Temporary support construction method for laterally holed rectangular jacking pipe

Abstract

The invention discloses a lateral holing rectangular pipe jacking temporary support construction method which comprises the following steps: firstly prefabricating pipe joints in a corresponding processing factory, processing main parts of an underground structure, such as a section steel beam and a connecting piece, then transporting the main parts to a construction site, and carrying out normal pipe jacking construction after preparation work on the construction site is finished. A first pipe joint is installed in the side face holing area, at least two second pipe joints are installed on each side adjacent to the holing area, and conventional pipe joints are installed on the outer sides of the second pipe joints; and finally, section steel beams are installed above and below the holed areas of the inner walls of the first pipe joint and the second pipe joint, the horizontal end faces of the section steel beams and the vertical end faces of the section steel beams abut against the inner walls of the pipe joints, the horizontal ends and the vertical ends are fixedly connected with the corresponding connecting pieces, and temporary supporting structure construction is completed. The section steel beam is easy and convenient to install, the construction cost of temporary supporting is saved, the construction period is shortened, the working efficiency is improved, and meanwhile the construction safety and the overall stability of an underground structure are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of rectangular jacking pipe construction, and in particular relates to a temporary support construction method for a rectangular jacking pipe with a lateral opening. Background Art

[0002] During the construction of the jacking pipe, the rectangular jacking pipe is generally an integral reinforced concrete structure, but in order to meet the construction of specific projects such as bypass channels or communication channels, it is sometimes necessary to open a hole on the side of the jacking pipe segment. The lateral opening of the jacking pipe requires cutting and chiseling of the reinforced concrete of the rectangular jacking pipe with the lateral opening, which will inevitably weaken the bearing capacity of the original structure. Therefore, before the underground structure is opened, in order to ensure the safety of construction, measures must be taken to support and stabilize the surrounding soil. As an effective support measure, the temporary support structure can prevent soil collapse and provide a safe working environment for construction personnel. Its role and significance lie in ensuring construction safety, protecting the surrounding environment, improving construction efficiency, adapting to complex geological conditions and meeting regulatory requirements. The temporary support forms used before the existing underground structure is opened are mainly steel beams, steel columns, diagonal braces, etc. as temporary support structures. This approach can support and protect the underground structure to a certain extent, but its construction is time-consuming and inefficient, and has high requirements for installation accuracy and welding quality. There are defects such as incomplete welding, slag inclusions, and cracks, which affect the connection strength and overall stability. Summary of the invention

[0003] In view of the technical defects of the temporary support used before the existing underground structure drilling mentioned in the background technology, the present invention provides a temporary support construction method for a lateral hole rectangular jacking pipe, which is easy to install, saves costs, reduces construction period, improves work efficiency, and ensures the safety of underground structure construction and the overall stability of underground construction.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is: A temporary support construction method for a rectangular jacking pipe with a lateral opening, comprising the following construction steps: S1. Prefabricated pipe sections, processed steel beams and connectors: Prefabricated pipe sections, processed steel beams and connectors are respectively prepared in corresponding factories according to the design dimensions; wherein the prefabricated pipe sections include the first pipe section that needs to be opened with holes, the second pipe section that does not need to be opened with holes and the conventional pipe section that does not need to be opened with holes of the same external dimensions; during the pipe section prefabrication process, it is ensured that connectors are pre-embedded on the inner walls of the first pipe section and the second pipe section, and the two pipe sections are pre-embedded with upper and lower rows of connectors above and below the opening area; the processed steel beam has at least one horizontal end and one vertical end in terms of the cross-sectional direction; S2. Pipe jacking construction: After the construction site preparation work is completed, normal pipe jacking construction shall be carried out, and it shall be ensured that the first pipe section is installed in the side opening area of ​​the pipe body of the construction, at least two second pipe sections are installed on each side of the opening area, and conventional pipe sections are installed outside the second pipe sections; S3. Install the steel beam: install a steel beam on the inner wall of the first pipe section and above and below the opening area respectively, and ensure that both ends of the steel beam extend beyond the corresponding end of the opening area by at least two second pipe sections; at the same time, connect and fix the horizontal end and the vertical end to the corresponding connecting parts.

