Foundation pit supporting structure under high-speed rail bridge with limited construction space

Abstract

The utility model discloses a foundation pit supporting structure used under a high-speed railway bridge with limited construction space, and belongs to the technical field of construction foundation pit supporting. A plurality of stand columns are arranged on the two sides of a foundation pit at intervals correspondingly, the stand columns on the two sides of the foundation pit are arranged correspondingly, the lower ends of the stand columns are inserted into soil at the bottom of the foundation pit, conical tip parts are arranged at the lower ends of the stand columns, inserting grooves in the height direction of the stand columns are formed in the two sides of the stand columns, and steel breast boards are arranged between the adjacent stand columns. The two sides of the steel soil retaining plate are inserted into the inserting grooves of the corresponding stand columns, the steel soil retaining plate and the stand columns are fixedly connected into a whole through fixing frames and bolts, a tool type cross brace with the adjustable length is arranged between the stand columns on the two sides of the foundation pit, and the two ends of the tool type cross brace abut against the stand columns on the two sides of the foundation pit respectively. The supporting structure is simple in construction, the difficulty that the construction space of the foundation pit under the railway bridge is limited can be overcome to the greatest extent, the supporting cost can be reduced, and the construction difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of foundation pit support structure when high-speed rail bridge under construction space is limited, belong to construction foundation pit support technical field. BACKGROUND

[0002] In recent years, with the vigorous promotion of urban underground pipe network reconstruction, the vigorous implementation of urban drainage flood control capacity improvement project, etc., the project of municipal pipeline under high-speed rail bridge gradually increases. When the municipal pipeline foundation pit construction crosses railway bridge, the deformation of high-speed rail bridge should be strictly controlled, and the adverse effects on adjacent high-speed rail piers caused by foundation pit excavation construction should be minimized, otherwise it will affect the normal operation of high-speed railway, and even endanger the safety of driving.

[0003] The traditional foundation pit support method such as static pressure pile, high pressure rotary jet pile and other soil squeezing piles has great influence on high-speed railway bridge. The specification suggests that drilling piles should be preferred in underpass engineering, and soil squeezing piles should be avoided in the range of high-speed railway influence area. Usually, in order to save the investment of support structure, foundation pits within 3m can use steel sheet pile support, but when the net height under high-speed rail bridge is not greater than 6m, steel sheet pile support cannot be used. CONTENT OF UTILITY MODEL

[0004] The purpose of the utility model is to provide a kind of foundation pit support structure suitable for high-speed rail bridge under construction space is limited and can reduce the cost of support.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme: a kind of foundation pit support structure when high-speed rail bridge under construction space is limited, characterized by: a plurality of columns are arranged at intervals on both sides of the foundation pit, the columns on both sides of the foundation pit are correspondingly arranged, the lower end of the column is inserted into the soil at the bottom of the foundation pit, and the lower end of the column has a tapered tip, the two sides of the column are provided with a slot along the height direction, a steel retaining plate is arranged between adjacent columns, the two sides of the steel retaining plate are inserted into the corresponding slot of the column, and the steel retaining plate is fixedly connected with the column by the fixing frame and the bolt to form an integral whole, a length-adjustable tool type cross brace is arranged between the columns on both sides of the foundation pit, and the two ends of the tool type cross brace are tightly pressed against the columns on both sides of the foundation pit.

[0006] In the utility model, the column is inserted into the soil at the bottom of the foundation pit, each steel retaining plate is inserted into the slot on the column and fixedly connected with the column by the fixing frame and the bolt to form an integral whole, and the columns on both sides of the foundation pit are supported by the tool type cross brace, thereby forming a stable foundation pit support structure.

[0007] Further, the column is an H-shaped steel to improve the strength of the support structure and facilitate construction.

[0008] Further, a rubber sealing strip is arranged between the steel retaining plate and the slot of the column. The rubber sealing strip can enhance the sealing property.

[0009] Furthermore, to facilitate construction, the tool-type cross brace includes two standard steel pipe cross braces and an adjusting screw connecting the two standard steel pipe cross braces. Both ends of the standard steel pipe cross braces are provided with internal threads, and both ends of the adjusting screw are threadedly connected to the two standard steel pipe cross braces respectively. The distance between the two standard steel pipe cross braces can be adjusted by adjusting the screw, thereby adjusting the length of the tool-type cross brace so that both ends of the tool-type cross brace can be firmly pressed against the columns on both sides of the foundation pit. The appropriate length of standard steel pipe cross brace can be selected according to the width of the foundation pit, which can speed up the construction process.

[0010] Furthermore, the depth to which the column is inserted into the soil at the bottom of the foundation pit is 500mm-600mm.

