Advanced support device for tunnel body section pipe shed

Abstract

The utility model discloses a tunnel body section pipe shed forepoling device which comprises a pipe shed, a tunnel body section pipe shed, a tunnel body section pipe shed supporting device and a tunnel body section pipe shed supporting device. The pipe shed comprises a plurality of pipe shed pipes, the annular distance between every two adjacent pipe shed pipes is 50 cm, the two adjacent pipe shed pipes are connected through screw threads, the driving length of each pipe shed pipe is kept between 20 m and 40 m, a reinforcement cage is placed in each pipe shed pipe, and double-liquid slurry is poured into each pipe shed pipe. A plurality of slurry discharge holes are formed in the surfaces of the pipe shed pipes; wherein the reinforcement cage comprises stirrups and main reinforcements, the stirrups are arranged in the pipe roof pipe in a sleeved mode, the multiple main reinforcements are arranged between the pipe roof pipe and the stirrups, the main reinforcements are welded to the surfaces of the multiple stirrups, and the multiple stirrups are distributed in the length direction of the main reinforcements at intervals; compared with a common advanced pipe shed, the advanced supporting device for the pipe shed of the tunnel body section is higher in stability, stronger in supporting effect and higher in applicability to an under-crossing tunnel with strict control over ground surface settlement and structure change.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hole body section pipe roof advanced support device, more specifically, the utility model relates to a hole body section pipe roof advanced support device. BACKGROUND

[0002] At present, the advanced support in domestic is a kind of auxiliary measure that is adopted in advance of the working face excavation to ensure the stability of tunnel engineering excavation face.The main modes are pipe roof, small guide pipe, anchor rod, etc.

[0003] The advanced small guide pipe is mainly used in the construction of soft and broken rock stratum, plays a reinforcing role on loose rock stratum, and enhances the stability of loose and soft surrounding rock after grouting.It is beneficial to the stability of surrounding rock within the time of completing excavation and initial support, so as not to cause the instability and damage of surrounding rock until collapse.

[0004] The advanced pipe roof is mainly used in soft and broken surrounding rock tunnel engineering with strict requirements on surrounding rock deformation and surface subsidence, and is a temporary support method for providing enhanced stratum bearing capacity in advance under special conditions.The steel pipe or steel insert plate is used as longitudinal pre-support, and the steel arch is used as transverse ring support, to form a support system with large longitudinal and transverse stiffness, which prevents and limits the deformation of surrounding rock and bears early surrounding rock pressure in advance.

[0005] The specific role of the advanced anchor rod is that the advanced anchor rod is driven into the stable rock stratum in front of the excavation, and the tail end is supported on the radial suspension anchor rod that provides a fulcrum for the advanced anchor rod in the arch surrounding rock, or is supported on the anchor rod as support, so that it can effectively constrain the surrounding rock above the arch within the excavation range and prevent the surrounding rock from relaxing and collapsing within a certain time after blasting.

[0006] In the construction process of shallow-buried loess tunnel under important structures, surface subsidence and structure damage are easily caused, and the advanced support of common advanced pipe roof, advanced small guide pipe and advanced anchor rod has low safety factor and large safety risk. CONTENT OF THE UTILITY MODEL

[0007] In order to achieve these purposes and other advantages according to the utility model, a preferred embodiment of the utility model provides a hole body section pipe roof advanced support device, which comprises:

[0008] The pipe roof is inserted and installed on the tunnel hole body section excavation face, the pipe roof comprises a plurality of pipe roof pipes, the circumferential spacing between two adjacent pipe roof pipes is 50cm, and the two are connected through a screw thread, the setting length of each pipe roof pipe is kept at 20-40m, a steel reinforcement cage is placed in each pipe roof pipe, and the pipe roof pipe is filled with double-liquid slurry, and a plurality of grouting holes are formed on the surface of the pipe roof pipe.