[0005] Furthermore, in the prefabricated pipe segments, processed steel beams and connectors in step S1, when the first pipe segment and the second top pipe segment are prefabricated, all connectors on the same pipe segment are arranged both symmetrically on the left and right and symmetrically on the top and bottom.

[0006] Furthermore, in the prefabricated pipe segments, processed steel beams and connecting parts of step S1, the connecting parts are connectors and connecting bolts. When prefabricating the first pipe segment and the second top pipe segment, only the connector is embedded in the pipe segment, and one end face of the connector connecting bolt is ensured to be flush with the inner wall of the pipe segment, and the other end face of the connector is fixedly connected to the main reinforcement in the pipe segment by welding tie bars.

[0007] Furthermore, in the prefabricated pipe segments, processed steel beams and connecting parts of step S1, when pre-embedded connectors are inside the first pipe segment and the second top pipe segment, it is ensured that there is a row of horizontally buried connectors and a row of vertically buried connectors above and below the pipe segments, and it is ensured that the horizontally buried connectors and the vertically buried connectors are not located on the same vertical plane, and the horizontally buried connectors are closer to the opening area on the pipe segment than the vertically buried connectors.

[0008] Furthermore, when processing the steel beam, corresponding waist-shaped holes are processed on the horizontal end and the vertical end of the steel beam according to the position of the embedded connector, and the waist-shaped holes are parallel to the wide side of the beam; when installing the steel beam, the horizontally arranged connector is fixedly connected to the vertical end by horizontal connecting bolts, and the vertically arranged connector is fixedly connected to the horizontal end by vertical connecting bolts.

[0009] Furthermore, in the prefabricated pipe section, processed steel beam and connecting parts of step S1, the connecting parts are steel plate components, which include embedded plates and studs. When processing the connecting parts, firstly, a standard-sized steel plate or a large piece of steel plate is punched and cut into small arc-shaped embedded plates corresponding to the inner curvature of the upper and lower ends of the top pipe, and then four rectangular studs (rectangles parallel to the four sides of the embedded plate) arranged at the four top corners are welded in the middle of the convex surface of the embedded plate, and the studs are welded at the small head end; when prefabricating the first pipe section and the second top pipe section, the steel plate component composed of the studs and the embedded plates is buried inwardly at the corresponding inner arc surfaces of the upper and lower ends of the first pipe section and the second top pipe section with the large head ends of the studs facing inward.

[0010] Furthermore, in the installation of the steel beam in step S3, the end faces of the horizontal end and the vertical end that are far away from each other are respectively abutted against the concave surfaces of the embedded plates of the upper and lower rows of steel plate components, and it is ensured that the four bolts on each embedded plate are spaced apart in pairs on both sides of the horizontal end or the vertical end, and then the horizontal end and the vertical end are welded and fixed to the embedded plate.

[0011] Furthermore, in the installation of the steel beam in step S3, when welding and fixing the steel beam and the embedded plate, the two ends of the steel beam are first preliminarily welded to the corresponding embedded plates by spot welding, and then all the embedded plates and the steel beam are welded and fixed one by one after the correct position of the steel beam is detected.

[0012] Furthermore, the number of the first pipe segments is determined according to the size of the hole area actually required and the length of the pipe segments.

[0013] Furthermore, the steel beam is an L-shaped structural beam with an L-shaped cross section or a box-shaped structural beam formed by welding ribs parallel to the horizontal end and the vertical end on the inner side of the L-shaped structural beam.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention embeds the connector into the first pipe section and the second pipe section in a prefabricated form in the factory, constructing a temporary reinforcement structure system with a steel beam as the main body and the embedded connector fixedly connected to the steel beam, so as to effectively cope with the working condition where the bearing capacity of the original structure decreases due to the opening operation of the pipe segment, and ensure the stability and safety of the overall structure. At the same time, the steel beam is easy to install, saves the construction cost of temporary support, shortens the construction period, and improves work efficiency.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a process flow chart of a construction method according to a first embodiment of the present invention.

