CN214741374U

CN214741374U - Tunnel preliminary bracing bow member reinforcing apparatus

Info

Publication number: CN214741374U
Application number: CN202120725821.7U
Authority: CN
Inventors: 吴开才; 刘浪; 赵明海; 王刚; 周勇; 刘万嘉
Original assignee: Road And Bridge Engineering Co ltd Of China Railway No5 Engineering Group Co ltd; China Railway No 5 Engineering Group Co Ltd
Current assignee: Road And Bridge Engineering Co ltd Of China Railway No5 Engineering Group Co ltd; China Railway No 5 Engineering Group Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-11-16
Anticipated expiration: 2031-04-09

Abstract

The utility model discloses a reinforcing apparatus of tunnel preliminary bracing bow member, including stull, vertical joist and the stock of encorbelmenting, the stull is equipped with a plurality of, along left and right pilot tunnel length direction interval predetermined distance transversely set up in the upper and lower step connecting plate department of left and right pilot tunnel, the stull both ends respectively with the welding of bow member steel sheet, vertical joist is located stull both ends below and welds with the stull, forms the support to the stull, vertical joist below is provided with a plurality of stocks of encorbelmenting along the length direction interval predetermined distance of left and right pilot tunnel, the stock one end of encorbelmenting inserts the country rock, and the other end stretches out the country rock and forms the support to vertical joist. The utility model discloses utilize the stull to carry out convergence processing to supporting the bow member, the deformation takes place for the supporting bow member of prevention both sides, solves the problem that tunnel top highway load leads to supporting the bow member to seriously warp, and the stull below sets up vertical joist, and vertical joist below sets up the stock of encorbelmenting, effectively solves the stull and welds not jail, the problem of gliding easily.

Description

Tunnel preliminary bracing bow member reinforcing apparatus

Technical Field

The utility model belongs to the technical field of tunnel construction equipment, concretely relates to tunnel preliminary bracing bow member reinforcing apparatus.

Background

The double-side-wall pit guiding method is a tunnel excavation mode, and the principle is that two middle partition walls are utilized to divide the whole tunnel large section into a left small section, a middle small section and a right small section for construction, a left pilot tunnel and a right pilot tunnel move first, and the middle section is followed by the middle section; after the primary support inverted arch is looped, the temporary supports of the pilot tunnels on the two sides are removed to form a full section. The guide holes on the two sides are in inverted goose egg shapes, so that the vault is controlled to sink.

And (3) carrying out primary support after the left pilot tunnel and the right pilot tunnel are excavated, wherein in actual construction, a tunnel close to a city is inevitably arranged below an existing road, and under the condition that concrete is not dried through and a support arch is not shaped, the road repeatedly applies load to the tunnel, so that the support arch is seriously deformed. At present, for a primary support arch centering with serious deformation, a mode of arranging a support reinforcing arch in a pilot tunnel is generally adopted to correct the deformation, but the mode has the problems of complicated operation, large consumption of manpower and materials, increased cost and prolonged construction period.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tunnel preliminary bracing bow member reinforcing apparatus uses when the bow member is strutted in the initial stage setting, and prevention preliminary bracing bow member warp, solves prior art and sets up after the bow member warp and strut the operation of strengthening the arch loaded down with trivial details, the problem of wasting time and energy.

The technical scheme that the utility model discloses a, a reinforcing apparatus of tunnel preliminary bracing bow member for left and right pilot tunnel bow member is consolidated, bow member reinforcing apparatus includes the stull, and the stull is equipped with a plurality of, transversely sets up the upper and lower step connecting plate department at left and right pilot tunnel along left and right pilot tunnel length direction interval predetermined distance, and the stull both ends respectively with the welding of bow member steel sheet.

Furthermore, the transverse struts are made of I-shaped steel, and the spacing distance between every two adjacent transverse struts is 40-50 cm.

Furthermore, the device also comprises a longitudinal joist which is longitudinally arranged along the length direction of the left and right pilot tunnels, is positioned below the two ends of the cross brace and is welded with the cross brace.

Further, a plurality of cantilever anchor rods are arranged below the longitudinal joist at intervals of a preset distance along the length direction of the left pilot tunnel and the length direction of the right pilot tunnel, one end of each cantilever anchor rod is inserted into the surrounding rock and treated by grouting, and the other end of each cantilever anchor rod extends out of the surrounding rock to support the longitudinal joist.

Further, concrete layers are arranged on the surfaces of the surrounding rocks above and below the longitudinal joists, and the end parts of the cross braces and the longitudinal joists are covered by the concrete layers.

Furthermore, the cantilever anchor rods are made of steel bars, and the spacing distance between every two adjacent cantilever anchor rods is 20-25 cm.

Compared with the prior art, the beneficial effects of the utility model are that:

1) the utility model discloses a transversely set up the stull in the upper and lower step connecting plate department of left and right pilot tunnel, utilize the stull to carry out convergence treatment to the supporting bow member, reduce the stress influence that the country rock was applyed to the supporting bow member of prevention both sides takes place to deform, solve the problem that the highway load above the tunnel leads to the supporting bow member to seriously warp, thereby avoid setting up after the bow member warp and strut the operation of strengthening the arch loaded down with trivial details, the condition that wastes time and energy takes place;

2) the utility model discloses set up the vertical joist below the stull, set up the anchor rod of encorbelmenting below the vertical joist, the anchor rod of encorbelmenting forms the support to the vertical joist, and the vertical joist forms the support to the stull, effectively solves the stull and welds the problem that is not firm, easy gliding;

3) the cantilever anchor rods are treated by grouting, surrounding rocks above and below the longitudinal joist are covered by sprayed concrete, and the connection firmness of the cross braces, the longitudinal joist and the cantilever anchor rods is further enhanced;

4) reinforcing apparatus sets up the upper and lower step connecting plate department at left and right pilot tunnel, has both formed stable loop configuration with the cooperation of supporting the bow member, guarantees the below headroom again, satisfies driving requirements such as concrete tank car and loader.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic view of the effect of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings attached to the specification in order to facilitate better understanding by those skilled in the art.

