Prefabricated intermediate jacking pipe for pipe-jacking tunnel

Abstract

The invention discloses a jacking pipe joint prefabricated intermediate jacking pipe, and relates to the field of underground tunnel jacking pipe equipment. In long-distance pipe jacking construction, a tunnel needs to be divided into a plurality of sections and pushed forwards in a segmented mode through an intermediate jacking station, the jacking force of each section of the tunnel is reduced to be within the allowable jacking force range, and according to a traditional pipe jacking intermediate jacking station method, intermediate jacking station pipes are placed in advance or temporary drilling and steel bar planting are conducted to install the intermediate jacking station, so that cost is high, and the construction period is affected; and the overall waterproof performance and the structural strength of the tunnel can be weakened. The jacking pipe joint structure comprises a jacking pipe joint and an inner intermediate jacking station, an embedded steel ring is arranged on the jacking pipe joint, the embedded steel ring is fixedly connected with the pipe joint through a straight anchor bar, the inner intermediate jacking station is arranged on the embedded steel ring, the inner intermediate jacking station is rapidly and fixedly connected with the embedded steel ring through welding, and a hydraulic jack is arranged in the inner intermediate jacking station. Auxiliary jacking of the front tunnel pipe joint can be conveniently and rapidly achieved, the locking pipe joint escape efficiency is greatly improved, and the influence on the overall waterproof performance and structural strength of a tunnel is reduced.

Description

Technical Field

[0001] The invention relates to the field of underground tunnel jacking equipment, in particular to a prefabricated relay pipe for a jacking tunnel. Background Art

[0002] With the continuous improvement of construction technology and the continuous acceleration of urbanization, long-distance pipe jacking construction has gradually replaced slotted pipe burying and traditional short-distance pipe jacking, becoming the mainstream implementation method for underground large-diameter pipeline construction. Generally speaking, in long-distance pipe jacking construction, the total jacking force will be greater than the maximum thrust that the pipe section can withstand and the maximum allowable jacking force of the back seat, so it is necessary to use a relay room to divide the tunnel into several sections, and push forward in sections to reduce the jacking force of each section of the tunnel to within the allowable jacking force range.

[0003] Traditional relay room layout methods are usually divided into two situations. The first is to place relay room pipes according to theoretical calculations during the pipe jacking process. Generally, the first section of the relay room should be placed in a relatively forward position. When the total thrust reaches 40%~60% of the total thrust of the relay room, the first section of the relay room should be placed. After that, every time the thrust reaches 70%~80% of the total thrust of the relay room, a relay room should be placed. The second is that during the pipe jacking process, due to soil changes, equipment failures, insufficient mud injection and other reasons, the pipe jacking is locked, and it is necessary to enter the tunnel to add relay rooms by drilling and planting reinforcement between the pipe sections. However, both of the above methods have disadvantages. In the former, if the pipe jacking is successful and the underground soil is good, there is no need for relay rooms to assist in jacking, which will affect the project schedule and the waterproof performance of the tunnel and increase the cost; the latter requires drilling and planting reinforcement on the tunnel pipe section to fix the relay room, which will not only affect the construction period, but also weaken the waterproof performance and overall strength of the pipe section. Summary of the invention

[0004] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions and provide a prefabricated intermediate pipe for a jacking tunnel, so as to reduce the impact on the quality and construction period of the tunnel and improve the economic efficiency. To this end, the present invention adopts the following technical solutions.