[0017] Figure 2 A three-dimensional diagram of the temporary support of the rectangular jacking pipe with a side opening after the construction of the present invention is completed; Figure 3 This is a schematic diagram of the connection structure between the first pipe section and the connecting piece according to the second embodiment of the present invention; Figure 4 It is a three-dimensional solid perspective view of a temporary support for a rectangular jacking pipe with a side opening according to the second embodiment of the present invention; Figure 5 This is a schematic diagram of the connection structure between the first pipe section and the connecting piece according to the third embodiment of the present invention; Figure 6 It is a three-dimensional solid perspective view of temporary support for a rectangular jacking pipe with a lateral opening according to embodiment three of the present invention.

[0018] The numbers and corresponding names in the figure are: 1. First pipe section, 11. C-type pipe section, 12. Prefabricated block, 2. Second pipe section, 3. Conventional pipe section, 4. Opening area, 5. Steel beam, 51. Horizontal end, 52. Vertical end, 6. Connector, 61. Connector, 62. Connecting bolt, 63. Tie rod, 64. Gasket; 65. Embedded plate, 66. Bolt. DETAILED DESCRIPTION Example

[0019] A temporary support construction method for rectangular jacking pipe with side openings, such as Figure 1 , 2 As shown, the method includes the following construction steps: S1. Prefabricated pipe segments, processed steel beams and connectors: According to the design dimensions, the steel beams 5, connectors 6, and prefabricated jacking pipe segments and other main components of the underground structure are processed in the corresponding factories. Among them, the prefabricated jacking pipe segments include three rectangular pipe segments with the same inner and outer diameters, namely: the first pipe segment 1 that needs to be drilled, the second pipe segment 2 that does not need to be drilled, and the conventional pipe segment 3 that does not need to be drilled. The first pipe section 1 is the main pipe section of the opening area 4, and its main part is a C-shaped steel-concrete structure; when the first pipe section 1 is prefabricated, the C-shaped pipe section 11 and the prefabricated block 12 that matches the C-shaped opening of the pipe section are prefabricated first, and then the prefabricated block 12 is connected to the C-shaped pipe section 11 to block its C-shaped opening, so as to form an annular rectangular pipe section with the same external dimensions as the second pipe section 2 and the conventional pipe section 3; and, during the prefabrication of the first pipe section 1 and the second pipe section 2, it is also ensured that the inner walls of the first pipe section 1 and the second pipe section 2 are pre-embedded with connecting pieces 6, and the two pipe sections are pre-embedded with two rows of connecting pieces 6 arranged up and down above and below the opening area 4. When the steel beam 5 is processed, it is ensured that the steel beam 5 has at least one horizontal end 51 and one vertical end 52 in the cross-sectional direction, and its length must be greater than the length of the four pipe sections of the opening area 4 of the top pipe body. Preferably, the steel beam 5 is an L-shaped structural beam with an L-shaped cross-section or a box-shaped structural beam formed by welding ribs parallel to the horizontal end 51 and the vertical end 52 on the inner side of the L-shaped structural beam. When the first pipe section 1 and the second top pipe section are prefabricated, all the connectors 6 on the same pipe section must correspond to the corresponding connection points on the steel beam 5. Preferably, the connectors 6 on the same pipe section are arranged symmetrically on the pipe section.

