A rapid construction method for a pipe roof

Abstract

The present invention discloses a rapid construction method for a pipe curtain, which includes the following steps: constructing a launching shaft and a receiving shaft; measuring and setting out lines, marking the positions where steel pipes are to be driven to form a pipe curtain contour; the directional drill bit horizontally drills along the pipe curtain contour from the launching shaft towards the receiving shaft to obtain a long strip-shaped slot; manufacturing a first steel pipe combination, fixing the first steel pipe combination to the directional drill bit in the receiving shaft, and using the back dragging of the directional drill bit to drive the first steel pipe combination to be inserted into the long strip-shaped slot; leaving one group of pipe positions at intervals, repeating the above steps until all the first steel pipe combinations within the pipe curtain contour are constructed; manufacturing a second steel pipe combination and driving the second steel pipe combination between two adjacent first steel pipe combinations in the same manner; after the pipe curtain wall construction is completed, blocking the two ends of the steel pipes and performing backward pressure grouting from the middle section of the pipes to both ends. In the present invention, a directional drilling rig can be used to drill holes along the pipe curtain contour, greatly improving the accuracy and efficiency of pipe curtain construction and shortening the construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and more specifically, to a rapid construction method for pipe roofs. Background Art

[0002] With the rapid development of domestic basic transportation facilities, more and more tunnel projects are being constructed. The pipe roof method is a new construction method in recent years. For underground projects with shallow burial depth, large cross-section and complex geological conditions, the pipe roof method has incomparable advantages over other construction methods, which can greatly reduce the impact of construction on ground activities and other underground facilities and pipelines. Especially for strata where the excavation surface cannot stand on its own, it can provide temporary soil retaining and water stop facilities.

[0003] At present, the application of the pipe roof method still has many limitations. Due to restrictions such as construction equipment, the pipe diameter of the pipe roof is generally above 970 mm, and the pipe diameter of short-distance small pipe roofs also reaches above 600 mm. However, during the construction process, there are often projects that need to use smaller-diameter pipe roofs due to environmental factors, and the existing construction equipment cannot meet the construction requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing construction equipment cannot construct micro pipe roofs. In order to overcome the defects of the prior art, the present invention proposes a rapid construction method for pipe roofs, which uses a directional drilling rig to drill holes along the contour of the pipe roof. Each drilling can produce a long strip-shaped slot hole, and at the same time, the first steel pipe combination or the second steel pipe combination is pulled into the long strip-shaped slot hole by the back dragging of the directional drilling rig, greatly improving the accuracy and efficiency of pipe roof construction and shortening the construction period.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The present invention provides a rapid construction method for pipe roofs, including the following steps:

[0007] S1. Construct a launching shaft and a receiving shaft according to the tunnel length;

[0008] S2. According to the designed shape and size of the pipe roof, conduct precise measurement and layout on the inner walls of the launching shaft and the receiving shaft, and mark the positions where the steel pipes are to be driven to form the pipe roof contour;

[0009] S3. Horizontally drill the directional drill bit along the pipe roof contour from the launching shaft towards the receiving shaft, accurately penetrate the surrounding rock mass and obtain a long strip-shaped slot hole;

[0010] S4. Fabricate the first steel pipe combination, fix one end of the first steel pipe combination to the directional drill bit in the receiving shaft, and use the back dragging of the directional drill bit to drive the first steel pipe combination to insert into the long strip-shaped slot hole;

[0011] S5. Leave one pipe position interval, and repeat steps S3 and S4 until all the first steel pipe combinations within the pipe curtain contour are constructed;

[0012] S6. Fabricate the second steel pipe combination, and drive the second steel pipe combination between two adjacent first steel pipe combinations in the same manner to complete the construction of the entire pipe curtain wall;

[0013] S7. After the construction of the pipe curtain wall is completed, seal the two ends of the steel pipe, and perform backward pressure grouting from the middle section of the pipe to both ends.

