Construction method for receiving tube push bench in existing narrow inspection well

Abstract

The invention discloses a construction method for receiving a pipe jacking machine in an existing narrow inspection well. The construction method comprises the steps that construction preparation is conducted; a receiving transverse hole is excavated; pipe-jacking tunneling is conducted; hoisting and overturning; the pipe jacking machine is hoisted away; constructing a newly-built sewer pipeline; backfilling the receiving transverse hole; and finishing the construction. The method is ingenious in conception and convenient to construct, the receiving transverse hole is excavated in the bottom of the existing inspection well, secondary construction is conducted on the internal structure of the existing receiving well, the internal space of the receiving well is optimized, the receiving work of the pipe jacking machine is completed, the construction period is effectively shortened, the construction cost is effectively reduced, and the construction efficiency is improved. And the purposes of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking construction, and in particular to a construction method for receiving a pipe jacking machine in an existing narrow inspection well. Background Art

[0002] Pipe jacking construction is a trenchless construction method, a pipeline burial construction technology that does not involve excavation or requires minimal excavation. Pipe jacking construction is to use the jacking force generated by the jacking equipment in the starting well 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 pipeline is pushed into the soil layer, the next section of the pipeline will continue to be 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 jacking machine from the starting well through the soil layer to the receiving well. The pipeline follows the pipe jacking machine and gradually completes the laying of the pipeline between the starting well and the receiving well.

[0003] Due to the convenience and speed of pipe jacking construction and the small amount of open excavation, it is often used in the relocation of urban rainwater and sewage pipelines. In the relocation of urban rainwater and sewage pipelines, in order to save construction costs and reduce the amount of traffic relocation work, existing inspection wells are often used as receiving wells. However, the diameter of the existing inspection wells located in the downtown area is relatively small. According to the current construction method, the narrow existing receiving wells cannot meet the construction space requirements. For this reason, a temporary receiving well with a larger diameter has to be temporarily constructed nearby. After the reception is completed, the temporary receiving well will be backfilled and traffic will be restored. The temporary receiving well is built only to receive the pipe jacking machine. After the pipe jacking machine is received, it needs to be backfilled, which is an extra workload, wastes costs, and delays the construction period. Moreover, the temporary receiving well needs to vacate the construction site and traffic diversion needs to be carried out, which increases the workload again.

[0004] Therefore, how to complete the reception of the pipe jacking machine through the narrow existing inspection well without digging a temporary receiving well has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to propose a construction method for receiving a pipe jacking machine in an existing narrow inspection well, so as to solve the technical problems described in the background technology.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A construction method for receiving a pipe jacking machine in an existing narrow inspection well comprises the following steps: Step S1, construction preparation, closing the lane around the existing inspection well opening and removing the existing inspection well opening obstructions; Step S2, excavating a receiving transverse hole, excavating a receiving transverse hole at the bottom of the existing inspection well along the axis of the newly built sewer pipe and synchronously performing necessary support on the receiving transverse hole as the excavation progresses; Step S3, pipe jacking, the pipe jacking machine continues to excavate into the receiving horizontal tunnel and along the receiving horizontal tunnel until the pipe jacking machine cutter head enters the existing inspection well; Step S4, lifting and flipping, connecting and fixing the lifting assembly at the position of the pipe jacking machine cutter head, and using the lifting assembly to pull the pipe jacking machine out of the receiving horizontal hole while lifting it, so that it is gradually flipped from a sideways state to an upright state; Step S5, the pipe jacking machine is lifted out, and the pipe jacking machine in an upright state is lifted out of the existing inspection well by means of a lifting assembly; Step S6, construction of a new sewer pipe, completing the construction of the last section of the new sewer pipe; Step S7, backfilling the receiving transverse tunnel, backfilling the receiving transverse tunnel and closing the tunnel door; Step S8, construction is completed, the existing inspection well opening shield is reconstructed, and road traffic is restored.

[0007] Preferably, the step S2 specifically includes: Step S21, determining the excavation position of the receiving horizontal hole on the bottom wall of the existing inspection well and popping up the excavation reference line; Step S22, constructing a pipe shed at the receiving cross hole ceiling position; Step S23, breaking the shaft wall concrete at the receiving horizontal hole portal position; Step S24, excavating a receiving transverse hole along the axis of the newly built sewer pipe and installing supporting beams and supporting columns to support the pipe shed as the excavation progresses until the excavation depth is reached.