[0020] S2. Pipe jacking construction: After the preparation work at the construction site (preparation work includes material delivery, water and electricity access, equipment delivery and installation, etc.) is completed, normal pipe jacking construction is carried out, and it is ensured that all the first pipe sections 1 are installed in the side opening area 4 of the pipe body of the construction. The number of first pipe sections 1 is determined according to the actual required length of the opening area 4 and the length of the pipe section. At least two second pipe sections 2 are installed on each side of the opening area 4, and conventional pipe sections 3 are installed outside the second pipe sections 2. In this way, it can be ensured that the opening area 4 is the C-shaped opening area of ​​the first pipe section 1, and the connected prefabricated blocks 12 can be removed later, which is convenient for the later opening construction of the pipe section.

[0021] S3. Install the steel beam: a steel beam 5 is buckled on the inner wall of the first pipe section 1 and located above and below the opening area 4, and both ends of the steel beam 5 are ensured to exceed the corresponding end of the opening area 4 by at least two second pipe sections 2, so as to prevent excessive deformation of the structure when the pipe section is opened, resulting in structural damage; at the same time, the end face of the horizontal end 51 of the steel beam 5 and the end face of the vertical end 52 of the steel beam 5 are abutted against the inner wall of the pipe section, and the end of the steel beam 5 close to the opening area 4 is the horizontal end 51 in a horizontal state, and then the horizontal end 51 and the vertical end 52 are connected and fixed to the corresponding connecting piece 6. Preferably, the two ends of the steel beam 5 are flush with the outer end faces of the two outermost second pipe sections 2 located at the opening area 4.

[0022] The present invention embeds the connector into the first pipe section and the second pipe section in a prefabricated form in the factory, constructing a temporary reinforcement structure system with a steel beam as the main body and the embedded connector fixedly connected to the steel beam, so as to effectively cope with the working condition where the bearing capacity of the original structure decreases due to the opening operation of the pipe segment, and ensure the stability and safety of the overall structure. At the same time, the steel beam is easy to install, saves the construction cost of temporary support, shortens the construction period, and improves work efficiency. Example

[0023] This embodiment generally adopts the solution of the first embodiment, in which the connector 6 adopts a connector 61 assembly. Figure 2-4 As shown, the connector 61 assembly is provided with a connector 61 and a connecting bolt 62. When the first pipe section 1 and the second top pipe section are prefabricated, only the connector 61 is pre-buried in the pipe section, and at the same time, one end face of the connecting bolt 62 of the connector 61 is ensured to be flush with the inner wall of the pipe section, and the other end face of the connector 61 is fixedly connected to the main reinforcement in the pipe section by welding the tie rod 63. The connector 61 is connected to the main reinforcement by the tie rod 63 to ensure the connection strength between the connector 61 and the first pipe segment. When the connector 61 is pre-buried, it is ensured that there is a row of horizontally buried connectors 61 and a row of vertically buried connectors 61 above and below the pipe section, and it is ensured that the horizontally buried connectors 61 and the vertically buried connectors 61 are not located on the same vertical plane, and the horizontally buried connectors 61 are closer to the opening area 4 on the pipe segment than the vertically buried connectors 61. When the steel beam 5 is processed, the corresponding connection bolt 62 holes are processed on the horizontal end 51 and the vertical end 52 of the steel beam 5 according to the position of the embedded connector 61 (the slight offset of the connector 61 position caused by the gap of the pipe joint assembly needs to be considered). The connection bolt 62 holes are waist-shaped holes parallel to the wide side of the beam, which makes it convenient for workers to align the screw of the connection bolt 62 with the hole of the connector 61; it is also convenient for workers to aim at the hole of the connector 61 through the steel beam 5. When the steel beam 5 is installed, the horizontal connector 61 is fixedly connected to the vertical end 52 by the horizontal connection bolt 62, and the vertical connector 61 is fixedly connected to the horizontal end 51 by the vertical connection bolt 62, and a gasket 64 is padded between the head of the connection bolt 62 and the waist-shaped hole.

