CN221855535U - A grouting oblique force-bearing body suitable for foundation pit rescue - Google Patents

Abstract

The utility model relates to the technical field of civil engineering, in particular to a grouting oblique stress body suitable for foundation pit rescue, which comprises an oblique rigid part, a grouting body, a reinforcement cushion layer and a limiting device, wherein the oblique rigid part is obliquely arranged, one end of the oblique rigid part is connected with the top of an enclosure structure through the limiting device, the other end of the oblique rigid part penetrates through the reinforcement cushion layer arranged at the bottom of a foundation pit and is inserted into the soil body at the bottom of the foundation pit, and the grouting body is arranged at the peripheral position of the portion of the oblique rigid part inserted into the soil body at the bottom of the foundation pit. The utility model has the advantages that: deformation development can be effectively limited, foundation pit risks are reduced, and earth excavation and underground structure construction are ensured to be carried out smoothly; the method has the advantages of simple construction method, high construction speed, short maintenance time, applicability to different building enclosures, no larger requirement on construction space, good deformation limiting effect, no need of providing counter force by using a main structure, low cost and the like.

Description

A grouting oblique force-bearing body suitable for foundation pit rescue

Technical Field

The utility model relates to the technical field of civil engineering, in particular to a grouting oblique force-bearing body suitable for foundation pit rescue.

Background Art

When carrying out foundation pit projects with large areas, deep excavation depths and complex environments in deep soft soil areas, fast excavation speeds can easily lead to greater stress on the foundation pit retaining structures, larger displacements and even landslides, making the construction more dangerous.

Summary of the invention

The purpose of the utility model is to provide a grouting inclined force-bearing body suitable for foundation pit rescue in accordance with the above-mentioned deficiencies of the prior art. The utility model provides a grouting inclined force-bearing body suitable for foundation pit rescue, by arranging the inclined force-bearing body inside the foundation pit, improving the bearing capacity by grouting, arranging a reinforcement cushion layer at the bottom of the foundation pit, and arranging a limit device at the top of the ring beam. By fully welding the inclined force-bearing body and the limit device, a stable force system is formed, thereby stabilizing the deformation of the foundation pit, which can be used as an important means for foundation pit rescue.

The purpose of this utility model is achieved by the following technical solutions:

A grouting oblique force-bearing body suitable for foundation pit rescue, characterized in that it includes an oblique rigid member, a grouting body, a reinforcement cushion layer and a limiting device, wherein the oblique rigid member is arranged obliquely, one end of which is connected to the top of the retaining structure through the limiting device, and the other end passes through the reinforcement cushion layer arranged at the bottom of the foundation pit and is inserted into the soil at the bottom of the foundation pit, and the grouting body is arranged at the outer position of the part of the oblique rigid member inserted into the soil at the bottom of the foundation pit.

A flexible constraint body is arranged at the periphery of the oblique force-bearing body, and the grouting body is a cement-soil enlarged body, which forms an enlarged body at the end of the oblique rigid pile through the flexible constraint body.

The reinforced cushion layer is a C30 concrete cushion layer with double-layer bidirectional steel bars.

The enclosure structure is one of a gravity dam, double-row construction piles, and double-row cast-in-place piles. The top of the enclosure structure has a pressure top, and the limiting device is fixedly connected to the pressure top.

The limiting device is an L-shaped steel plate facing the inner side of the foundation pit.

The oblique rigid member is provided with a water stop member where it passes through the foundation pit bottom plate and the structural outer wall.

The water stop members are arranged in a circle along the periphery of the inclined rigid body. The water stop members located at the bottom plate of the foundation pit are arranged horizontally, and the water stop members located at the outer wall of the structure are arranged vertically. Each of the water stop members is arranged at the center position of the plate thickness of the bottom plate or the outer wall of the structure.

The oblique rigid member is a hollow rigid structure, which is one or more combinations of steel pipe piles, prefabricated pipe piles, prefabricated square piles, steel lattice columns and spiral steel pipe piles.

