CN219298232U

CN219298232U - Foundation pit slope steel support axial force compensation system

Info

Publication number: CN219298232U
Application number: CN202320291561.6U
Authority: CN
Inventors: 张卓; 赵殊才; 赵博; 王玉泽; 赵志宇; 李明聪; 陈昱希; 秦于胜
Original assignee: China Construction First Group Corp Ltd; China Construction First Bureau Group North China Construction Co Ltd
Current assignee: China Construction First Group Corp Ltd; China Construction First Bureau Group North China Construction Co Ltd
Priority date: 2023-02-23
Filing date: 2023-02-23
Publication date: 2023-07-04
Anticipated expiration: 2033-02-23

Abstract

The utility model relates to the technical field of building foundation pit construction, in particular to a foundation pit slope steel support axial force compensation system. The side slope of the foundation pit is provided with a concrete layer, a plurality of support shafts are transversely arranged in the foundation pit, two ends of each support shaft are detachably connected with a fixed seat, and the fixed seat is pre-buried and fixed in the concrete layer of the side slope of the foundation pit; the support shaft is provided with prestress of which the two ends outwards prop up foundation pit slopes, and a hydraulic cylinder is arranged on the support shaft; the supporting shaft is also provided with a sensor for detecting the axial force applied to the supporting shaft, the sensor is electrically connected with a controller, the controller is connected with and controls an oil pump system, and the oil pump system is connected with and drives a hydraulic cylinder through a hydraulic oil pipeline.

Description

Foundation pit slope steel support axial force compensation system

Technical Field

The utility model relates to the technical field of building foundation pit construction, in particular to a foundation pit slope steel support axial force compensation system.

Background

In the construction of the building, firstly, earth excavation is needed, foundation pit excavation is carried out, then subsequent construction is carried out, and the foundation pit is deeper when the building is bigger. However, in cities, the surrounding environment for constructing foundation pits is complex, or the foundation pits are adjacent to tall buildings or low facilities such as subway lines.

On the one hand, the slope angle of the foundation pit limited by the site can be larger, steeper and easier to slide. Disturbance to the soil layer easily affects surrounding subway lines or buildings, etc., so that the slope of the foundation pit needs to be additionally reinforced.

The support is further structured to be prestressed during installation. However, the reinforced steel structure is affected by thermal expansion and contraction or creep for a long time, the supporting acting force of the reinforced steel structure can be changed, and on-site personnel are difficult to monitor and adjust.

Disclosure of Invention

The utility model relates to a foundation pit slope steel support axial force compensation system.

The technical problems to be solved are as follows: the deformation of the steel support of the side slope of the building foundation pit is difficult to monitor and the size of the prestress is difficult to quickly adjust.

In order to solve the technical problems, the foundation pit slope steel support axial force compensation system adopts the following scheme.

The foundation pit slope steel support axial force compensation system is characterized in that a concrete layer is arranged on a foundation pit slope, a plurality of support shafts are transversely arranged in the foundation pit, two ends of each support shaft are detachably connected with a fixed seat, and the fixed seat is pre-buried and fixed in the concrete layer of the foundation pit slope;

the support shaft is provided with prestress of which the two ends outwards prop up foundation pit slopes, and a hydraulic cylinder is arranged on the support shaft; the supporting shaft is also provided with a sensor for detecting the axial force applied to the supporting shaft, the sensor is electrically connected with a controller, the controller is connected with and controls an oil pump system, and the oil pump system is connected with and drives a hydraulic cylinder through a hydraulic oil pipeline.

Preferably, the supporting shafts in the foundation pit are divided into a plurality of layers up and down, and a plurality of supporting shafts on each layer are arranged in parallel at intervals.

Preferably, a temporary supporting rod is fixed below any layer of supporting shaft, the temporary supporting rod is horizontally arranged and perpendicular to the supporting shaft above, a door-shaped fixing clamp is arranged on the temporary supporting rod, and the fixing clamp is clamped on the supporting shaft.

Preferably, the multi-layer support shaft is divided into an upper group and a lower group; the upper layers of support shafts are static shafts, the static shafts are steel shafts, and hydraulic cylinders are not arranged; the lower layers of support shafts are movable shafts, and hydraulic cylinders are arranged on the movable shafts.