[0008] Preferably, the step S22 specifically includes: Step S221, drilling a hole at the ceiling position of the receiving horizontal hole by a coring machine; Step S222, installing a ceiling steel pipe in the drilled hole, the steel pipe matches the borehole diameter, the internal space of the pipe cavity is densely filled with concrete slurry, the axis is set along the depth direction of the receiving horizontal hole, and the setting length is not less than the cavern depth of the receiving horizontal hole.

[0009] Preferably, the step S23 specifically includes: Step S231, drilling holes in the shaft wall concrete at the tunnel portal position of the receiving horizontal tunnel by a coring machine to cut the shaft wall concrete at the tunnel portal position into blocks; Step S232, cutting off the cut shaft wall concrete.

[0010] Preferably, the supporting cross beams and supporting columns are both made of square steel.

[0011] Preferably, the height of the receiving transverse hole is not less than three times the diameter of the pipe jacking machine body, the depth of the receiving transverse hole is not less than the length of the pipe jacking machine body, and the width of the receiving transverse hole is not less than twice the diameter of the pipe jacking machine body.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has ingenious conception and is easy to construct. By excavating a receiving cross hole at the bottom of an existing inspection well, the internal structure of the existing receiving well is reconstructed without additional construction and additional traffic diversion, thereby optimizing its internal space and completing the receiving work of the pipe jacking machine, effectively saving construction period and construction costs, and achieving the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein: Figure 1 It is a cross-sectional structural schematic diagram of the pipe shed after installation of the present invention; Figure 2 It is a schematic diagram of the vertical cross-section structure along the length direction of the pipe shed after the pipe shed of the present invention is installed; Figure 3 It is a schematic diagram of a vertical cross-section structure perpendicular to the length direction of the pipe shed after the pipe shed of the present invention is installed; Figure 4 It is a schematic cross-sectional structure diagram of the supporting cross beam and supporting column after installation of the present invention; Figure 5 It is a schematic diagram of the vertical section structure after the support beam and the support column of the present invention are installed; Figure 6 It is a cross-sectional structural schematic diagram of the pipe jacking machine of the present invention at the lifting stage; Figure 7 It is a schematic diagram of the vertical section structure of the pipe jacking machine of the present invention at the lifting stage; Figure 8 It is a schematic diagram of the vertical section structure of the pipe jacking machine of the present invention at the turning stage; Fig. 9 It is a schematic diagram of the vertical section structure of the pipe jacking machine of the present invention during the vertical lifting stage.

[0014] Figure numerals: 1. Existing inspection well; 2. Existing sewer pipe; 3. New sewer pipe; 4. Receiving cross hole; 5. Pipe jacking machine; 6. Pipe rack; 7. Supporting beam; 8. Supporting column; 9. Lifting assembly. DETAILED DESCRIPTION

[0015] Hereinafter, an embodiment of a pipe jacking machine receiving well structure that utilizes the transformation of an existing narrow inspection well will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all explanatory and exemplary and should not be construed as limitations on the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and specification of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments described herein.

[0016] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "vertical", "upright", "oblique", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0018] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figure 1-9 , the preferred embodiments of the present invention are further described in detail: like Figure 1-5As shown, the preferred structure of the receiving well of the pipe jacking machine of the present invention is transformed by utilizing the existing narrow inspection well, including the existing inspection well 1 and the receiving transverse hole 4, the well diameter of the existing inspection well 1 is not greater than the body length of the pipe jacking machine 5, the receiving transverse hole 4 is opened at the exit position of the pipe jacking machine 5, the receiving transverse hole 4 is opened along the axis of the newly built sewer pipe 3, the hole opening of the receiving transverse hole 4 is connected with the existing inspection well 1, and the cavern height of the receiving transverse hole 4 is greater than the body diameter of the pipe jacking machine 5 to ensure that the pipe jacking machine 5 can gradually complete the state transition from the side lying state to the inclined state to the upright state, so as to make It can be lifted out of the relatively narrow existing inspection well 1 in an upright state. Of course, the premise for the present invention to function is that the diameter of the existing inspection well 1 must be larger than the body diameter of the pipe jacking machine 1, the comprehensive receiving transverse hole 4 must satisfy the pipe jacking machine 5 has sufficient turning space, and the on-site construction personnel have appropriate additional standing and construction space, the chamber height of the receiving transverse hole 4 is not less than three times the body diameter of the pipe jacking machine 5, the chamber depth of the receiving transverse hole 4 is not less than the body length of the pipe jacking machine 5, and the chamber width of the receiving transverse hole 4 is not less than twice the body diameter of the pipe jacking machine 5; In order to ensure the stability of the receiving tunnel 4 chamber structure and prevent it from collapsing and roof caving during the excavation and use stages, a support structure is arranged inside the receiving tunnel 4. Taking into account that the geological conditions under the existing road surface are relatively good, the support structure should be arranged to include a pipe shed 6, a supporting beam 7 and a supporting column 8. The pipe shed 6 is fixedly arranged at the ceiling position of the receiving tunnel 4, and the supporting beam 7 is arranged below the pipe shed 6 to support and reinforce the pipe shed 6. The supporting column 8 is vertically arranged at the side wall position of the receiving tunnel 4, and its top end is against the end of the supporting beam 7. Of course, when the stratum moisture content and the stratum permeability coefficient are high, drainage and waterproofing measures can be supplemented to ensure that the receiving construction can proceed smoothly. In order to ensure the strength of the support structure itself while making it easy to construct, the pipe shed 6 should be made of steel pipes filled with concrete slurry, and the supporting beam 7 and the supporting column 8 should be made of square steel.