[0005] A prefabricated relay room for a jacking tunnel comprises a jacking pipe section and an inner relay room, wherein the jacking pipe section is provided with an embedded steel ring, an interface steel sleeve ring, a socket steel ring and a spigot steel ring; the inner relay room is located on the embedded steel ring, and is a hydraulic jacking structure; the embedded steel ring is located on the inner side of the socket and spigot between the front and rear jacking pipe sections; the interface steel sleeve ring is located on the outer side of the socket of the jacking pipe section; the socket steel ring is located on the inner side of the socket of the jacking pipe section; the spigot steel ring is located on the inner side of the spigot of the jacking pipe section. During normal jacking, the prefabricated relay pipe is pushed into the tunnel by the main jack and used as an ordinary pipe segment. When the pipe segment is locked, the triangle plate and the back plate can be quickly welded to the embedded steel ring of the prefabricated relay pipe, and then a fixed hydraulic jack is installed between the back plates to implement segmented jacking of the jacking tunnel, which can quickly and conveniently help the pipe segment to get out of trouble. At the same time, the jacking force on each tunnel pipe segment is within the allowable jacking force range, which greatly reduces the adverse effects on the tunnel quality and construction period, reduces the investment cost, and ensures the construction efficiency.

[0006] As the preferred technical means: the internal relay room includes a triangle plate, a hydraulic jack, a hydraulic pump, a clamp and a back plate; the triangle plate is fixed on the back plate and the embedded steel ring; the hydraulic jack is arranged between the back plates on both sides; the hydraulic pump is placed inside the pipe joint; the clamp is fixed on the triangle plate. The rapid installation of the relay room can be effectively realized. When the pipe joint is locked, the triangle plate and the back plate only need to be welded to each other and then welded to the embedded steel ring, and the hydraulic jack, clamp and hydraulic pump are installed to conveniently and quickly perform the pipe joint escape operation.

[0007] As the preferred technical means: there are 72 triangle plates in total; there are 24 hydraulic jacks in total, which are fixed between the triangle plates on both sides through clamps, and 8 hydraulic jacks are set for each back plate on average; the hydraulic pump is connected to the hydraulic jack to achieve synchronous control; there are 48 clamps in total, and 2 clamps are set for each hydraulic jack on average; there are 3 back plates in total. The 24 hydraulic jacks controlled synchronously push into the front tunnel section, with high jacking force balance and good stability.

[0008] As a preferred technical means: the prefabricated relay spacer for a jacking tunnel is characterized in that the embedded steel ring includes a socket embedded steel ring, a spigot embedded steel ring, and anchor bars. The socket embedded steel ring is fixed to the socket of the previous jacking pipe section; the spigot embedded steel ring is fixed to the spigot of the next jacking pipe section; there are 768 anchor bars in total, of which 384 are evenly distributed on the outside of the socket embedded steel ring, and the other 384 are evenly distributed on the outside of the spigot embedded steel ring. During the production process of the pipe section, the steel ring is pre-embedded and anchored on the steel cage of the pipe section in advance, and steam curing is performed after integral casting with C50 concrete to improve the integrity of the prefabricated relay spacer. The structure firmly fixes the socket embedded steel ring and the spigot embedded steel ring on the pipe section through 768 anchor bars, and while fully transmitting the force to the pipe section, it ensures that the embedded steel ring will not be separated from the pipe section due to excessive force.

[0009] As the preferred technical means: the fixed connections between the triangle plate and the embedded steel ring, between the hoop and the triangle plate, and between the back plate and the triangle plate are all welded by gas shielded welding, the welding quality level is level 2, the weld is smooth and has no cracks, and the stress is eliminated in time after welding; under the extension and jacking of the hydraulic pump, the forward distance of the front jacking pipe section is 50mm each time. Since the triangle plate is subjected to a large jacking force during jacking, in order to meet its welding strength requirements, gas shielded welding is used for strong connection during welding. The welding quality level is level 2, and the weld is guaranteed to be smooth and has no cracks. Stress elimination is required after welding. This method is to release the stress generated during the welding operation to avoid dangerous situations such as fractures at the weld due to excessive stress in the later stage.

[0010] As a preferred technical means: the prefabricated intermediate pipe of the jacking tunnel is characterized in that the embedded steel ring is connected and fixed to the jacking pipe section by anchor bars in a straight anchoring manner; the fixed connection between the anchor bars and the embedded steel ring adopts gas shielded plug hole welding, the welding quality grade is level 2, the weld is flat and smooth without cracks, and the stress is eliminated in time after welding. It can effectively ensure the structural strength and the firmness of the welding, and the stress is eliminated after welding, which can release the stress generated during the welding operation and avoid the occurrence of dangerous situations such as fracture of the welding part due to excessive stress in the later stage.