[0014] In a preferred technical solution of the present invention, in step S2, after the pipe curtain contour is formed, limit steel plates or pipe curtain door frames are driven along the inner and outer boundaries of the pipe curtain contour.

[0015] In a preferred technical solution of the present invention, both the first steel pipe combination and the second steel pipe combination are composed of a jacking pipe and a connecting piece, and the first steel pipe combination is of a connecting piece - jacking pipe - connecting piece type structure, and the second steel pipe combination is of a jacking pipe - connecting piece - jacking pipe type structure.

[0016] In a preferred technical solution of the present invention, the connecting piece includes a web and an arc plate, two arc plates are symmetrically arranged at both ends of the web, and the end of the web is fixedly connected to the inner side wall of the arc plate.

[0017] In a preferred technical solution of the present invention, two limiting wing plates are symmetrically and fixedly arranged on both sides of the jacking pipe, and the limiting wing plates are clamped with the arc plate.

[0018] In a preferred technical solution of the present invention, two or more grouting holes are opened along the length direction on the jacking pipe, the web and the arc plate, and the grouting holes are arranged in a plum blossom shape.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. A rapid pipe curtain construction method proposed by the present invention uses a directional drilling rig to drill holes along the pipe curtain contour. Each drilling can generate a long strip-shaped slot hole, and at the same time, the first steel pipe combination or the second steel pipe combination is pulled into the long strip-shaped slot hole by the back dragging of the directional drilling rig, greatly improving the precision and efficiency of pipe curtain construction and shortening the construction period;

[0021] 2. The grouting holes on the pipe fittings can grout and reinforce the surrounding soil, ensuring the safety of the construction of the long-distance small-diameter micro pipe curtain with ultra-shallow overburden;

[0022] 3. By setting the connecting piece, the overall strength and stiffness of the pipe curtain wall are greatly enhanced, ensuring the safety of the construction process. Description of the Drawings

[0023] Figure 1 is the construction effect diagram of a rapid pipe curtain construction method provided by the specific embodiment of the present invention;

[0024] Figure 2 is a side view of the pipe curtain;

[0025] Figure 3 is a schematic structural view of the first steel pipe combination;

[0026] Figure 4 is a schematic structural view of the second steel pipe combination;

[0027] Figure 5 is a three-dimensional structural view of the first steel pipe combination.

[0028] In the figure:

[0029] 1. Launching shaft; 2. Receiving shaft; 3. Directional drill bit; 4. First steel pipe combination; 41. Jacking pipe; 42. Connecting piece; 421. Web; 422. Arc plate; 43. Limiting wing plate; 44. Grouting hole; 5. Second steel pipe combination; 6. Limiting steel plate. Specific implementation manners

[0030] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation manners.

[0031] As Figures 1-5 shown, an embodiment provides a rapid construction method for a pipe curtain, including the following steps:

[0032] S1. Construct a launching shaft 1 and a receiving shaft 2 according to the tunnel length, set up a directional drilling rig on one side of the launching shaft 1, and fix a directional drill bit 3 to the power output end of the directional drilling rig;

[0033] S2. According to the designed shape and size of the pipe curtain, conduct precise measurement and layout on the inner walls of the launching shaft 1 and the receiving shaft 2, and mark the positions where the steel pipes are to be driven, forming a pipe curtain contour;

[0034] S3. Horizontally drill the directional drill bit 3 along the pipe curtain contour from the launching shaft 1 towards the receiving shaft 2, accurately penetrate the surrounding rock mass to obtain a long strip-shaped slot hole. The angle of the directional drill bit 3 can be adjusted with high precision. During the drilling process, continuous detection should be maintained to ensure that the directional drill bit 3 always remains horizontal during the drilling process, so as to make the opening position of the long strip-shaped slot hole accurate and ensure the construction quality;