[0019] In addition, the present invention also provides a construction method for receiving a pipe jacking machine in an existing narrow inspection well by using the above-mentioned pipe jacking machine receiving well structure transformed from an existing narrow inspection well, which specifically includes the following steps: Step S1, construction preparation, closing the lane around the wellhead of the existing inspection well 1, and removing the wellhead shielding of the existing inspection well 1 (structures such as wellhead cover and roof); Step S2, excavating a receiving transverse hole 4, excavating a receiving transverse hole 4 along the axis of the newly built sewer pipe 3 at the bottom of the existing inspection well 1 and simultaneously performing necessary support on the receiving transverse hole 4 as the excavation progresses, the receiving transverse hole 4 can be excavated in advance, or it can be excavated after the pipe jacking machine 5 is pushed to the bottom of the receiving transverse hole 4, and the excavation timing is determined according to the on-site construction conditions. The excavation steps specifically include: Step S21, determining the excavation position of the receiving horizontal hole 4 on the bottom wall of the existing inspection well 1 and popping up the excavation reference line; Step S22, as Figure 1-3 As shown, a pipe shed 6 is constructed at the ceiling position of the receiving cross tunnel 4, specifically including: Step S221, drilling a hole at the ceiling position of the receiving horizontal hole 4 by a coring machine; Step S222, installing a ceiling steel pipe in the drilled hole, wherein the steel pipe matches the borehole diameter, and the inner space of the pipe cavity is densely filled with concrete slurry (grouting is performed by grouting equipment after the ceiling steel pipe is installed), and the axis thereof is arranged along the depth direction of the receiving horizontal hole 4, and the arrangement length thereof is not less than the cavern depth of the receiving horizontal hole 4; Step S23, breaking the shaft wall concrete at the position of the receiving horizontal tunnel 4 door, specifically includes: Step S231, drilling holes on the shaft wall concrete at the tunnel portal position of the receiving horizontal tunnel 4 by a coring machine to cut the shaft wall concrete at the tunnel portal position into blocks; Step S232, cutting away the cut shaft wall concrete; Step S24, as Figure 4-5 As shown, a receiving transverse hole 4 is excavated along the axis of the newly built sewer pipe 3 and supporting beams 7 and supporting columns 8 are installed as the excavation progresses to support the pipe shed 6 until the excavation depth is reached; Step S3, pipe jacking excavation, the pipe jacking machine 5 continues to excavate into the receiving horizontal tunnel 4 and along the receiving horizontal tunnel 4 until the cutter head of the pipe jacking machine 5 enters the existing inspection well 1; Step S4, lifting and flipping, such as Figure 6-8 As shown, a fixed hoisting assembly 9 is connected to the cutter head position of the pipe jacking machine 5, and the pipe jacking machine 5 is pulled out and hoisted from the receiving horizontal hole 4 by the hoisting assembly 9, so that it is gradually turned over from a side-lying state to an upright state; Step S5, the pipe jacking machine 5 is lifted off, such as Fig. 9 As shown, the pipe jacking machine 5 in an upright state is lifted out of the existing inspection well 1 by means of the lifting assembly 9; Step S6, constructing the new sewer pipe 3, completing the construction of the last section of the new sewer pipe 3; Step S7, backfilling the receiving transverse hole 4, backfilling the receiving transverse hole 4, closing the hole door and constructing waterproof measures; Step S8, construction is completed, the existing inspection well 1 wellhead shield is reconstructed, and road traffic is restored.

