Back leaning counter-force system for long and narrow starting working well of rectangular pipe jacking

Abstract

The utility model discloses a back leaning counter-force system of a rectangular pipe jacking long and narrow starting working well, which comprises two stand columns corresponding to the upper part of a pipe jacking machine and the position of a middle oil cylinder jack, the stand columns are provided with abutments, the abutments correspond to the position of an oil cylinder jack at the bottom of the pipe jacking machine, the abutments and the stand columns are arranged in front of a structural side wall, and the structural side wall is provided with an oil cylinder. A fender post is arranged behind the structural side wall, a back reinforcing soil body is arranged behind the fender post, a steel plate back rest is arranged in front of the abutment and the stand column, and fine aggregate concrete filling bodies are poured between the steel plate back rest and the abutment and between the steel plate back rest and the stand column. And an upper horizontal dowel bar and a lower horizontal dowel bar are arranged between each upright post and the structural side wall. The device can be used for a long and narrow starting working well of the rectangular jacking pipe; in the whole pipe jacking construction process, stress and force transmission of the counter-force system are clear, and the safety of starting, jacking and receiving of the pipe jacking can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe jacking construction, in particular to a back-reaction force system for a narrow and long starting working shaft of a rectangular pipe jacking. Background Art

[0002] During rectangular pipe jacking, a starting pit must be arranged to ensure a smooth launch of the pipe jacking machine. Typically, a reinforced concrete reaction wall is cast separately on the sidewall of the structure as a reaction member during the pipe jacking process, primarily to withstand the full horizontal thrust during the forward advancement of the pipe. However, when the working pit is long, casting a reaction wall alone cannot meet the actual site requirements. Therefore, a new back-reaction system is needed for the narrow and long starting pit of rectangular pipe jacking. Utility Model Content

[0003] The utility model aims to solve the technical problems existing in the known technology and provides a rear leaning reaction force system for a narrow and long starting working shaft of a rectangular jacking pipe.

[0004] The utility model adopts the following technical solutions to solve the technical problems existing in the known technology: a rear leaning reaction force system for a narrow and long starting working shaft of a rectangular jacking pipe, comprising two columns corresponding to the positions of the upper and middle oil cylinder jacks of the pipe jacking machine, the columns are provided with piers, the piers correspond to the positions of the bottom oil cylinder jacks of the pipe jacking machine, the piers and the columns are arranged in front of the side walls of the structure, retaining piles are provided behind the side walls of the structure, and back reinforcement soil is provided behind the retaining piles, a steel plate rear backrest is provided in front of the piers and the columns, a fine stone concrete filling body is cast between the steel plate rear backrest and the piers and the columns, and two upper and lower horizontal force transmission rods are provided between each of the columns and the side walls of the structure.

[0005] The pier is anchored to the bottom plate of the structure, and the upper end of the column is anchored to the top plate of the structure.

[0006] The horizontal force transmission rod is made of a steel pipe, and its two ends are connected to the column and the structural side wall through a pre-buried steel plate.

[0007] The cross section of the pier is L-shaped and is provided with an overhanging section extending rearward and toward the middle.

[0008] The retaining piles are construction piles.

[0009] The advantages and positive effects of the present invention are as follows: relying on the structural side walls and the retaining piles and back reinforced soil behind them, the reaction force position is moved forward from the structural side walls to the columns with the help of horizontal force transmission rods, and it can be used for the narrow starting working well of rectangular jacking pipes. After the columns of the system receive the back thrust of the oil cylinder, part of it is transferred to the structural bottom plate, and the other part is transferred to the horizontal force transmission rods, and the horizontal force transmission rods are transferred to the structural side walls and the rear reinforced soil layer; the force-bearing performance of the system can be further improved by anchoring the piers and the upper ends of the columns in the structure. During the entire jacking construction process, the reaction system has clear force and force transmission, which can ensure the safety of the jacking start, jacking and reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 for Figure 1 A top view of

[0012] Figure 3 It is a structural schematic diagram of the pier, column and horizontal force transmission rod of the utility model.

[0013] In the figure: 1. Column; 2. Pier; 3. Horizontal force transmission rod; 4. Fine stone concrete filling body; 5. Steel plate backrest; 6. Cylinder frame; 7. Cylinder jack; 8. Structural bottom plate; 9. Structural top plate; 10. Rectangular pipe jacking machine; 11. Track beam; 12. Structural side wall; 13. Retaining piles; 14. Back reinforcement soil. DETAILED DESCRIPTION

[0014] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0015] See also Figures 1 to 3 A rearward reaction force system for a rectangular jacking pipe with a narrow starting working well includes two columns 1 corresponding to the positions of the upper and middle cylinder jacks 7 of the jacking machine. The columns 1 are provided with piers 2, and the piers 2 correspond to the positions of the bottom cylinder jacks 7 of the jacking machine.