[0024] This embodiment uses connecting bolts and connectors as connecting parts, which makes it easy to obtain materials and pre-embed the connecting parts in the pipe sections. The connectors are connected by connecting bolts, which makes the installation and disassembly of the steel beams simple, and the disassembled steel beams and connecting bolts can be recycled, reducing construction costs. Example

[0025] This embodiment generally adopts the solution of embodiment 1, in which the connecting member 6 is a steel plate member. Figure 2 , 5 As shown in Figure 6, the steel plate component includes an embedded plate 65 and a stud 66. When processing the connector 6, firstly, a standard-sized steel plate or a large steel plate is punched or the steel plate scraps left over from processing other products in the factory are pressed and cut into small arc-shaped embedded plates 65 corresponding to the inner curvature of the upper and lower ends of the top pipe, and then four rectangular studs 66 (a rectangle parallel to the four sides of the embedded plate 65) are welded at the four top corners in the middle of the convex surface of the embedded plate 65. The studs 66 are welded at the small end. When prefabricating the first pipe section 1 and the second top pipe section, the steel plate component composed of the studs 66 and the embedded plate 65 is buried in the corresponding inner arc surface of the upper and lower ends of the first pipe section 1 and the second pipe section 2 in a manner that the large end of the studs 66 is inward. When installing the steel beam 5, the end faces of the horizontal end 51 and the vertical end 52 that are far from each other are respectively abutted against the concave surfaces of the embedded plates 65 of the upper and lower rows of steel plate components, and it is ensured that the four studs 66 on each embedded plate 65 are spaced two by two on both sides of the horizontal end 51 or the vertical end 52, and then the horizontal end 51 and the vertical end 52 are welded and fixed to the embedded plate 65. Preferably, when welding and fixing the steel beam 5 and the embedded plate 65, the two ends of the steel beam 5 and the corresponding embedded plate 65 are initially welded by spot welding, and then all the embedded plates 65 are welded and fixed to the steel beam 5 one by one after the position of the steel beam 5 is detected to be correct.

[0026] This embodiment uses a small steel plate embedded plate welded with bolts as a connector, which is embedded in the jacking pipe as a whole, so as to ensure the connection strength of the bolts, steel plates and jacking pipe segments. The horizontal and vertical ends are welded and fixed to all embedded plates, so as to effectively prevent the structure from being damaged due to excessive deformation when the pipe segment is opened; the steel beam is welded to the embedded steel plate component in a non-continuous welding method, which can improve work efficiency and save costs.

[0027] The present invention is not limited to the above-mentioned specific implementation modes. For ordinary technicians in this field, various changes made based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A temporary support construction method for a rectangular jacking pipe with a lateral opening, characterized in that: The construction steps include: S1. Prefabricated pipe sections, processed steel beams and connectors: Prefabricated pipe sections, processed steel beams and connectors are respectively prepared in corresponding factories according to the design dimensions; wherein the prefabricated pipe sections include the first pipe section that needs to be opened with holes, the second pipe section that does not need to be opened with holes and the conventional pipe section that does not need to be opened with holes of the same external dimensions; during the pipe section prefabrication process, it is ensured that connectors are pre-embedded on the inner walls of the first pipe section and the second pipe section, and the two pipe sections are pre-embedded with upper and lower rows of connectors above and below the opening area; the processed steel beam has at least one horizontal end and one vertical end in terms of the cross-sectional direction; S2. Pipe jacking construction: After the construction site preparation work is completed, normal pipe jacking construction shall be carried out, and it shall be ensured that the first pipe section is installed in the side opening area of ​​the pipe body of the construction, at least two second pipe sections are installed on each side of the opening area, and conventional pipe sections are installed outside the second pipe sections; S3. Install the steel beam: install a steel beam on the inner wall of the first pipe section and above and below the opening area respectively, and ensure that both ends of the steel beam extend beyond the corresponding end of the opening area by at least two second pipe sections; at the same time, connect and fix the horizontal end and the vertical end to the corresponding connecting parts.