[0011] Beneficial effects: The relay room can be installed conveniently and quickly. When the pipe joint is stuck, the relay room can be installed by welding, and the relay room jack can be used to assist the jacking of the pipe, which can help the stuck pipe joint to get out of trouble in time without having to pre-place the relay room pipe or temporarily drill holes and plant reinforcement to install the relay room, thus reducing investment costs. While greatly reducing the adverse effects of pipe joint locking on the jacking period, it ensures the overall waterproof performance and structural strength of the jacking tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a side structural cross-sectional view of the present invention.

[0013] Figure 2 It is a schematic diagram of the main structure of the present invention after removing the hydraulic pump, anchor bars, interface steel sleeve rings and main bars.

[0014] Figure 3 The present invention Figure 2 Schematic diagram of the structure of unit A.

[0015] Figure 4 The present invention Figure 2 Schematic diagram of the inner surface of unit A and part of the embedded steel ring after the hydraulic jack is removed.

[0016] In the figure: 1. Pipe joint; 2. Internal relay room; 3. Embedded steel ring; 4. Interface steel sleeve ring; 5. Socket steel ring; 6. Plug steel ring; 101. Longitudinal main reinforcement; 102. Transverse main reinforcement; 103. Concrete body; 104. Plywood; 201. Triangle plate; 202. Hydraulic jack; 203. Hydraulic pump; 204. Hoop; 205. Back plate; 301. Socket embedded steel ring; 302. Plug embedded steel ring; 303. Anchor reinforcement. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1-4 As shown, a prefabricated relay space for a jacking tunnel comprises a jacking pipe section 1 and an inner relay space 2. The jacking pipe section 1 is provided with an embedded steel ring 3, an interface steel sleeve ring 4, a socket steel ring 5, and a spigot steel ring 6; the inner relay space 2 is located on the embedded steel ring 3, and the inner relay space is a hydraulic jacking structure; the embedded steel ring 3 is located at the inner side of the socket and spigot between the front and rear jacking pipe sections 1; the interface steel sleeve ring 4 is located at the outer side of the spigot of the jacking pipe section 1; the socket steel ring 5 is located at the inner side of the spigot of the jacking pipe section 1; and the spigot steel ring 6 is located at the inner side of the spigot of the jacking pipe section 1. The jacking pipe section 1 comprises a longitudinal main reinforcement 101, a transverse main reinforcement 102, a concrete body 103, and a plywood 104; there are 100 longitudinal main reinforcements 101 per jacking pipe section 1; there are 44 transverse main reinforcements 102 per jacking pipe section 1; and the plywood 104 is located between two adjacent jacking pipe sections 1. During normal jacking, the prefabricated relay pipe is pushed into the tunnel by the main jack and used as an ordinary pipe segment. When the pipe segment is locked, the triangular plate 201 and the rear support plate 205 can be quickly welded to each other and then welded to the embedded steel ring 3 of the prefabricated relay pipe, and then the fixed hydraulic jack 202 is installed between the rear support plates 205 to implement segmented jacking of the jacking tunnel, which can quickly and conveniently help the pipe segment to get out of trouble and ensure that the jacking force on each tunnel pipe segment is within the allowable jacking force range.

[0019] The inner relay room 2 includes a triangular plate 201, a hydraulic jack 202, a hydraulic pump 203, a clamp 204 and a back plate 205; the triangular plate 201 is fixed on the back plate 205 and the embedded steel ring 3; the hydraulic jack 202 is arranged between the back plates 205 on both sides; the hydraulic pump 203 is placed inside the jacking pipe section 1; the clamp 204 is fixed on the triangular plate 201; the back plate 205 is fixed on the triangular plate 201 and the embedded steel ring 3. When the pipe section is locked, it is only necessary to weld the triangular plate 201 to the embedded steel ring 3 and install the hydraulic jack 202, the clamp 204 and the hydraulic pump 203 to quickly complete the installation of the relay room, and conveniently and quickly carry out the pipe section rescue operation. There are 72 triangular plates in total; there are 24 hydraulic jacks in total, which are fixed between the rear plates 205 on both sides by clamps 204, and an average of 8 hydraulic jacks 202 are set on each rear plate; the hydraulic pump 203 is connected to the hydraulic jack 202 to achieve synchronous control, and the 24 synchronously controlled hydraulic jacks 202 are pushed into the front tunnel section with high balanced jacking force and good stability. The forward distance of the front jacking pipe section 1 each time is 50 mm; there are 48 clamps 204 in total, and an average of two clamps 204 are set on each hydraulic jack 202; there are 3 rear plates 205 in total.

