Construction method for jacking pipe to adjacently pass through existing bridge

Abstract

The invention relates to a construction method for a jacking pipe to adjacently pass through an existing bridge, which comprises the following steps of: 1, reinforcing building isolation piles: building two rows of isolation piles which are distributed in a direction perpendicular to the extension direction of the jacking pipe on the periphery of an area through which the jacking pipe passes, and positioning the two rows of isolation piles between two rows of piers adjacent to the same jacking pipe, the upper ends of each row of isolation piles are connected together through a top beam, and the top beams on the two rows of isolation piles are connected together through a plurality of cross beams; secondly, reinforcing piles are built; thirdly, building reinforcing beams are reinforced, specifically, the reinforcing beams of a reinforced concrete structure are poured to pour the reinforcing piles and the piers where the reinforcing piles are located together; and 4, building a jacking pipe: jacking the pipe jacking machine and the jacking pipe into an area through which the jacking pipe penetrates through the jacking pipe starting well until the jacking pipe penetrates through the jacking pipe receiving well. The jacking pipe has the advantage that the displacement of the pier can be avoided, and the problem that the displacement of the pier is caused when the existing jacking pipe adjacently passes through the existing bridge is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction method for a jacking pipe to pass adjacently through an existing bridge. Background Art

[0002] In engineering construction, it is necessary to construct underground passages (including pipelines). The existing passage construction methods include: shield construction, blasting construction, open excavation construction and pipe jacking construction. Pipe jacking construction is a trenchless construction method, which is a pipeline burial or passage construction technology without excavation or with less excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the working pit to overcome the friction between the pipeline and the surrounding soil, push the pipeline into the soil according to the designed slope, and transport the soil away. After one section of the pipe is pushed into the soil layer, the second section of the pipe is pushed in. The principle is to use the thrust of the main jacking cylinder and the pipeline room, relay room, etc. to push the pipe section or tunneling machine (pipe jacking machine) from the starting well through the soil layer to the receiving well for lifting. The pipeline follows the pipe jacking machine and is buried between the two pits. During the pipe jacking construction process, there will be a situation where the pipe jacking crosses an existing bridge. At this time, the pipe jacking construction will interfere with the adjacent bridge piers, causing the bridge piers to tilt and sink, etc., which will affect the safety of the bridge. The existing method to reduce the interference with the bridge piers is to keep the pipe jacking away from the bridge piers as much as possible. Although this construction method ensures less interference with the bridge piers, it also results in the pipe jacking line not being able to be laid along the optimal route. Summary of the invention

[0003] The present invention aims to provide a construction method for pipe jacking adjacent to and crossing an existing bridge which can avoid displacement of bridge piers, thereby solving the problem that the existing pipe jacking adjacent to and crossing an existing bridge may cause displacement of bridge piers.

[0004] The above technical problems are solved by the following technical solutions: A construction method for pipe jacking adjacent to an existing bridge, characterized in that: the first step is to build isolation piles for reinforcement: two rows of isolation piles distributed perpendicular to the extension direction of the pipe jacking are built on the periphery of the area where the pipe jacking passes, the two rows of isolation piles are located between two rows of piers adjacent to the pipe jacking, the upper ends of each row of isolation piles are connected together by a crown beam, and the crown beams on the two rows of isolation piles are connected together by a plurality of cross beams; the second step is to build reinforcement piles: a row of reinforcement piles is built on each of the two rows of piers adjacent to the pipe jacking, and the reinforcement piles are arranged at intervals with the piers where the reinforcement piles are located; the third step is to build reinforcement beams for reinforcement: a reinforcement beam with a reinforced concrete structure is cast together with the reinforcement piles and the piers where the reinforcement piles are located; the fourth step is to build pipe jacking: a pipe jacking starting well is built at one end of the area where the pipe jacking passes, and a pipe jacking receiving well is built at the other end, and a pipe jacking machine and a pipe jacking are pushed into the area where the pipe jacking passes through the pipe jacking starting well until the pipe jacking passes through the pipe jacking receiving well. The construction method can ensure that when the jacking pipe passes adjacent to an existing bridge, the piers of the bridge will not be displaced.

