A rectangular jacking pipe and a construction method thereof

Abstract

A rectangular top pipe and a construction method thereof, the rectangular top pipe comprises a plurality of pipe sections which are aligned and stacked in sequence and fixed to each other, the pipe section comprising an outer frame layer and an inner frame layer both in the shape of a rectangular frame; a gap is provided between the outer frame layer and the inner frame layer, and the gap forms a cavity layer, and a plurality of reinforcing plates for strengthening the connection strength between the outer frame layer and the inner frame layer are arranged at intervals in the cavity layer; the outer end of the reinforcing plate is fixedly connected to the inner wall surface of the outer frame layer, and the inner end of the reinforcing plate is fixedly connected to the outer surface of the inner frame layer; prestressed holes are respectively provided at the four corners of the cavity; matching tenons and mortise grooves are respectively provided at both ends of the pipe section, and adjacent pipe sections are connected by matching mortise and tenon joints of the tenons and mortise grooves; the cavity and the gap between adjacent pipe sections are filled with a concrete layer.

Description

Technical Field

[0001] The invention belongs to the field of pipelines, and in particular relates to a rectangular jacking pipe and a construction method thereof. Background Art

[0002] With the development of urban rail transit, rectangular pipe jacking has been vigorously promoted as a trenchless construction technology. The rectangular pipe jacking method for constructing underground pedestrian crossings has been successfully applied in many cities in China.

[0003] A Chinese patent with publication number CN 106838463 A discloses a pre-buried component for improving the overall longitudinal stiffness of a rectangular jacking pipe after construction. Each grouting pipe is connected to a prestressed channel through a connecting pipe. The prestressed channel is a pipe buried in the wall of the rectangular jacking pipe along the length direction. One end of the prestressed channel is a small positioning tenon, and the other end is a large positioning tenon. The small positioning tenon extends more than 40 mm from the pipe section end of the rectangular jacking pipe, and the end of the large positioning tenon is flush with the pipe section end of the rectangular jacking pipe. The inner diameter of the large positioning tenon is slightly larger than the outer diameter of the small positioning tenon. A detachable grouting pipe sleeve is installed in the pipe connecting the grouting pipe to the outer wall. The grouting pipe sleeve can seal the outer wall opening of the grouting pipe and retain the passage between the inner wall opening of the grouting pipe and the connecting pipe.

[0004] However, in actual engineering, the longitudinal stiffness of the rectangular jacking pipe and the connection stiffness between the pipe sections are still relatively weak. In the use of the already built crosswalks constructed using the rectangular jacking method, there is a common phenomenon of water leakage at the pipe section connections. If these problems can be solved, it will have a good social and market effect. Summary of the Invention

[0005] In order to overcome the defect of weak connection stiffness between adjacent pipe sections of the rectangular jacking pipe in the background art, the embodiment of the present application provides a rectangular jacking pipe and a construction method thereof that can effectively improve the overall longitudinal stiffness and the stiffness of the pipe section connections.

[0006] The technical solution adopted in the present invention is:

[0007] The embodiment of the present application provides a rectangular top pipe, comprising a plurality of pipe sections aligned and stacked in sequence and fixed to each other, wherein the pipe section comprises an outer frame layer and an inner frame layer, both of which are rectangular frame-shaped; a gap is provided between the outer frame layer and the inner frame layer, and the gap forms a cavity layer, wherein a plurality of reinforcing plates for strengthening the connection strength between the outer frame layer and the inner frame layer are arranged at intervals in the cavity layer; the outer ends of the reinforcing plates are fixedly connected to the inner wall surface of the outer frame layer, and the inner ends of the reinforcing plates are fixedly connected to the outer surface of the inner frame layer;

[0008] Prestressed holes are respectively provided at the four corners of the cavity;

[0009] Both ends of the pipe section are provided with matching tenons and tenons, and two adjacent pipe sections are connected by the matching mortise and tenon joints of the tenons and tenon grooves;

[0010] The cavity and the gaps between adjacent pipe sections are filled with a concrete layer.

[0011] Furthermore, the inner frame layer and the reinforcement plate at one end of the pipe segment both extend beyond the outer frame layer along the length direction of the pipe segment to form the tenon; the inner frame layer and the reinforcement plate at the other end of the pipe segment both retract into the outer frame layer along the length direction of the pipe segment to form the tenon groove.

[0012] Furthermore, the outer frame layer is a reinforced concrete layer.

[0013] Furthermore, the inner frame layer is a steel bar layer.

[0014] Furthermore, the reinforcement plate is a steel plate.