[0035] S4. Fabricate the first steel pipe combination 4, fix one end of the first steel pipe combination 4 to the directional drill bit 3 in the receiving shaft 2, and use the directional drill bit 3 to drag back to drive the first steel pipe combination 4 to be inserted into the long strip-shaped slot hole. Among them, the first steel pipe combination 4 and the directional drill bit 3 adopt a detachable connection method;

[0036] S5. Intervals of one set of pipe positions, repeat steps S3 and S4 until all the first steel pipe combinations 4 within the pipe curtain contour are constructed;

[0037] S6. Fabricate the second steel pipe assembly 5, and drive the second steel pipe assembly 5 between two adjacent first steel pipe assemblies 4 in the same way to complete the construction of the entire pipe curtain wall. Among them, the first steel pipe assembly 4 and the second steel pipe assembly 5 are in plug-in fit, and two or more groups of the first steel pipe assemblies 4 and the second steel pipe assemblies 5 are connected end to end to form a complete pipe curtain wall;

[0038] S7. After the construction of the pipe curtain wall is completed, seal the two ends of the steel pipe, and perform pressure grouting in a retreating manner from the middle of the pipe to both ends.

[0039] Specifically, in step S2, after the pipe curtain profile is formed, drive the limit steel plates 6 or pipe curtain door frames along the inner and outer boundaries of the pipe curtain profile. In this embodiment, the width of the limit steel plate 6 is 1 m. The limit steel plates 6 are arranged at the inner and outer boundaries of the pipe curtain profile, which can play an auxiliary positioning role for the directional drill bit 3, thereby improving the positioning speed of the directional drill bit 3, ensuring the drilling accuracy, and at the same time, the limit steel plates 6 or the pipe curtain door frames can also play a role in protecting the surrounding rock mass, preventing the surrounding rock mass from collapsing during the drilling process of the directional drill bit 3, and ensuring the hole-forming quality.

[0040] Specifically, both the first steel pipe assembly 4 and the second steel pipe assembly 5 are composed of a jacking pipe 41 and a connecting piece 42, and the first steel pipe assembly 4 is of a connecting piece - jacking pipe - connecting piece type structure, and the second steel pipe assembly 5 is of a jacking pipe - connecting piece - jacking pipe type structure. In this embodiment, the jacking pipe 41 and the connecting piece 42 are of a detachable connection structure, and can be conveniently pre-assembled on the ground before construction, so as to save construction time and shorten the construction period. The cross-section of the pipe curtain wall is rectangular. Since the connecting pieces 42 at both ends of the first steel pipe assembly 4 and the jacking pipes 41 at both ends of the second steel pipe assembly 5 can be fixedly connected by plugging, two or more groups of the first steel pipe assemblies 4 and the second steel pipe assemblies 5 can be connected end to end to form a complete pipe curtain wall. In addition, the jacking pipe 41 and the connecting piece 42 are tightly connected, so that the pipe curtain wall structure has strong overall stiffness and strength, and at the same time has good sealing performance.

[0041] Specifically, the connecting piece 42 includes a web 421 and an arc plate 422. Two arc plates 422 are symmetrically arranged at both ends of the web 421, and the end of the web 421 is fixedly connected to the inner side wall of the arc plate 422. In this embodiment, the width of the arc plate 422 is 10 mm, and the arc plate 422 and the web 421 are integrally formed to ensure its structural strength. The end of the web 421 is connected to the center position of the inner side wall of the arc plate 422. During assembly, the staff ensures that the arc plate 422 is in close contact with the outer wall of the jacking pipe 41.