[0005] Preferably, the bridge pier connected to the reinforcement beam is provided with a plurality of connection holes, in which steel connectors are inserted, and the steel connectors are fixed to the steel bar skeleton of the reinforcement beam, and the steel connectors are fixed to the connection holes, so as to improve the connection reliability between the cast reinforcement beam and the bridge pier.

[0006] Preferably, the steel connecting head comprises a steel casing and a steel inner rod inserted in the steel casing. After the connecting hole is drilled, the steel casing is first inserted into the connecting hole. The connecting hole and the steel casing are both linear structures. A connecting gap surrounding the outer periphery of the steel casing is provided between the steel casing and the hole wall of the connecting hole. A supporting foot is provided at the inner end of the steel casing. A connecting hole is formed between adjacent supporting feet and the bottom wall of the connecting hole. After the steel casing is inserted into the connecting hole, it is maintained parallel to the extension direction of the connecting hole. The steel casing is fixed together with the steel bar skeleton of the reinforcement beam for fixed positioning. Air is blown into the connecting hole from the outer end of the steel casing. The wind entering the steel casing is reflected by the bottom wall of the connecting hole in a parallel direction. The direction of the steel casing flows out of the connection hole from the connecting gap, so that the dust in the connection hole is blown out until the cleanliness of the connection hole meets the requirements, and cement mortar is injected from the outer end of the steel casing into the connection hole until the cement mortar flows out from the connecting gap, and the steel inner rod is inserted into the steel casing to pressurize the cement mortar in the connection hole, and the steel inner rod is fixed together with the steel skeleton of the reinforced beam, and then concrete is poured on the steel skeleton of the reinforced beam. After the concrete solidifies, it forms the reinforced beam together with the steel skeleton of the reinforced beam, and the cement slurry in the connection hole is poured together with the reinforced beam. The cement slurry in the connection hole is solidified to form a concrete connector of the connection hole. It can easily start to achieve the cleaning and protection requirements of the connection hole. It can ensure that the steel connector is reliably bonded to the connection hole.

[0007] Preferably, a positioning ring groove extending along the circumference of the connecting hole is provided on the bottom wall of the connecting hole, and the supporting foot is supported in the positioning ring groove, so that the steel casing can be accurately positioned when inserted into the connecting hole in a distributed and rapid manner.

[0008] Preferably, a connection ring groove is provided on the peripheral surface of the bridge pier connected to the reinforcement beam. Before casting the reinforcement beam, the connection ring groove and the part where the bridge pier and the reinforcement beam are connected are cleaned to a required cleanliness level. When casting the reinforcement beam, concrete flows into the connection ring groove and solidifies to form a concrete connection ring. This can improve the connection reliability between the reinforcement beam and the surface of the bridge pier.

[0009] Preferably, the bottom of the connecting ring groove faces upward and the opening faces downward, so that the connecting ring groove can be cleaned conveniently and quickly.

[0010] Preferably, after the connection ring groove and the connection part of the bridge pier and the reinforcement beam are cleaned to the required cleanliness, a wire filter is wrapped on the connection part of the bridge pier and the reinforcement beam, and the slurry in the concrete during the casting of the reinforcement beam penetrates through the wire filter and reaches the connection ring groove to solidify to form the annular concrete connection ring and reaches the connection part of the bridge pier and the reinforcement beam to form a concrete bonding layer. This can improve the connection reliability, ensure the compactness of the reversing concrete connection ring, and avoid the generation of gaps that affect the connection reliability.

[0011] Preferably, the steel connectors are arranged in two rows in the vertical direction, the steel connectors in the same row are distributed along the circumference of the bridge pier connected to the reinforcement beam, and the upper and lower adjacent steel connectors are staggered in the vertical direction and connected together by steel bars, which can improve the connection reliability.