2. A temporary support construction method for a rectangular jacking pipe with a lateral opening according to claim 1, characterized in that: In the prefabricated pipe segments, processed steel beams and connectors in step S1, when the first pipe segment and the second top pipe segment are prefabricated, all connectors on the same pipe segment are arranged both symmetrically on the left and right and symmetrically on the top and bottom.

3. A temporary support construction method for rectangular jacking pipe with side opening according to claim 1, characterized in that: In the prefabricated pipe segments, processed steel beams and connecting parts of step S1, the connecting parts are connectors and connecting bolts. When prefabricating the first pipe segment and the second top pipe segment, only the connector is embedded in the pipe segment, and one end face of the connector connecting bolt is ensured to be flush with the inner wall of the pipe segment, and the other end face of the connector is fixedly connected to the main reinforcement in the pipe segment by welding tie bars.

4. A temporary support construction method for rectangular jacking pipe with side openings according to claim 3, characterized in that: In the prefabricated pipe segments, processed steel beams and connecting parts of step S1, when pre-embedded connectors are inside the first pipe segment and the second top pipe segment, it is ensured that there is a row of horizontally buried connectors and a row of vertically buried connectors above and below the pipe segment, and it is ensured that the horizontally buried connectors and the vertically buried connectors are not located on the same vertical plane, and the horizontally buried connectors are closer to the opening area on the pipe segment than the vertically buried connectors.

5. A temporary support construction method for rectangular jacking pipe with side openings according to claim 4, characterized in that: When processing the steel beam, corresponding waist-shaped holes are processed on the horizontal end and the vertical end of the steel beam according to the position of the embedded connector, and the waist-shaped holes are parallel to the wide side of the beam; when installing the steel beam, the horizontal connector is fixedly connected to the vertical end by horizontal connecting bolts, and the vertical connector is fixedly connected to the horizontal end by vertical connecting bolts.

6. A temporary support construction method for rectangular jacking pipe with side opening according to claim 1, characterized in that: In the prefabricated pipe section, processed steel beam and connecting parts of step S1, the connecting parts are steel plate components, which include embedded plates and studs. When processing the connecting parts, firstly, a standard-sized steel plate or a large piece of steel plate is punched and cut into a small arc-shaped embedded plate corresponding to the inner curvature of the upper and lower ends of the top pipe, and then four rectangular studs (rectangles parallel to the four sides of the embedded plate) arranged at the four top corners are welded in the middle of the convex surface of the embedded plate, and the studs are welded at the small head end; when prefabricating the first pipe section and the second top pipe section, the steel plate component composed of the studs and the embedded plates is buried inwardly at the corresponding position of the inner arc surface of the upper and lower ends of the first pipe section and the second top pipe section with the large head end of the studs facing inward.

7. A temporary support construction method for rectangular jacking pipe with side openings according to claim 6, characterized in that: In the installation of the steel beam in step S3, the end faces of the horizontal end and the vertical end that are far away from each other are respectively abutted against the concave surfaces of the embedded plates of the upper and lower rows of steel plate components, and it is ensured that the four bolts on each embedded plate are spaced apart in pairs on both sides of the horizontal end or the vertical end, and then the horizontal end and the vertical end are welded and fixed to the embedded plate.

8. A temporary support construction method for rectangular jacking pipe with side openings according to claim 7, characterized in that: In the step S3 of installing the steel beam, when welding and fixing the steel beam and the embedded plate, the two ends of the steel beam are firstly welded to the corresponding embedded plates by spot welding, and then all the embedded plates and the steel beam are welded and fixed one by one after checking that the position of the steel beam is correct.

9. A temporary support construction method for rectangular jacking pipe with side openings according to claim 1, characterized in that: The number of the first pipe segments is determined according to the size of the hole area actually required and the length of the pipe segments.

10. A temporary support construction method for rectangular jacking pipe with side openings according to claim 1, characterized in that: The steel beam adopts an L-shaped structural beam with an L-shaped cross section or a box-shaped structural beam formed by welding ribs parallel to the horizontal end and the vertical end on the inner side of the L-shaped structural beam.

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