[0020] The embedded steel ring 3 includes a socket embedded steel ring 301, a spigot embedded steel ring 302, and anchor bars 303. The socket embedded steel ring 301 is fixed to the socket of the previous jacking pipe section 1; the spigot embedded steel ring 302 is fixed to the spigot of the next jacking pipe section 1; there are 768 anchor bars 303 in total, 384 anchor bars 303 are evenly arranged around the outer side of the socket embedded steel ring 301, and 384 anchor bars 303 are evenly arranged around the outer side of the spigot embedded steel ring 302. The embedded steel ring 3 is connected and fixed to the jacking pipe section 1 in a straight anchoring manner through the evenly distributed anchor bars 303; the anchor bars 303 and the embedded steel ring 3 are fixedly connected by gas shielded plug hole welding, the welding quality grade is level 2, the weld is flat and smooth without cracks, and the stress is eliminated in time after welding. The embedded steel ring 3 is connected and fixed to the top pipe segment 1 by anchor bars 303 in a straight anchoring manner; the anchor bars 303 and the embedded steel ring 3 are fixedly connected by gas shielded plug hole welding, the welding quality grade is level 2, the weld is flat and smooth without cracks, and the stress is eliminated in time after welding. It can effectively ensure the structural strength and the firmness of welding. The stress is eliminated after welding, which can release the stress generated during the welding operation and avoid the dangerous situation such as the weld fracture due to excessive stress in the later stage. During the production process of the manufacturer's pipe segment, the steel ring is pre-embedded and anchored on the pipe segment steel cage in advance, and steam curing is carried out after integral casting with C50 concrete to improve the integrity of the prefabricated relay pipe. The structure firmly fixes the socket embedded steel ring 301 and the socket embedded steel ring 302 on the top pipe segment 1 through 864 anchor bars 303, and while fully transmitting the force to the top pipe segment 1, it ensures that the embedded steel ring 3 will not be separated from the top pipe segment 1 due to excessive force. The fixed connection method between the triangle plate 201 and the embedded steel ring 3, the clamp 204 and the triangle plate 201, and the back plate 205 and the triangle plate 201 are all gas-shielded welding. The welding quality level is level 2. The weld is flat, smooth and free of cracks. The stress is eliminated in time after welding. Since the triangle plate 201 is subjected to a large jacking force during jacking, in order to meet its welding strength requirements, gas-shielded welding is used for strong connection during welding. The welding quality level is level 2, and the weld is guaranteed to be flat, smooth and free of cracks. The stress needs to be eliminated after welding. This method is to release the stress generated during the welding operation to avoid dangerous situations such as fractures at the weld due to excessive stress in the later stage.

[0021] When the pipe segment 1 of the jacking pipe is stuck, the internal relay room 2 is installed by welding, and the hydraulic jack 202 can be used to assist the jacking pipe quickly, helping the stuck pipe segment to get out of trouble in time without having to pre-place the relay room pipe or temporarily drill holes and plant reinforcement to install the relay room, thereby reducing the investment cost and greatly reducing the adverse effects of the pipe segment locking on the jacking period, while ensuring the overall waterproof performance and structural strength of the jacking tunnel.

[0022] above Figure 1-4The prefabricated relay room for a jacking pipe section shown is a specific embodiment of the present invention, which has embodied the outstanding substantial features and remarkable progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc. can be made to it, which are all within the protection scope of this scheme.