Referring to fig. 1-2, a reinforcing device for a tunnel preliminary bracing arch is used for reinforcing left and right pilot tunnel preliminary bracing arches, and comprises a cross brace 1, a longitudinal joist 2 and a cantilever anchor rod 3.

The transverse supports 1 are transversely arranged at the upper and lower step connecting plates of the left pilot tunnel and the right pilot tunnel at intervals of a preset distance along the length direction of the left pilot tunnel and the right pilot tunnel, two ends of the transverse supports 1 are respectively welded with arch steel plates, convergence treatment is carried out on the supporting arch, the stress influence of surrounding rocks on the supporting arch is reduced, and therefore the supporting arch at two sides is prevented from deforming; specifically, in order to ensure the reinforcing effect of the wale 1 and reduce the material cost, the wale 1 adopts I20b I-steel, and the interval distance between adjacent wales 1 is 40-50 cm.

Vertical joist 2 is along the vertical setting of length direction of left and right pilot tunnel, is located the 1 both ends below of stull and welds with stull 1, forms to support stull 1, strengthens stull 1's connection steadiness, and vertical joist 2 below is provided with a plurality of stock 3 of encorbelmenting along the length direction interval predetermined distance of left and right pilot tunnel, 3 one end of the stock of encorbelmenting are inserted the country rock to adopt the slip casting to handle, make stock 3 and country rock fixed connection of encorbelmenting, the stock 3 other end of encorbelmenting stretches out the country rock and forms the support to vertical joist 2, and vertical joist 2 forms the support to stull 1, effectively solves the problem that stull 1 welds not jail, easy gliding.

In the embodiment, the cantilever anchor rods 3 are made of steel bars, and in order to enhance the supporting effect of the cantilever anchor rods 3, the interval distance between every two adjacent cantilever anchor rods 3 is 20-25 cm.

Further, the country rock surface of vertical joist 2 top and below is equipped with

concrete layer

4, 1 tip of stull and vertical joist 2 are covered on concrete layer 4 to the distance of concrete layer 4 top and bottom edge to vertical joist 2 is not less than 10cm, can consolidate stull 1 and bow member steel sheet, stull 1 and vertical joist 2, vertical joist 2 and the fastness of being connected between the stock of encorbelmenting 3.

The utility model provides a tunnel preliminary bracing bow member reinforcing apparatus sets up before the bow member warp, effectively reduces the stress influence of tunnel top highway repeated load to the formation of strutting the bow member, prevents to strut the bow member and warp, solves prior art and struts to set up after the bow member warp and strut the operation of strengthening the arch loaded down with trivial details, consumes manpower and materials, incremental cost and extension period's problem.

The embodiments described above are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Claims

1. The utility model provides a reinforcing apparatus of tunnel preliminary bracing bow member for left and right pilot tunnel bow member is consolidated, its characterized in that: the arch centering reinforcing device comprises a cross brace (1), wherein the cross brace (1) is provided with a plurality of cross braces, the cross braces are transversely arranged at the upper and lower step connecting plates of the left and right pilot tunnels at intervals of a preset distance along the length direction of the left and right pilot tunnels, and two ends of each cross brace (1) are respectively welded with an arch centering steel plate.

2. The reinforcing apparatus for a preliminary tunnel supporting arch according to claim 1, wherein: the transverse struts (1) are made of I-shaped steel, and the spacing distance between every two adjacent transverse struts (1) is 40-50 cm.

3. The reinforcing apparatus for a preliminary tunnel supporting arch according to claim 1, wherein: the novel steel wire rope guide rail is characterized by further comprising a longitudinal joist (2), wherein the longitudinal joist (2) is longitudinally arranged along the length direction of the left guide hole and the length direction of the right guide hole, is positioned below two ends of the cross support (1) and is welded with the cross support (1).

4. A reinforcing apparatus for a preliminary tunnel supporting arch according to claim 3, wherein: vertical joist (2) below is provided with a plurality of stock (3) of encorbelmenting along the length direction interval predetermined distance of left and right pilot tunnel, the country rock is inserted to stock (3) one end of encorbelmenting to adopt the slip casting to handle, the stock (3) other end of encorbelmenting stretches out the country rock and forms the support to vertical joist (2).

5. The reinforcing apparatus for a preliminary tunnel supporting arch according to claim 4, wherein: the surface of the surrounding rock above and below the longitudinal joist (2) is provided with a concrete layer (4), and the end part of the cross brace (1) and the longitudinal joist (2) are covered by the concrete layer (4).

6. The reinforcing apparatus for a preliminary tunnel supporting arch according to claim 4, wherein: the cantilever anchor rods (3) are made of steel bars, and the spacing distance between every two adjacent cantilever anchor rods (3) is 20-25 cm.