[0020] Example 1 Next, taking a certain actual engineering application example as an example, the above-mentioned structure and method of the present application are introduced. In this example, the diameter of the existing inspection well 1 is 1.0m, which is located in the middle of the existing lane. The newly built sewer pipe 3 is at a 90° angle with the existing inspection well 1. The model of the pipe jacking machine 5 is RASA DHFs450, its length is 2.3m, and its diameter is 50mm. The size of the excavated receiving cross hole 4 is 2.5m (length / depth) × 1.0m (width) × 1.5m (height). The ceiling steel pipe adopts a 100mm diameter steel pipe with a setting length of 2.5m. The ceiling steel pipes are densely arranged, and the gap between the ceiling steel pipes is not more than 10mm. The bottom is arranged with 50mm×100mm square steel pipes as supporting beams 7 and supporting columns 8 at intervals of 500mm. After the head of the pipe jacking machine 5 enters the existing inspection well 1 for at least 0.5m, a lifting point is welded at its cutter head and connected to the lifting component 9 for lifting.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for receiving a pipe jacking machine in an existing narrow inspection well, characterized in that: The steps include: Step S1, construction preparation, closing the lane around the wellhead of the existing inspection well (1) and removing the obstruction of the wellhead of the existing inspection well (1); Step S2, excavating a receiving transverse hole (4), excavating a receiving transverse hole (4) at the bottom of the existing inspection well (1) along the axis of the newly built sewer pipe (3) and synchronously performing necessary support on the receiving transverse hole (4) as the excavation progresses; Step S3, pipe jacking excavation, the pipe jacking machine (5) continues to excavate into the receiving transverse tunnel (4) and moves along the receiving transverse tunnel (4) until the cutter head of the pipe jacking machine (5) enters the existing inspection well (1); Step S4, lifting and flipping, connecting and fixing the lifting assembly (9) at the position of the cutter head of the pipe jacking machine (5), and pulling and lifting the pipe jacking machine (5) from the receiving horizontal hole (4) by means of the lifting assembly (9), so that the pipe jacking machine (5) is gradually flipped from a side-lying state to an upright state; Step S5, lifting the pipe jacking machine (5), lifting the pipe jacking machine (5) in an upright state out of the existing inspection well (1) by means of a lifting assembly (9); Step S6, construction of the new sewer pipe (3), completing the construction of the last section of the new sewer pipe (3); Step S7, backfilling the receiving transverse tunnel (4), backfilling the receiving transverse tunnel (4) and closing the tunnel door; Step S8, construction is completed, the existing inspection well (1) wellhead shield is reconstructed, and road traffic is restored.

2. A construction method for receiving a pipe jacking machine in an existing narrow inspection well according to claim 1, characterized in that: The step S2 specifically includes: Step S21, determining the excavation position of the receiving horizontal hole (4) on the bottom wall of the existing inspection well (1) and popping up the excavation reference line; Step S22, constructing a pipe shed (6) at the ceiling position of the receiving horizontal tunnel (4); Step S23, breaking the shaft wall concrete at the tunnel entrance position of the receiving horizontal tunnel (4); Step S24, excavating a receiving transverse hole (4) along the axis of the newly built sewer pipe (3) and installing supporting crossbeams (7) and supporting columns (8) to support the pipe shed (6) as the excavation progresses until the excavation depth is reached.

3. A construction method for receiving a pipe jacking machine in an existing narrow inspection well according to claim 2, characterized in that: The step S22 specifically includes: Step S221, drilling a hole at the ceiling position of the receiving horizontal hole (4) by using a coring machine; Step S222, installing a ceiling steel pipe in the drilled hole, wherein the steel pipe matches the borehole diameter, the inner space of the pipe cavity is densely filled with concrete slurry, the axis is arranged along the depth direction of the receiving transverse hole (4), and the arrangement length is not less than the cave depth of the receiving transverse hole (4).

4. A construction method for receiving a pipe jacking machine in an existing narrow inspection well according to claim 2, characterized in that: The step S23 specifically includes: Step S231, drilling holes in the shaft wall concrete at the tunnel entrance position of the receiving horizontal tunnel (4) by means of a coring machine to cut the shaft wall concrete at the tunnel entrance position into blocks; Step S232, cutting off the cut shaft wall concrete.

5. A construction method for receiving a pipe jacking machine in an existing narrow inspection well according to claim 2, characterized in that: The supporting cross beam (7) and the supporting column (8) are both made of square steel.

6. A construction method for receiving a pipe jacking machine in an existing narrow inspection well according to claim 1, characterized in that: The height of the chamber of the receiving transverse hole (4) is not less than three times the diameter of the body of the pipe jacking machine (5), the depth of the chamber of the receiving transverse hole (4) is not less than the length of the body of the pipe jacking machine (5), and the width of the chamber of the receiving transverse hole (4) is not less than two times the diameter of the body of the pipe jacking machine (5).

Images