[0015] Furthermore, two ends of the reinforcement plate are respectively perpendicular to the outer frame layer and the inner frame layer.

[0016] Furthermore, the prestressed holes are formed by enclosing angle steel on the inner wall surface of the outer frame layer.

[0017] Furthermore, a waterproof sealing ring is provided between two adjacent pipe sections.

[0018] The method for constructing a rectangular jacking pipe according to the present invention comprises the following steps:

[0019] Step 1: Tie up the steel skeleton of the outer frame layer, and fix the outer end of the reinforcement plate to the steel skeleton of the outer frame layer, and set up the template of the outer frame layer outside the steel skeleton;

[0020] pouring concrete onto the outer frame layer steel skeleton, the outer frame layer steel skeleton and the concrete poured on the outer frame layer steel skeleton form the outer frame layer; the outer end of the reinforcing plate is buried in the outer frame layer, and the inner end of the reinforcing plate is exposed outside the outer frame layer;

[0021] Step 2: Using steel bars to build an inner frame layer within the outer frame layer, and the inner end of the reinforcement plate is fixedly connected to the outer wall surface of the inner frame layer;

[0022] Step 3: pouring concrete into the cavity layer;

[0023] Step 4: dismantling the template erected outside the steel frame to form the pipe segment;

[0024] Step 5: The waterproof sealing ring is set between two adjacent pipe sections and connected through mortise and tenon joints.

[0025] The beneficial effects of the present invention are embodied in:

[0026] The present invention injects concrete into the cavity layer and reserves prestressed holes to tension prestressed tendons after the rectangular jacking pipe is completed, both effectively improving the overall longitudinal stiffness of the rectangular jacking pipe. Furthermore, because the cavity layer runs through the entire rectangular jacking pipe, a multi-layer composite pipe segment is formed after concrete injection. The joints between the pipe segments can be effectively sealed, preventing subsequent leakage at adjacent joints, resulting in excellent market benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a top view of a rectangular jacking pipe in one embodiment;

[0028] Figure 2 This is a front view of a rectangular top pipe in one embodiment. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0032] Refer to the attached Figures 1-2This embodiment provides a rectangular top tube, comprising a plurality of tube sections aligned and stacked in sequence and fixed to each other, wherein the tube section comprises an outer frame layer 1 and an inner frame layer 4, both of which are in the shape of a rectangular frame; a gap is provided between the outer frame layer 1 and the inner frame layer 4, and the gap forms a cavity layer 5, wherein a plurality of reinforcing plates 3 for reinforcing the connection strength between the outer frame layer 1 and the inner frame layer 4 are arranged at intervals in the cavity layer 5; the outer ends of the reinforcing plates 3 are fixedly connected to the inner wall surface of the outer frame layer 1, and the inner ends of the reinforcing plates 3 are fixedly connected to the outer surface of the inner frame layer 4;

[0033] Specifically, the pipe segments are aligned and stacked along the pipe length direction of the pipe segments.

[0034] Prestressed holes 2 are respectively provided at the four corners of the cavity;

[0035] The two ends of the pipe section are respectively provided with a matching tenon a and a tenon groove b, and the adjacent pipe sections are connected by the matching mortise and tenon of the tenon a and the tenon groove b;

[0036] The cavity and the gaps between adjacent pipe sections are filled with a concrete layer.

[0037] Specifically, the inner frame layer 4 and the reinforcement plate 3 at one end of the pipe segment both extend beyond the outer frame layer 1 along the length direction of the pipe segment to form the tenon a; the inner frame layer 4 and the reinforcement plate 3 at the other end of the pipe segment both retract into the outer frame layer 1 along the length direction of the pipe segment to form the tenon b.

[0038] Specifically, the outer frame layer 1 is a reinforced concrete layer.

[0039] Specifically, the inner frame layer 4 is a steel bar layer.

[0040] Specifically, the reinforcement plate 3 is a steel plate.

[0041] Specifically, two ends of the reinforcing plate 3 are perpendicular to the outer frame layer 1 and the inner frame layer 4 respectively.

[0042] Specifically, the inner end of the reinforcing plate 3 is embedded in the outer frame layer 1 and is fixed to the inner frame layer by welding. Specifically, the prestressed hole 2 is formed by angle steel enclosed on the inner wall surface of the outer frame layer 1.

[0043] Specifically, a waterproof sealing ring is provided between two adjacent pipe sections.