[0009] The steel reinforcement cage comprises stirrups and main bars, the stirrups are sleeved in the pipe roof pipe, a plurality of main bars are arranged between the pipe roof pipe and the stirrups, the main bars are welded on the surfaces of the plurality of stirrups, and the stirrups are spaced along the length direction of the main bars.

[0010] According to a preferred embodiment of the utility model, a plurality of slurry discharge holes are distributed along the length direction of the pipe roof pipe.

[0011] According to a preferred embodiment of the utility model, the angle between the axis and the outer edge line of the pipe roof pipe is kept at 1-3°.

[0012] According to a preferred embodiment of the utility model, after the double-liquid slurry is discharged from the pipe roof pipe into the surrounding soil through the slurry discharge hole, cement slurry is injected into the pipe roof pipe.

[0013] According to a preferred embodiment of the utility model, the double-liquid slurry comprises cement slurry and water glass with a volume ratio of 1:0.5.

[0014] According to a preferred embodiment of the utility model, a plurality of slurry discharge holes are also distributed along the radial direction of the pipe roof pipe.

[0015] According to a preferred embodiment of the utility model, a guide steel pipe is also arranged on the tunnel body section excavation surface and located outside the pipe roof.

[0016] According to a preferred embodiment of the utility model, a plurality of rows of connecting protrusions are arranged on the surface of the main bar along the length direction of the main bar, the plurality of rows of connecting protrusions are distributed along the radial direction of the main bar, the surface of each row of connecting protrusions comprises a plurality of connecting protrusions, and the connecting protrusions in adjacent two rows of connecting protrusions are arranged staggeredly.

[0017] The tunnel body section pipe roof forepoling device has the advantages that compared with the common forepoling pipe roof, the tunnel body section pipe roof forepoling device has higher stability and stronger supporting effect, is more suitable for the underpass tunnel which needs to strictly control the ground subsidence and structure change.

[0018] Other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by those skilled in the art through research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a structural schematic view of the tunnel body section pipe roof forepoling device in the utility model.

[0020] Fig. 2 It is a structural schematic view of the steel reinforcement cage in the utility model. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0024] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0025] like Figs. 1-2 As shown, a preferred embodiment of this utility model provides an advanced support device for the tunnel section pipe roof, comprising:

[0026] The pipe roof is inserted and installed on the excavation face of section 4 of the tunnel body; the pipe roof consists of multiple pipe roof pipes 1, with a circumferential spacing of 50cm between two adjacent pipe roof pipes 1, and the two are connected by threaded joints. The installation length of each pipe roof pipe 1 is maintained at 20-40m. A steel cage is placed inside each pipe roof pipe, and the pipe roof pipe is filled with double-liquid grout; several grout discharge holes are opened on the surface of the pipe roof pipe.

[0027] The steel cage includes stirrups 2 and main bars 3. The stirrups 2 are sleeved inside the pipe shed 1. Multiple main bars 3 are arranged between the pipe shed 1 and the stirrups. The main bars are welded to the surface of the multiple stirrups. There are multiple stirrups, which are distributed at intervals along the length of the main bars.

[0028] After the two-component grout is discharged from the pipe roof through the grout discharge hole and enters the surrounding soil layer, cement grout is injected into the pipe roof.

[0029] In the technical scheme, the steel cage with the main reinforcement is placed in the pipe, and the double-liquid slurry is poured, the surrounding soil is diffused and consolidated, the double-liquid slurry in the pipe is discharged after the grouting is completed, the double-liquid slurry has the advantages of short gel time and high stone rate of grouting body and certain strength, the soil around the pipe shed can be quickly consolidated, the stability is higher, the pipe shed bending resistance is further improved by filling the steel pipe with the M20 cement mortar after the grouting is completed, the bending resistance of the pipe shed is further improved by filling the cement mortar, the soil layer stress and the ground load are borne, the subsequent construction tunnel surrounding rock displacement, tunnel structure displacement and highway pavement displacement meet the design requirements after the slurry strength meets the design requirements, the pipe shed has higher stability and stronger supporting effect compared with the common pipe shed, and the pipe shed is more suitable for the underpass tunnel which needs to strictly control the ground settlement and structure change.