Preferably, the foundation pit is internally provided with a filling pile which is vertically arranged, one end of the steel support props up the side slope of the foundation pit, the other end of the steel support is fixed on the filling pile, and the left side and the right side of the filling pile are connected with support shafts.

Preferably, a fixing seat for connecting the support shaft is arranged on the cast-in-place pile, and the fixing seat is fixed on the cast-in-place pile through an expansion bolt.

Preferably, the material that the back shaft was is the steel shaft, and it is fixed to form by the concatenation about the minor axis to be many, the pneumatic cylinder sets up the one end at the back shaft.

Compared with the prior art, the foundation pit slope steel support axial force compensation system has the following beneficial effects:

according to the utility model, firstly, the side slope of the foundation pit is supported by the transverse supporting shaft, meanwhile, the supporting shaft applies prestress through the hydraulic cylinder, and then the control system is utilized to dynamically adjust the magnitude of the prestress, so that automatic adjustment can be realized without special monitoring. And the set value of the prestress is convenient to adjust.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Reference numerals illustrate: 1-side slope, 2-concrete layer, 3-supporting shaft, 3 a-dead axle, 3 b-moving axle, 4-hydraulic cylinder and 5-filling pile.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

In the present utility model, unless otherwise indicated, terms of orientation such as "up, down, left, right" are used to refer generally to up, down, left, right as shown with reference to fig. 1; "inner and outer" means inner and outer relative to the contour of the respective parts themselves. The present utility model will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to solve the problem that the deformation of the steel support of the foundation pit slope 1 is difficult to monitor and the magnitude of the prestress is difficult to quickly adjust, the utility model provides a foundation pit slope steel support axial force compensation system, as shown in fig. 1.

The foundation pit slope steel support axial force compensation system is characterized in that a concrete layer 2 is arranged on a foundation pit slope 1, a plurality of support shafts 3 are transversely arranged in the foundation pit, two ends of each support shaft 3 are detachably connected with a fixed seat, and the fixed seat is pre-buried and fixed in the concrete layer 2 of the foundation pit slope 1;

the support shaft 3 is provided with prestress of which the two ends outwards prop up the foundation pit side slope 1, and the support shaft 3 is provided with a hydraulic cylinder 4; the supporting shaft 3 is also provided with a sensor for detecting the shaft force applied to the supporting shaft 3, the sensor is electrically connected with a controller, the controller is connected with and controls an oil pump system, and the oil pump system is connected with the hydraulic cylinder 4 through a hydraulic oil pipeline and drives the hydraulic cylinder 4.

The supporting shaft 3 is a long steel rod, and needs to have enough structural strength, and the supporting shaft 3 can be a steel truss or a thick steel tube. The density of the support shaft 3 is calculated and determined according to the actual condition of foundation pit construction. On the one hand, the fixing seat is pre-buried in advance in the concrete layer 2 of the foundation pit slope 1 so as to facilitate the installation and the setting of the supporting shaft 3, on the other hand, the fixing seat is provided with a pressure dividing plate, the pressure dividing plate is tightly attached to the surface of the concrete layer 2, and the area of the pressure dividing plate is larger than the cross section of the supporting shaft 3.

The sensor may be a stress sensor such as a metal strain gauge of the support shaft 3, or may be a hydraulic pressure sensor for the hydraulic cylinder 4, and then the actual shaft force of the support shaft 3 is calculated by sensing the size of the hydraulic cylinder 4. Then a target value is preset in the controller, the target value is compared with an actual value returned by the sensor, and the oil pressure of the hydraulic cylinder 4 is regulated in the control oil pump system.

As shown in fig. 1, the supporting shafts 3 in the foundation pit are divided into a plurality of layers up and down, and the plurality of supporting shafts 3 of each layer are arranged in parallel with each other at intervals. The entire foundation pit is high, so that the support shaft 3 needs to be divided into a plurality of layers. Preferably, the multi-layered support shaft 3 is aligned up and down. And the subsequent construction operation in the foundation pit is facilitated.

The below of arbitrary layer back shaft 3 is fixed with interim bracing piece, interim bracing piece level sets up and perpendicular to back shaft 3 of top, is provided with the fixing clip of door type on the interim bracing piece, and the fixing clip is blocked on back shaft 3.