[0012] Preferably, the isolation pile is provided with a reinforced concrete protrusion, and the reinforced concrete protrusion is cast together with the reinforcement beam, so as to further improve the ability to resist sinking.

[0013] Preferably, there are two jacking pipes, a row of bridge piers is arranged between the two jacking pipes, and both ends of the cap beams on the two rows of isolation piles between the two jacking pipes extend out of the bridge and are connected together through a concrete reinforcement platform. This can more reliably prevent the piers between the jacking pipes from shifting. When jacking pipes pass through the two sides of the piers, the piers can also be reliably kept from shifting.

[0014] The present invention has the following advantages: when the jacking pipe passes adjacent to an existing bridge, the bridge pier can be kept from shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view schematic diagram during the pipe jacking construction process; Figure 2 for Figure 1 A partial enlarged schematic diagram of Figure 3 It is an enlarged schematic diagram of the cross-section of the connection between the bridge pier and the reinforcement beam; Figure 4 for Figure 3 A local enlarged schematic diagram of point B; Figure 5 It is a vertical cross-sectional schematic diagram of the connection between the bridge pier and the reinforcement beam; Figure 6 for Figure 5 A local enlarged schematic diagram of point C.

[0016] In the figure: bridge pier 1, bridge deck 2, isolation pile reinforcement 3, area through which jacking pipe passes 4, crown beam 5, isolation piles 6, cross beam 7, jacking pipe starting well 8, jacking pipe receiving well 9, concrete reinforcement platform 10, reinforcement piles 11, reinforcement beam 13, steel connector 14, steel casing 15, steel inner rod 16, support foot 17, bottom wall of connecting hole 18, concrete connector of connecting hole 19, positioning ring groove 12, connecting ring groove 20, concrete connecting ring 21, wire filter 22. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figures 1 to 6 The invention discloses a construction method for pipe jacking adjacent to and crossing an existing bridge, wherein the bridge comprises a bridge deck 2 supported by a row of bridge piers 1. The bridge deck is an isolated two-way traffic bridge deck. The first step is to build isolation piles: build two rows of isolation piles 6 distributed perpendicular to the extension direction of the jacking pipe at the periphery of the area 4 through which the jacking pipe passes, the two rows of isolation piles are located between two rows of piers adjacent to the jacking pipe, the upper ends of each row of isolation piles are connected together by a crown beam 5, and the crown beams on the two rows of isolation piles are connected together by a number of cross beams 7; the second step is to build reinforcement piles 11: build a row of reinforcement piles on each of the two rows of piers adjacent to the jacking pipe, and the reinforcement piles are arranged at intervals with the piers where the reinforcement piles are located; the third step is to build reinforcement beams 13 for reinforcement: cast reinforcement beams of reinforced concrete structure to cast the reinforcement piles and the piers where the reinforcement piles are located together; the fourth step is to build jacking pipes: build a jacking pipe starting well 8 at one end of the area through which the jacking pipe passes, and build a jacking pipe receiving well 9 at the other end, and push the jacking machine and the jacking pipe through the jacking pipe starting well into the area through which the jacking pipe passes until the jacking pipe penetrates into the jacking pipe receiving well.