[0030] According to a preferred embodiment of the utility model, a plurality of slurry holes are distributed along the length direction of the pipe shed pipe, so that the slurry in the pipe shed pipe can be uniformly distributed.

[0031] According to a preferred embodiment of the utility model, the axis of the pipe shed pipe and the outer edge line angle are kept at 1-3°.

[0032] According to a preferred embodiment of the utility model, the double-liquid slurry comprises cement slurry and water glass with a volume ratio of 1:0.5, has short gel time and high stone rate of grouting body.

[0033] According to a preferred embodiment of the utility model, a plurality of slurry holes are also distributed along the radial direction of the pipe shed pipe.

[0034] According to a preferred embodiment of the utility model, a guide steel pipe is also arranged on the tunnel hole section excavation surface and located on the outer side of the pipe shed. The guide steel pipe is arranged to ensure the angle of the pipe shed construction, so that the pipe shed does not tilt too high upward and lose the supporting effect due to the too large setting angle.

[0035] According to a preferred embodiment of the utility model, a plurality of connecting protrusions are arranged on the surface of the main reinforcement along the length direction of the main reinforcement, the connecting protrusions are distributed along the radial direction of the main reinforcement, the surface of each connecting protrusion row comprises a plurality of connecting protrusions, and the connecting protrusions in the adjacent two connecting protrusion rows are arranged staggeredly, so that the contact area of the main reinforcement and the cement mortar is increased, and the connecting strength is increased.

[0036] Although the embodiments of the utility model have been disclosed as above, they are not limited to the application listed in the specification and the embodiments, and can be applied to various fields suitable for the utility model, and other modifications can be easily realized by those skilled in the art, so that the utility model is not limited to specific details and the drawings shown and described herein without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A device for advanced support of a pipe roof of a tunnel section, characterized in that The application relates to a pipe roof, which is inserted and installed on a tunnel hole body section excavation face; the pipe roof comprises a plurality of pipe roof pipes, the circumferential interval between two adjacent pipe roof pipes is 50 cm, the two pipe roof pipes are connected through threads, the setting length of each pipe roof pipe is kept at 20-40 m, a steel cage is arranged in each pipe roof pipe, and double-liquid slurry is poured into the pipe roof pipe; a plurality of grouting holes are formed on the surface of the pipe roof pipe. The steel cage comprises stirrups and main bars, the stirrups are sleeved in the pipe roof pipe, a plurality of main bars are arranged between the pipe roof pipe and the stirrups, the main bars are welded on the surfaces of the plurality of stirrups, and the plurality of stirrups are distributed along the length direction of the main bars. The plurality of grouting holes are distributed along the length direction of the pipe roof pipe.

2. The device according to claim 1, characterized in that, The angle between the axis of the pipe roof pipe and the outer edge line is kept at 1-3 degrees.

3. The device of claim 1, wherein, The double-liquid slurry comprises cement slurry and water glass with a volume ratio of 1:0.

5.

4. The device of claim 1, wherein, The plurality of grouting holes are also distributed along the radial direction of the pipe roof pipe.

5. The device of claim 2, wherein, A guide steel pipe is arranged on the pipe roof and located outside the pipe roof.

6. The device of claim 1, wherein, The surface of the main bar is provided with a plurality of rows of connecting protrusions along the length direction of the main bar, the plurality of rows of connecting protrusions are distributed along the radial direction of the main bar, the surface of each row of connecting protrusions comprises a plurality of connecting protrusions, and the connecting protrusions in two adjacent rows of connecting protrusions are arranged staggeredly.

7. The device of claim 1, wherein, ​

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