[0042] Specifically, two limiting wing plates 43 are symmetrically and fixedly arranged on both sides of the jacking pipe 41, and the limiting wing plates 43 are clamped with the arc-shaped plates 422. In this embodiment, two limiting wing plates 43 are arranged on each side of the jacking pipe 41, and the 4 limiting wing plates 43 are arranged symmetrically about the central axis of the jacking pipe 41. The limiting wing plates 43 are strip-shaped, the limiting wing plates 43 are fixed to the outer wall of the jacking pipe 41 along the length direction, and the length of the limiting wing plates 43 is equal to the length of the jacking pipe 41. When assembling the first steel pipe combination 4 or the second steel pipe combination 5, the limiting wing plates 43 are inserted between the two arc-shaped plates 422 of the connecting piece 42, and it is ensured that the end faces of the limiting wing plates 43 are in close contact with the arc-shaped plates 422. At this time, since the limiting wing plates 43 are inclined, the jacking pipe 41 cannot move left and right after installation, so as to achieve the purpose of fixedly connecting the jacking pipe 41 and the connecting piece 42. The whole assembling process is simple and fast, and the limiting wing plates 43 and the arc-shaped plates 422 cooperate with each other, so that the sealing performance of the connecting part is good, and it has excellent waterproof and water-stop performance.

[0043] Specifically, two or more grouting holes 44 are provided along the length direction on the jacking pipe 41, the web 421 and the arc-shaped plate 422, and the grouting holes 44 are arranged in a plum blossom shape. In this embodiment, the interval between two adjacent grouting holes 44 is 300 mm. By providing the grouting holes 44, it is convenient to carry out pressure grouting through the grouting holes 44 after the pipe curtain wall construction is completed, so as to reinforce the surrounding soil, making the pipe curtain wall structure particularly suitable for the construction of long-distance small-diameter micro pipe curtains with ultra-shallow overburden.

[0044] The present invention is described by way of preferred embodiments. Those skilled in the art will know that without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A rapid construction method for a pipe curtain, characterized in that, it includes the following steps: S1. Construct a launching shaft (1) and a receiving shaft (2) according to the tunnel length; S2. According to the designed shape and size of the pipe curtain, conduct precise measurement and layout on the inner walls of the launching shaft (1) and the receiving shaft (2), and mark the positions where the steel pipes are to be driven to form the pipe curtain contour; S3. Horizontally drill the directional drill bit (3) along the pipe curtain contour from the launching shaft (1) towards the receiving shaft (2), accurately penetrate the surrounding rock mass and obtain a long strip-shaped slot hole; S4. Fabricate the first steel pipe assembly (4), fix one end of the first steel pipe assembly (4) to the directional drill bit (3) in the receiving shaft (2), and use the back-dragging of the directional drill bit (3) to drive the first steel pipe assembly (4) to insert into the long strip-shaped slot hole; S5. Interleave one set of pipe positions, repeat steps S3 and S4 until all the first steel pipe assemblies (4) within the pipe curtain contour are constructed; S6. Fabricate the second steel pipe assembly (5), and insert the second steel pipe assembly (5) between two adjacent first steel pipe assemblies (4) in the same way to complete the construction of the entire pipe curtain wall; S7. After the construction of the pipe curtain wall is completed, seal the two ends of the steel pipes, and perform back-pressure grouting from the middle section of the pipes towards both ends; The first steel pipe assembly (4) and the second steel pipe assembly (5) are both composed of a jacking pipe (41) and a connecting piece (42), and the first steel pipe assembly (4) is of a connecting piece - jacking pipe - connecting piece type structure, and the second steel pipe assembly (5) is of a jacking pipe - connecting piece - jacking pipe type structure; The connecting piece (42) includes a web (421) and an arc plate (422), two arc plates (422) are symmetrically arranged at both ends of the web (421), and the end of the web (421) is fixedly connected to the inner side wall of the arc plate (422); Two limiting wing plates (43) are symmetrically and fixedly provided on both sides of the jacking pipe (41), and the limiting wing plates (43) are clamped with the arc plate (422); Two or more grouting holes (44) are opened along the length direction on the jacking pipe (41), the web (421) and the arc plate (422), and the grouting holes (44) are arranged in a plum blossom shape.

2. A rapid construction method for a pipe curtain according to claim 1, characterized in that: In step S2, after the pipe curtain contour is formed, drive in limiting steel plates (6) or pipe curtain door frames along the inner and outer boundaries of the pipe curtain contour.

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