[0019] A plurality of connection holes are arranged on the bridge pier connected with the reinforcement beam, and a steel connection head 14 is passed through the connection hole. The steel connection head is fixed to the reinforcement frame of the reinforcement beam, and the steel connection head is fixed to the connection hole. Specifically, the steel connection head includes a steel casing 15 and a steel inner rod 16 passed through the steel casing. After the connection hole is drilled, the steel casing is first passed through the connection hole. Both the connection hole and the steel casing are linear structures. A connecting gap surrounding the outer periphery of the steel casing is arranged between the steel casing and the hole wall of the connection hole. A supporting foot 17 is arranged at the inner end of the steel casing. A connecting hole is formed between adjacent supporting feet and the bottom wall of the connection hole. The cross section of the bottom wall 18 of the connection hole is in the shape of a "w". After the steel casing is inserted into the connection hole, it is maintained parallel to the extension direction of the connection hole. The steel casing is fixed to the reinforcement frame of the reinforcement beam. The steel casing is fixed and positioned together, and air is blown from the outer end of the steel casing into the connection hole. The air entering the steel casing is reflected by the bottom wall of the connection hole and flows out of the connection hole from the connecting gap in a direction parallel to the steel casing, thereby blowing out the dust in the connection hole until the cleanliness of the connection hole meets the requirements. Then cement mortar is injected from the outer end of the steel casing into the connection hole until the cement mortar flows out of the connecting gap. The steel inner rod is inserted into the steel casing to pressurize the cement mortar in the connection hole, and the steel inner rod is fixed together with the steel frame of the reinforced beam. Then concrete is poured on the steel frame of the reinforced beam. After the concrete solidifies, it forms the reinforced beam together with the steel frame of the reinforced beam. The cement slurry in the connection hole is together with the reinforced beam. The cement slurry in the connection hole solidifies to form a concrete connector 19 of the connection hole. A positioning ring groove 12 extending along the circumference of the connection hole is provided on the bottom wall of the connection hole, and the support foot is supported in the positioning ring groove. A connecting ring groove 20 is provided on the peripheral surface of the pier connected to the reinforcement beam. Before casting the reinforcement beam, the connecting ring groove and the connecting portion of the pier connected to the reinforcement beam are cleaned to the required cleanliness. When casting the reinforcement beam, concrete flows into the connecting ring groove and solidifies to form a concrete connecting ring 21. Specifically: the bottom of the connecting ring groove is located at the top with the opening facing downward. After the connecting ring groove and the connecting portion of the pier connected to the reinforcement beam are cleaned to the required cleanliness, a wire filter 22 is wrapped on the connecting portion of the pier connected to the reinforcement beam and the reinforcement beam. When casting the reinforcement beam, the slurry in the concrete penetrates through the wire filter and reaches the connecting ring groove to solidify to form an annular concrete connecting ring and reaches the connecting portion of the pier connected to the reinforcement beam to form a concrete bonding layer. There are two rows of steel connectors in the vertical direction. The steel connectors in the same row are distributed along the circumference of the bridge piers connected with the reinforcement beams. The upper and lower adjacent steel connectors are staggered in the vertical direction and welded together by steel bars. The reinforcement beam is cast on the upper end surface of the reinforcement pile.

[0020] There are two jacking pipes, and a row of bridge piers is arranged between the two jacking pipes. Both ends of the cap beam on the two rows of isolation piles between the two jacking pipes extend out of the bridge and are connected together through a concrete reinforcement platform 10 .

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for pipe jacking adjacent to and crossing an existing bridge, characterized in that: The first step is to build isolation piles for reinforcement: build two rows of isolation piles perpendicular to the extension direction of the jacking pipe at the periphery of the area where the jacking pipe passes, the two rows of isolation piles are located between two rows of piers adjacent to the jacking pipe, the upper ends of each row of isolation piles are connected together by a crown beam, and the crown beams on the two rows of isolation piles are connected together by a number of cross beams; the second step is to build reinforcement piles: build a row of reinforcement piles on each of the two rows of piers adjacent to the jacking pipe, and the reinforcement piles are arranged at intervals with the piers where the reinforcement piles are located; the third step is to build reinforcement beams: cast reinforced concrete structure reinforcement beams to cast the reinforcement piles and the piers where the reinforcement piles are located together; the fourth step is to build jacking pipes: build a jacking pipe starting well at one end of the area where the jacking pipe passes and a jacking pipe receiving well at the other end, and push the jacking machine and the jacking pipe through the jacking pipe starting well into the area where the jacking pipe passes until the jacking pipe penetrates into the jacking pipe receiving well.