[0011] The beneficial effects of this utility model are as follows: This utility model has a simple structure. By inserting the column into the soil at the bottom of the foundation pit, and by inserting the steel retaining plate into the slot on the column and fixing it to the column with the fixing frame and bolts to form an integral whole, the column on both sides of the foundation pit is supported by the tool-type horizontal brace, thereby forming a stable foundation pit support structure that can meet the construction requirements. Moreover, this utility model can be constructed under conditions of limited construction space, which can overcome the difficulty of limited construction space under railway bridge foundation pits to the greatest extent, effectively reducing the adverse effects of municipal pipelines passing through on adjacent high-speed railway bridge piers. At the same time, the structure and construction of this utility model are simple, which can reduce support costs, reduce construction difficulty, and ensure the safety of railway operation to the greatest extent. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a side view of the present invention;

[0014] Figure 3 This is a top view of the connection between the steel retaining plate and the column in this utility model;

[0015] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the diagram;

[0016] Figure 5 This is a schematic diagram of the tool-type cross brace in this utility model;

[0017] Figure 6 This is a schematic diagram of the standard steel pipe cross brace in this utility model;

[0018] In the diagram: 1. Column, 2. Tool-type cross brace, 3. Foundation pit, 4. Steel retaining plate, 5. Fixing frame, 6. Bolt, 7. Rubber sealing strip;

[0019] 1.1 Slot; 2.1 Standard steel pipe cross brace; 2.1.1 Steel pipe; 2.1.2 Fixing block; 2.2 Adjusting screw. Detailed Implementation

[0020] The present invention will be further described below through non-limiting embodiments and in conjunction with the accompanying drawings:

[0021] As shown in the attached diagram, a foundation pit support structure for construction under a high-speed railway bridge with limited space includes several columns 1 spaced apart on both sides of the foundation pit 3. The columns 1 on both sides of the foundation pit are correspondingly positioned. Each column 1 has a conical tip at its lower end, which is inserted into the soil at the bottom of the foundation pit 3. Each column 1 has a slot 1.1 along its height on both sides. A steel retaining plate 4 is installed between adjacent columns 1, with both sides of the steel retaining plate 4 inserted into the slots 1.1 of the corresponding columns 1. The steel retaining plate 4 is fixedly connected to the columns 1 by bolts 6 using a fixing frame 5. To enhance sealing, a rubber sealing strip 7 is preferably installed between the steel retaining plate 4 and the slots 1.1 of the columns. An adjustable-length tool-type cross brace 2 is installed between the columns 1 on both sides of the foundation pit 3, with both ends of the tool-type cross brace 2 pressing against the columns 1 on both sides of the foundation pit.

[0022] In this utility model, the column 1 is preferably made of H-beam steel.

[0023] To ensure the stability of column 1, preferably, the depth to which column 1 is inserted into the soil at the bottom of the foundation pit is 500mm-600mm.

[0024] In this utility model, the tool-type cross brace 2 includes two standard steel pipe cross braces 2.1 and an adjusting screw 2.2 connecting the two standard steel pipe cross braces 2.1. The standard steel pipe cross braces 2.1 are made of steel pipe, and both ends of the steel pipe 2.1.1 are provided with internal threads. Fixing blocks 2.1.2 for easy tool operation are fixed to the external ends of both ends of the steel pipe 2.1.1. The two ends of the adjusting screw 2.2 are threadedly connected to the two standard steel pipe cross braces respectively. To improve the adaptability of the tool-type cross brace, the standard steel pipe cross braces 2.1 can be designed with various lengths, such as 500mm, 1000mm, 1500mm, 2000mm, 2500mm, 3000mm, etc., which can be selected according to the width of the foundation pit during use.

[0025] This utility model is applicable to foundation pits less than 3m deep and in areas without groundwater. It can be used when municipal pipelines are shallowly buried, when clearance under high-speed railway bridges is limited, or when driven piles such as sheet piles cannot meet the required clearance.

[0026] During construction of this utility model, when excavating the pipeline foundation pit, a column 1 should be pre-inserted. The end of the column 1 should be cut into a conical shape to facilitate better insertion into the soil. After the tool-type cross brace 2 is tightened against the columns on both sides of the foundation pit, a steel retaining plate 4 is inserted between the columns, and a rubber sealing strip 7 is installed between the steel retaining plate 4 and the slot of the column 1. Then, the steel retaining plate 4 and the column 1 are fixed together by bolts using a fixing frame 5. If the soil in the foundation pit is hard, a pre-drilling method can be used for construction.

[0027] The other parts in this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A foundation pit support structure for construction under high-speed railway bridges when construction space is limited, characterized in that: Several columns are set at intervals on both sides of the foundation pit, with corresponding columns on both sides. The lower end of each column is inserted into the soil at the bottom of the foundation pit and has a conical tip. Slots along the height direction are provided on both sides of each column. Steel retaining plates are installed between adjacent columns, with both sides of the steel retaining plates inserted into the slots of the corresponding columns. The steel retaining plates are fixedly connected to the columns by fixing frames and bolts. Adjustable tool-type cross braces are installed between the columns on both sides of the foundation pit, with both ends of the tool-type cross braces pressing against the columns on both sides of the foundation pit.

2. The foundation pit support structure under a high-speed railway bridge with limited construction space as described in claim 1, characterized in that: The column is made of H-beam steel.

3. The foundation pit support structure under a high-speed railway bridge with limited construction space as described in claim 2, characterized in that: A rubber sealing strip is installed between the steel retaining plate and the slot of the column.

4. The foundation pit support structure under a high-speed railway bridge with limited construction space according to claim 1, 2, or 3, characterized in that: The tool-type cross brace includes two standard steel pipe cross braces and an adjusting screw connected between the two standard steel pipe cross braces. Both ends of the standard steel pipe cross brace are provided with internal threads, and both ends of the adjusting screw are threadedly connected to the two standard steel pipe cross braces respectively.

5. The foundation pit support structure under a high-speed railway bridge with limited construction space as described in claim 4, characterized in that: The depth to which the column is inserted into the soil at the bottom of the foundation pit is 500mm-600mm.

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