[0044] Specifically, the method for constructing a rectangular jacking pipe described in this embodiment includes the following steps:

[0045] Step 1: Tie up the steel skeleton of the outer frame layer 1, and fix the outer end of the reinforcing plate 3 to the steel skeleton of the outer frame layer 1, and set up the template of the outer frame layer 1 outside the steel skeleton;

[0046] Specifically, the outer end of the reinforcing plate 3 is fixed to the steel frame of the outer frame layer 1 by welding.

[0047] Concrete is poured onto the outer frame layer steel skeleton 1, and the outer frame layer steel skeleton and the concrete poured on the outer frame layer steel skeleton form the outer frame layer 1; the outer end of the reinforcing plate 3 is buried in the outer frame layer 1, and the inner end of the reinforcing plate 3 is exposed outside the outer frame layer 1;

[0048] Step 2: Use steel bars to build an inner frame layer 4 inside the outer frame layer 1, and the inner end of the reinforcing plate 3 is fixedly connected to the outer wall surface of the inner frame layer 4;

[0049] Step 3: pouring concrete into the cavity layer 5;

[0050] Step 4: dismantling the template erected outside the steel frame to form the pipe segment;

[0051] Step 5: The waterproof sealing ring is set between two adjacent pipe sections and connected through mortise and tenon joints.

[0052] Concrete is injected into the cavity layer 5 of the present invention. The reserved prestressed holes 2 can be used to tension the prestressed tendons after the rectangular jacking pipe is completed, effectively improving the overall longitudinal stiffness of the rectangular jacking pipe. Furthermore, because the cavity layer 5 runs through the entire rectangular jacking pipe, a multi-layer composite pipe segment is formed after concrete injection. The pipe segment joints can be effectively sealed, preventing water leakage at the joints between adjacent pipe segments in the later stages, thus achieving excellent market benefits.

[0053] The contents described in the embodiments of this specification are merely examples of the implementation forms of the inventive concept. The scope of protection of the present invention should not be regarded as limited to the specific forms described in the embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A method for constructing a rectangular jacking pipe, characterized in that: The rectangular top tube comprises a plurality of tube sections which are aligned and stacked in sequence and fixed to each other, and the tube sections comprise an outer frame layer and an inner frame layer both in the shape of a rectangular frame; there is a gap between the outer frame layer and the inner frame layer, and the gap forms a cavity layer, and a plurality of reinforcing plates for reinforcing the connection strength between the outer frame layer and the inner frame layer are arranged at intervals in the cavity layer; the outer end of the reinforcing plate is fixedly connected to the inner wall surface of the outer frame layer, and the inner end of the reinforcing plate is fixedly connected to the outer surface of the inner frame layer; Prestressed holes are respectively provided at the four corners of the cavity; The two ends of the pipe section are respectively provided with matching tenons and tenon grooves, and the two adjacent pipe sections are connected by the matching mortise and tenon joints of the tenons and the tenon grooves; The cavity and the gap between adjacent pipe sections are filled with a concrete layer; The method comprises the following steps: Step 1: tying the steel skeleton of the outer frame layer, and fixing the outer end of the reinforcing plate to the steel skeleton of the outer frame layer, and setting up the template of the outer frame layer outside the steel skeleton; Concrete is poured onto the outer frame layer steel skeleton, the outer frame layer steel skeleton and the concrete poured onto the outer frame layer steel skeleton form the outer frame layer; the outer end of the reinforcing plate is buried in the outer frame layer, and the inner end of the reinforcing plate is exposed outside the outer frame layer; Step 2: Using steel bars to build an inner frame layer inside the outer frame layer, and the inner end of the reinforcement plate is fixedly connected to the outer wall surface of the inner frame layer; Step 3: pouring concrete into the cavity layer; Step 4, dismantling the template erected outside the steel frame to form the pipe segment; Step 5: Set a waterproof sealing ring between two adjacent pipe sections and connect them through mortise and tenon joints.

2. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: The inner frame layer and the reinforcement plate at one end of the pipe segment both extend beyond the outer frame layer along the length direction of the pipe segment to form the tenon; the inner frame layer and the reinforcement plate at the other end of the pipe segment both retract into the outer frame layer along the length direction of the pipe segment to form the tenon groove.

3. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: The outer frame layer is a reinforced concrete layer.

4. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: The inner frame layer is a steel bar layer.

5. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: The reinforcing plate is a steel plate.

6. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: Two ends of the reinforcing plate are respectively perpendicular to the outer frame layer and the inner frame layer.

7. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: The prestressed holes are formed by enclosing angle steel on the inner wall surface of the outer frame layer.

8. A method for constructing a rectangular jacking pipe according to claim 1, characterized in that: A waterproof sealing ring is provided between two adjacent pipe sections.

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