Claims

1. A prefabricated intermediate pipe for a pipe jacking tunnel, characterized in that: It comprises a jacking pipe section (1) and an internal relay room (2). The jacking pipe section (1) is provided with a pre-buried steel ring (3), an interface steel sleeve ring (4), a socket steel ring (5) and a spigot steel ring (6); the internal relay room (2) is located on the pre-buried steel ring (3), and the internal relay room is a hydraulic jacking structure; the pre-buried steel ring (3) is located on the inner side of the socket and spigot between the front and rear jacking pipe sections (1); the interface steel sleeve ring (4) is located on the outer side of the socket of the jacking pipe section (1); the socket steel ring (5) is located on the inner side of the socket of the jacking pipe section (1); and the spigot steel ring (6) is located on the inner side of the spigot of the jacking pipe section (1).

2. The prefabricated intermediate pipe for a jacking tunnel according to claim 1, characterized in that: The jacking pipe section (1) comprises longitudinal main reinforcement (101), transverse main reinforcement (102), a concrete body (103) and a plywood (104); the longitudinal main reinforcement (101) comprises 100 pieces per jacking pipe section (1); the transverse main reinforcement (102) comprises 44 pieces per jacking pipe section (1); and the plywood (104) is located between two adjacent jacking pipe sections (1).

3. The prefabricated intermediate pipe for a jacking tunnel according to claim 2, characterized in that: The inner relay room (2) comprises a triangular plate (201), a hydraulic jack (202), a hydraulic pump (203), a clamp (204) and a back plate (205); the triangular plate (201) is fixed on the back plate (205) and the embedded steel ring (3); the hydraulic jack (202) is arranged between the back plates (205) on both sides; the hydraulic pump (203) is placed inside the jacking pipe section (1); and the clamp (204) is fixed on the triangular plate (201).

4. The prefabricated intermediate pipe for a jacking tunnel according to claim 3, characterized in that: There are 72 triangle plates (201) in total; there are 24 hydraulic jacks (202) in total, which are fixedly arranged between the triangle plates (201) on both sides through hoops (204), and on average, 8 hydraulic jacks (202) are arranged on each back plate (205); the hydraulic pump (203) is connected to the hydraulic jacks (202) to achieve synchronous control; there are 48 hoops (204) in total, and on average, 2 hoops (204) are arranged on each hydraulic jack (202); there are 3 back plates (205) in total.

5. The prefabricated intermediate pipe for a jacking tunnel according to claim 4, characterized in that: The embedded steel ring (3) comprises a socket embedded steel ring (301), a spigot embedded steel ring (302) and anchor bars (303); the socket embedded steel ring (301) is arranged to be fixed to the socket of the previous jacking pipe section (1); the spigot embedded steel ring (302) is arranged to be fixed to the spigot of the next jacking pipe section (1); and there are 768 anchor bars (303) in total, of which 384 are evenly distributed on the outside of the socket embedded steel ring (301), and the other 384 are evenly distributed on the outside of the spigot embedded steel ring (302).

6. The prefabricated intermediate pipe for a jacking tunnel according to claim 4, characterized in that: The fixed connections between the triangle plate (201) and the embedded steel ring (3), between the hoop (204) and the triangle plate (201), and between the back plate (205) and the triangle plate (201) are all made by gas shielded welding, the welding quality grade is level 2, the weld is smooth and has no cracks, and the stress is eliminated in time after welding; under the extension and jacking of the hydraulic pump (203), the forward distance of the front jacking pipe section (1) is 50 mm each time the jacking is moved.

7. The prefabricated intermediate pipe for a jacking tunnel according to claim 5, characterized in that: The embedded steel ring (3) is fixed to the top pipe section (1) in a straight anchoring manner by means of anchor bars (303) evenly distributed around it; the fixed connection between the anchor bars (303) and the embedded steel ring (3) is achieved by gas shielded plug hole welding, the welding quality grade is level 2, the weld is flat and smooth without cracks, and stress is promptly eliminated after welding.

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