2. A construction method for pipe jacking adjacent to an existing bridge according to claim 1, characterized in that: The bridge pier connected to the reinforcement beam is provided with a plurality of connection holes, steel connection heads are passed through the connection holes, the steel connection heads are fixed to the steel bar skeleton of the reinforcement beam, and the steel connection heads are fixed to the connection holes.

3. A construction method for pipe jacking adjacent to an existing bridge according to claim 2, characterized in that: The steel connecting head includes a steel casing and a steel inner rod inserted in the steel casing. After the connecting hole is drilled, the steel casing is first inserted into the connecting hole. The connecting hole and the steel casing are both linear structures. A connecting gap surrounding the outer periphery of the steel casing is provided between the steel casing and the hole wall of the connecting hole. A supporting foot is provided at the inner end of the steel casing. A connecting hole is formed between adjacent supporting feet and the bottom wall of the connecting hole. After the steel casing is inserted into the connecting hole, it is maintained parallel to the extension direction of the connecting hole. The steel casing is fixed together with the steel bar skeleton of the reinforcement beam for fixed positioning. Air is blown into the connecting hole from the outer end of the steel casing. The wind entering the steel casing is reflected by the bottom wall of the connecting hole in a direction parallel to the steel casing. The direction of the pipe flows out of the connecting hole from the connecting gap, thereby blowing the dust in the connecting hole out until the cleanliness of the connecting hole meets the requirements, and cement mortar is injected into the connecting hole from the outer end of the steel casing until the cement mortar flows out from the connecting gap, and the steel inner rod is inserted into the steel casing to pressurize the cement mortar in the connecting hole, and the steel inner rod is fixed together with the steel frame of the reinforced beam, and then concrete is poured on the steel frame of the reinforced beam. After the concrete solidifies, it forms the reinforced beam together with the steel frame of the reinforced beam, and the cement slurry in the connecting hole is poured together with the reinforced beam. The cement slurry in the connecting hole is solidified to form a concrete connector of the connecting hole.

4. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 3, characterized in that: A positioning ring groove extending along the circumference of the connecting hole is provided on the bottom wall of the connecting hole, and the supporting foot is supported in the positioning ring groove.

5. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 1, 2, 3 or 4, characterized in that: A connecting ring groove is provided on the peripheral surface of the bridge pier connected to the reinforcement beam. Before casting the reinforcement beam, the connecting ring groove and the connection portion between the bridge pier and the reinforcement beam are cleaned to the required cleanliness. When casting the reinforcement beam, concrete flows into the connecting ring groove and solidifies to form a concrete connecting ring.

6. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 5, characterized in that: The groove bottom of the connecting ring groove faces upwards and the opening faces downwards.

7. The construction method of pipe jacking adjacent to an existing bridge according to claim 5, characterized in that: After the connecting ring groove and the connecting portion of the pier and the reinforced beam are cleaned to the required cleanliness, a wire filter is wrapped on the connecting portion of the pier and the reinforced beam. When the reinforced beam is cast, the slurry in the concrete penetrates through the wire filter and reaches the connecting ring groove to solidify to form the annular concrete connecting ring and reaches the connecting portion of the pier and the reinforced beam to form a concrete bonding layer.

8. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 2, 3 or 4, characterized in that: The steel connectors are arranged in two rows along the up-down direction. The steel connectors in the same row are distributed along the circumference of the bridge piers connected to the reinforcement beams. The upper and lower adjacent steel connectors are staggered along the up-down direction and connected together by steel bars.

9. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 1, 2, 3 or 4, characterized in that: The isolation pile is provided with a reinforced concrete protrusion, and the reinforced concrete protrusion is cast together with the reinforcement beam.

10. A construction method for pipe jacking adjacent to and crossing an existing bridge according to claim 1, 2, 3 or 4, characterized in that: There are two jacking pipes, a row of bridge piers is arranged between the two jacking pipes, and both ends of the cap beam on the two rows of isolation piles between the two jacking pipes extend out of the bridge and are connected together through a concrete reinforcement platform.

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