The advantages of the utility model are: it can effectively limit the development of deformation, reduce the risk of foundation pits, and ensure the smooth progress of earth excavation and underground structure construction; it has the advantages of simple construction method, fast construction speed, short maintenance time, applicability to different retaining structures, no large requirements for construction space, good deformation limitation effect, no need to use the main structure to provide reaction force, and low cost. After the construction is completed, strength can be quickly formed, which can save precious time in the process of foundation pit rescue; in the process of earth excavation of deep and large foundation pits, the risks brought by earth excavation can be effectively controlled, and the non-convergent deformation of the foundation pit can be effectively suppressed, which can play an important role in the process of foundation pit rescue.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of the utility model.

DETAILED DESCRIPTION

The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

As shown in FIG. 1 , marks 1-8 in the figure respectively represent: retaining structure 1, ring beam 2, inclined load-bearing body 3, grouting expansion body 4, water-stop steel sheet 5, bottom plate 6, reinforcement cushion layer 7, and limiting device 8.

Embodiment: As shown in Figure 1, the grouting inclined force-bearing body suitable for foundation pit rescue in this embodiment can solve the problem of emergency rescue work when the retaining structure 1 of a deep and large foundation pit shows a tendency to deform significantly or has already undergone significant deformation, effectively stabilize the deformation of the foundation pit, and ensure safe and smooth construction.

Specifically, as shown in FIG1 , a retaining structure 1 is provided in the foundation pit, and the retaining structure 1 is used to support the soil outside the pit. The retaining structure 1 can be in various forms such as steel sheet piles, prefabricated sheet piles, construction piles, gravity dams, cast-in-place piles, and double-row piles, and effective water-stopping measures can be combined. A ring beam 2 is provided on the top of the retaining structure 1 as a top pressure.

As shown in FIG1 , the material used for the main part of the oblique force-bearing body 3 can be one or more combinations of steel pipe piles, prefabricated pipe piles, prefabricated square piles, steel lattice columns and spiral steel pipe piles. The specific selection can be flexibly selected according to the required single pile bearing capacity, stratum and other conditions. For example, the diameter of the steel pipe can range from 219mm to 426mm, and the wall thickness can be 8-10mm.

The oblique force-bearing body 3 is arranged at a certain angle, and the top end is connected to the top position of the ring beam 2 through a stopper 8. In this embodiment, the stopper 8 is an L-shaped steel plate, the horizontal part of which is reliably fixedly connected to the ring beam 2 through rivets, screws and other connectors, and the vertical part is adjacent to one side of the foundation pit and is used to be fixedly connected to the top of the oblique force-bearing body 3. The other end of the oblique force-bearing body 3 passes through the bottom plate 6 arranged in the foundation pit and is inserted into the soil at the bottom of the foundation pit.

As shown in FIG1 , a water-stop steel sheet 5 is horizontally arranged at the position where the oblique force-bearing body 3 is inserted through the bottom plate 6. The water-stop steel sheet 5 is arranged in a circle along the periphery of the oblique force-bearing body 3 and is arranged at the center of the plate thickness of the bottom plate 6. In this embodiment, the situation shown in FIG1 is a situation where only the bottom plate 6 is arranged in the foundation pit. If a structural outer wall is also arranged in the foundation pit, the oblique force-bearing body 3 may need to pass through the structural outer wall; at this time, a water-stop is also arranged at the position where the oblique force-bearing body 3 passes through, for example, the water-stop steel sheet 5 in this embodiment is also used, and the water-stop is arranged in the vertical direction and is also arranged at the center of the plate thickness of the bottom plate to ensure the water-stop effect.

As shown in FIG1 , the oblique force-bearing body 3 is provided with a grouting expansion body 4, and the formation of the grouting expansion body 4 can be a bag type or a non-bag type, which is determined according to the geological conditions. The bag type refers to setting a flexible constraint body (bag) on the periphery of the oblique force-bearing body 3, and the grouting body is a cement soil expansion body, and the cement soil is constrained by the flexible constraint body to form an expansion body at the end position where the oblique force-bearing body 3 is inserted into the soil body; the non-bag type refers to directly forming the grouting expansion body 4 on the periphery of the oblique force-bearing body 3 by grouting.