The multi-layer support shaft 3 is divided into an upper group and a lower group;

the upper layers of support shafts 3 are static shafts 3a, the static shafts 3a are steel shafts, and hydraulic cylinders 4 are not arranged; the static shaft 3a is a simple steel shaft, and is fixed and can not stretch. The lower layers of support shafts 3 are movable shafts 3b, and hydraulic cylinders 4 are arranged on the movable shafts 3 b. The hydraulic cylinder 4 is arranged on the movable shaft 3b, and the axial force of the movable shaft 3b can be conveniently adjusted.

The foundation pit is internally provided with a filling pile 5 which is vertically arranged, one end of the steel support props up the side slope 1 of the foundation pit, the other end of the steel support is fixed on the filling pile 5, and the left side and the right side of the filling pile 5 are respectively connected with a support shaft 3. When the width of the foundation pit is too wide, the length of the supporting shaft 3 is too long, so that the filling pile 5 in the foundation pit is used for transition, one end of the supporting shaft 3 is fixed on the side slope 1, and then the other end of the supporting shaft is fixed on the filling pile 5. Meanwhile, in order to avoid overlarge bending moment born by the unilateral stress of the cast-in-place pile 5, the same cast-in-place pile 5 needs to be provided with support shafts 3 on the left side and the right side.

The cast-in-place pile 5 is provided with a fixing seat for connecting the support shaft 3, and the fixing seat is fixed on the cast-in-place pile 5 through expansion bolts. The fixing seat cannot be pre-buried on the cast-in-place pile 5, so that the fixing seat is preferably installed by adopting expansion bolts.

The material that back shaft 3 was is the steel axle, and it is fixed to form by the concatenation about with the minor axis to be many, pneumatic cylinder 4 sets up the one end at back shaft 3.

The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the design of the present utility model.

Claims

1. The foundation pit slope steel support axial force compensation system is characterized in that a concrete layer (2) is arranged on a side slope (1) of a foundation pit, a plurality of support shafts (3) are transversely arranged in the foundation pit, two ends of each support shaft (3) are detachably connected with a fixed seat, and the fixed seat is pre-buried and fixed in the concrete layer (2) of the side slope (1) of the foundation pit;

the support shaft (3) is provided with prestress of which the two ends are outwards propped against the foundation pit side slope (1), and the support shaft (3) is provided with a hydraulic cylinder (4); the supporting shaft (3) is also provided with a sensor for detecting the shaft force applied to the supporting shaft (3), the sensor is electrically connected with a controller, the controller is connected with and controls an oil pump system, and the oil pump system is connected with a hydraulic cylinder (4) through a hydraulic oil pipeline and drives the hydraulic cylinder (4).

2. The foundation pit slope steel support shaft force compensation system according to claim 1, wherein the support shafts (3) in the foundation pit are divided into a plurality of layers up and down, and a plurality of support shafts (3) of each layer are arranged in parallel and at intervals.

3. The foundation pit slope steel support shaft force compensation system according to claim 2, wherein a temporary support rod is fixed below any layer of support shaft (3), the temporary support rod is horizontally arranged and perpendicular to the support shaft (3) above, a door-shaped fixing clamp is arranged on the temporary support rod, and the fixing clamp is clamped on the support shaft (3).

4. A foundation pit slope steel support shaft force compensation system according to claim 2, wherein the multi-layer support shafts (3) are divided into an upper group and a lower group;

the upper layers of support shafts (3) are static shafts (3 a), the static shafts (3 a) are steel shafts, and hydraulic cylinders (4) are not arranged;

the lower layers of support shafts (3) are moving shafts (3 b), and hydraulic cylinders (4) are arranged on the moving shafts (3 b).

5. The foundation pit slope steel support axial force compensation system according to claim 1, wherein the foundation pit is internally provided with a filling pile (5) which is vertically arranged, one end of the steel support props the slope (1) of the foundation pit, the other end of the steel support is fixed on the filling pile (5),

the left side and the right side of the filling pile (5) are both connected with a supporting shaft (3).

6. Foundation pit slope steel support axial force compensation system according to claim 5, characterized in that the bored concrete pile (5) is fitted with a fixing base for connecting the support shaft (3), which fixing base is fixed to the bored concrete pile (5) by means of expansion bolts.

7. The foundation pit slope steel support shaft force compensation system according to claim 1, wherein the support shaft (3) is made of a steel shaft and is formed by splicing and fixing a plurality of short shafts left and right, and the hydraulic cylinder (4) is arranged at one end of the support shaft (3).