 103 and the box body as a whole, and provides space for the top plate 103 to move closer to the box body, so that the prestress can be reduced when the prestress is too large.

[0027] In one embodiment of the present invention, the rotating component is a frustum 207. The base plate 201 and the top plate 103 are provided with curved surfaces that mate with the frustum 207, so that the base plate 201 and the top plate 103 are in surface contact with the frustum 207. A threaded shaft 208 is fixedly sleeved on the connecting shaft 206. The threaded shaft 208 is threadedly connected to the housing. Rotating the threaded shaft can cause the frustum 207 to move axially along the threaded shaft to adjust the distance between the base plate 201 and the top plate 103. A keyway 209 is provided in the gear 203. A gap is provided between the connecting shaft 206 and the side wall of the keyway 209 so that the connecting shaft 206 can move axially along the gear 203.

[0028] In this design, the rotating component is configured as a frustum 207, so that both the base plate 201 and the top plate 103 are in surface contact with the frustum 207. This improves the load-bearing capacity of the rotating component on the base plate 201 and the top plate 103. When the gear 203 rotates, it can drive the connecting shaft 206, the threaded shaft 208, and the frustum 207 to rotate synchronously. The threaded shaft 208 is threadedly connected to the housing, which allows the threaded shaft 208 to rotate while moving axially along the gear 203, thereby causing the frustum 207 to move axially to adjust the distance between the base plate 201 and the top plate 103. The threaded engagement between the threaded shaft 208 and the housing ensures the stability of the frustum 207 after it moves to the preset position.

[0029] A construction method for an inclined retaining system for foundation pits includes the following steps: S1. First, construct retaining piles 1 in the soil, and then use pile foundation equipment to form inclined holes for bracing 2. Insert bracing 2 into the inclined holes to the corresponding design elevation. S2. Fix the diagonal brace 2 to the bottom plate 201 of the box body, wherein the rotating parts inside the box body are in a state that can rotate and increase or decrease the distance between the top plate 103 and the bottom plate 201; then adjust the bolts on the embedded rod 102 to make the first spring 104 and the second spring 106 reach the preset value of the compression state, and then pour the support body 101 so that the embedded rod 102 is fixed in the support body 101; S3. Slide the gear 203 onto the connecting shaft 206, then install the support plate 3 and the side plate 204, and rotatably connect the gear 203 and the side plate 204. Then slide the pressure rod 302 onto the support plate 3 and mesh the rack 303 with the gear 203. Then fix the drive mechanism 301 onto the support plate 3 so that the output end of the drive mechanism 301 is fixed to the pressure rod 302. S4. Then continue to excavate the soil. During the excavation process, the rotating parts are driven by the drive mechanism 301 to adjust the supporting force on the retaining pile 1 and the inclined brace 2. S5. After the foundation pit is excavated to the preset position, pour the concrete base slab.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A sloping retaining system for a foundation pit, comprising retaining piles and inclined bracing acting on the retaining piles, characterized in that, A support body is fixedly installed at the top of the retaining pile, and a base plate is fixedly installed at the top of the diagonal brace. A rotating component is rotatably installed between the support body and the base plate. Rotating the rotating component can adjust the distance between the support body and the base plate. Gears are provided at both ends of the rotating component. Rotating the gears can cause the rotating component to rotate. Support plates are fixedly installed on both sides of the rotating component on the side wall of the retaining pile. Side plates are fixedly installed on the support plates. The gears are rotatably connected to the side plates. A drive mechanism for outputting linear motion is fixedly installed on the support plates. A pressure rod acting on the side wall of the retaining pile is fixedly connected to the pressure rod. A rack meshing with the gear is fixedly connected to the pressure rod. The drive mechanism drives the pressure rod to move, which can drive the gear to rotate through the rack, thereby rotating the rotating component to adjust the distance between the base plate and the support body.

2. The inclined retaining system for foundation pits according to claim 1, characterized in that: An embedded rod is pre-embedded in the support body. The axis of the embedded rod is parallel to the axis of the diagonal brace. A top plate is slidably installed on the embedded rod. A first spring is fixedly connected between the top plate and the support body. The rotating component is rotatably installed between the top plate and the bottom plate.

3. The inclined retaining system for foundation pits according to claim 2, characterized in that: A connecting plate is slidably installed on the embedded rod. The first spring is fixedly connected between the connecting plate and the top plate. The side wall of the connecting plate near the support body is in contact with the support body, and the side wall of the connecting plate away from the support body is perpendicular to the diagonal brace.

4. The inclined retaining system for foundation pits according to claim 3, characterized in that: A barrier is fixedly connected to the base plate, and the barrier and the base plate are connected to form a box. The rotating component is rotatably installed inside the box. A notch is provided on the side of the box away from the base plate. The top plate is slidably connected to the notch. The top plate and the notch cooperate to close the box. Connecting shafts are fixedly connected to both ends of the rotating component. The connecting shafts pass through the box and are connected to a gear key.

5. The inclined retaining system for foundation pits according to claim 4, characterized in that: A second spring is fixedly connected between the top plate and the top wall of the box.

6. The inclined retaining system for foundation pits according to claim 5, characterized in that: The rotating component is a cam.

7. The inclined retaining system for foundation pits according to claim 5, characterized in that: The rotating component is a frustum of a cone. The bottom plate and top plate are provided with curved surfaces that mate with the frustum of a cone, so that the bottom plate and top plate are in surface contact with the frustum of a cone. A threaded shaft is fixedly sleeved on the connecting shaft. The threaded shaft is threadedly connected to the enclosure. Rotating the threaded shaft can move the frustum of a cone along the axial direction of the threaded shaft to adjust the distance between the bottom plate and the top plate. A keyway is provided inside the gear. A gap is provided between the connecting shaft and the side wall of the keyway so that the connecting shaft can move along the axial direction of the gear.

8. The construction method of the inclined retaining system for foundation pits according to any one of claims 1-7, characterized in that, Includes the following steps: S1. First, construct retaining piles in the soil, and then use pile foundation equipment to form inclined holes for the inclined bracing. Insert the inclined bracing into the inclined holes to the corresponding design elevation. S2. Fix the diagonal brace to the bottom plate of the box body, wherein the rotating parts inside the box body are in a state that can rotate and increase or decrease the distance between the top plate and the bottom plate; then adjust the bolts on the embedded rod to make the first spring and the second spring reach the preset value of the compression state, and then pour the support body to fix the embedded rod in the support body. S3. Slide the gear onto the connecting shaft, then install the support plate and side plate, and rotatably connect the gear and the side plate. Then slide the pressure rod onto the support plate and mesh the rack with the gear. Finally, fix the drive mechanism onto the support plate so that the output end of the drive mechanism is fixed to the pressure rod. S4. Then continue to excavate the soil. During the excavation process, the drive mechanism drives the rotating parts to rotate in order to adjust the support force on the retaining piles and diagonal braces. S5. After the foundation pit is excavated to the preset position, pour the concrete base slab.

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