As shown in FIG1 , this embodiment has the following construction method:

(1) First, the site is leveled to leave a working platform for construction, and the enclosure structure 1 and the oblique force-bearing body 3 are accurately placed. The oblique force-bearing body 3 is constructed and the sinking of the oblique force-bearing body 3 can be carried out by hydraulic or mechanical vibration.

(2) Place the grouting equipment at the location of the grouting expansion body 4, and grout the grouting expansion body 4. Stop grouting after grouting to the required grouting volume or reaching a certain grouting pressure. The grouting pressure can generally be set to 1-2 MPa.

(3) After the grouting of the oblique load-bearing body 3 is completed, the limiting device 8 is reliably connected to the oblique load-bearing body 3 by welding (welding method). In this process, the limiting device 8 and the oblique load-bearing body 3 are simultaneously constructed on the ring beam 2 of the enclosure structure 1.

(4) After the deformation of the foundation pit is effectively controlled, the next step of earth excavation can be carried out. After the earth excavation is completed to the bottom, the reinforced cushion layer 7 must be constructed in time. The reinforced cushion layer 7 can be made of C30 concrete cushion layer with double-layer bidirectional HRB335 steel bars with a diameter of 10 mm.

In order to ensure the waterproof effect of the main structure, a water-stop steel sheet 5 should be arranged at the bottom plate position when constructing the bottom plate 6 to ensure that the water-stop steel sheet 5 is fully welded to the oblique force-bearing body 3 .

Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims (8)

1. A grouting oblique force-bearing body suitable for foundation pit rescue, characterized in that it includes an oblique rigid member, a grouting body, a reinforcement cushion layer and a limiting device, wherein the oblique rigid member is arranged obliquely, one end of which is connected to the top of the enclosure structure through the limiting device, and the other end passes through the reinforcement cushion layer arranged at the bottom of the foundation pit and is inserted into the soil at the bottom of the foundation pit, and the grouting body is arranged at the outer position of the part of the oblique rigid member inserted into the soil at the bottom of the foundation pit. 2. According to claim 1, a grouting inclined force-bearing body suitable for foundation pit rescue is characterized in that a flexible constraint body is arranged on the periphery of the inclined force-bearing body, and the grouting body is a cement-soil expansion body, which forms an expansion body at the end of the inclined rigid pile through the flexible constraint body. 3. A grouting oblique force-bearing body suitable for foundation pit rescue according to claim 1, characterized in that: the reinforcement cushion layer is a C30 concrete cushion layer with double-layer bidirectional steel bars inside. 4. A grouting oblique force-bearing body suitable for foundation pit rescue according to claim 1, characterized in that: the retaining structure is one of a gravity dam, a double-row construction pile, and a double-row cast-in-place pile, the top of the retaining structure has a pressure top, and the limiting device is fixedly connected to the pressure top. 5. A grouting oblique force-bearing body suitable for foundation pit rescue according to claim 1 or 4, characterized in that: the limiting device is an L-shaped steel plate facing the inner side of the foundation pit. 6. A grouting oblique force-bearing body suitable for foundation pit rescue according to claim 1, characterized in that: the oblique rigid member is provided with a water stop member at the place where it passes through the foundation pit bottom plate and the outer wall of the structure. 7. A grouting inclined force-bearing body suitable for foundation pit rescue according to claim 6, characterized in that: the water stop parts are arranged in a circle along the periphery of the inclined rigid body, the water stop parts located on the foundation pit bottom plate are arranged in a horizontal direction, and the water stop parts located on the outer wall of the structure are arranged in a vertical direction, and each of the water stop parts is arranged at the center position of the plate thickness of the bottom plate or the outer wall of the structure. 8. A grouting oblique force-bearing body suitable for foundation pit rescue according to claim 1, characterized in that the oblique rigid member is a hollow rigid structure, which is a combination of one or more of steel pipe piles, prefabricated pipe piles, prefabricated square piles, steel lattice columns and spiral steel pipe piles.