[0016] The pier 2 and the column 1 are arranged in front of the structural side wall 12, and a retaining pile 13 is provided behind the structural side wall 12, and a back reinforcement soil body 14 is provided behind the retaining pile 13.

[0017] A steel plate backrest 5 is provided in front of the pier 2 and the column 1 , and a fine stone concrete filling body 4 is cast between the steel plate backrest 5 and the pier 2 and the column 1 .

[0018] Two upper and lower horizontal force transmission rods 3 are provided between each of the columns 1 and the structural side walls 12 .

[0019] The more preferred solution of this embodiment is as follows:

[0020] The pier 2 is anchored to the structural bottom plate 8, and the upper end of the column 1 is anchored to the structural top plate 9, which can improve the force-bearing performance of the reaction system.

[0021] The horizontal force transmission rod 3 is made of a steel pipe, and its two ends are connected to the column 1 and the structural side wall 12 through a pre-buried steel plate, and the connection is stable and reliable.

[0022] The cross section of the pier 2 is L-shaped and is provided with outward extension sections extending toward the rear and toward the middle, which can improve the force-bearing performance of the reaction system.

[0023] The retaining piles 13 are construction piles.

[0024] The construction and working principle of this utility model:

[0025] During the reinforcement tying process for the structural base plate 8, pre-embed the connecting steel bars for pier 2 and column 1. After the structural base plate 8 is cast, the steel bars for column 1 and pier 2 are tied, and then the columns 1 and pier 2 are cast. Column 1 is cast to 50 cm below the structural top plate 9, and the upper end of column 1 is cast together with the top plate 9. During the reinforcement tying process for column 1 and the structural side wall 12, pre-embedded steel plates are pre-placed for later connection with the horizontal force transmission rods 3.

[0026] When the track beam 11 is cast and reaches the designed strength, it is hoisted into the well and the rectangular pipe jacking machine 10 is assembled. The front and rear spaces are adjusted, the steel plate backrest 5 is hoisted and lowered, and after leveling and positioning, the gap between it and the column 1 and the pier 2 is cast to form a fine stone concrete filling body 4, followed by the installation of the cylinder frame 6 and the cylinder jack 7. When all the work is completed, the starting tunnel portal steel is removed, and the jacking is started into the tunnel. During the entire jacking period, the horizontal reaction force generated by the jacking thrust is transmitted to the pier 2 and the column 1 through the steel plate backrest 5, a part of which is transmitted to the structural bottom plate 8 by the pier 2, and the other part is transmitted to the rear retaining pile 13 and the back reinforcement soil 14 through the horizontal force transmission rod 3.

[0027] The above reaction force system has been verified by establishing Midas finite element simulation and taking a certain safety factor into consideration.

[0028] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. A back-reaction force system for a narrow and long rectangular jacking pit, characterized in that: It includes two columns corresponding to the upper and middle cylinder jack positions of the pipe jacking machine, the columns are provided with piers, and the piers correspond to the positions of the bottom cylinder jacks of the pipe jacking machine. The piers and the columns are arranged in front of the structural side walls, and retaining piles are provided behind the structural side walls. Back reinforcement soil is provided behind the retaining piles. A steel plate backrest is provided in front of the piers and the columns, and fine stone concrete filling is poured between the steel plate backrest and the piers and the columns. Two upper and lower horizontal force transmission rods are provided between each of the columns and the structural side walls.

2. The back-reaction force system for the narrow and long starting working pit of rectangular jacking pipe according to claim 1 is characterized in that: The pier is anchored to the bottom plate of the structure, and the upper end of the column is anchored to the top plate of the structure.

3. The back-reaction force system for a narrow and long rectangular jacking starting working pit according to claim 1 is characterized in that: The horizontal force transmission rod is made of a steel pipe, and its two ends are connected to the column and the structural side wall through a pre-buried steel plate.

4. The back-reaction force system for a narrow and long rectangular jacking starting working shaft according to claim 1 is characterized in that: The cross section of the pier is L-shaped and is provided with an overhanging section extending rearward and toward the middle.

5. The back-reaction force system for a narrow and long rectangular jacking starting working shaft according to claim 1 is characterized in that: The retaining piles are construction piles.

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