Device capable of adjusting and fixing positions of steel bars in tunnel lining

Abstract

The utility model discloses a device capable of adjusting and fixing the position of a reinforcing steel bar in a tunnel lining, which comprises an outer screw cap, an outer screw rod, a turn buckle, an inner screw rod and a base, and a length-adjustable device is formed by connecting the outer screw cap, the outer screw rod, the turn buckle, the inner screw rod and the base according to the screw rod principle. The device is convenient to operate, the detection cost is effectively reduced, the working efficiency is improved, and compared with a traditional device, the radial position of the lining double-layer stressed steel bar can be controlled for the first time.

Description

Technical Field

[0001] The utility model belongs to the field of tunnel engineering construction, and in particular relates to a device capable of adjusting and fixing the position of steel bars in a tunnel lining. Background Art

[0002] With the continuous optimization of design standards and construction processes in my country's highway industry, the requirements for engineering construction are becoming more and more stringent. Highway tunnels are an important part of expressways, and the construction quality of highway tunnels is directly related to the safety of life and property of people passing through the tunnel. In recent years, the problem of highway tunnel diseases in my country has become increasingly prominent. The emergence of diseases such as water leakage, lining annular cracks, longitudinal cracks, and tunnel eccentricity indirectly reflects the problems of construction control during tunnel construction. The position of steel bars in the tunnel lining directly affects the bearing capacity of the entire lining, which greatly affects the safe use of the tunnel. Therefore, effective control of the position of steel bars in the lining is of great significance to improving the support capacity of the tunnel structure.

[0003] At present, the main control measures for the position of steel bars in the lining are:

[0004] 1. Control the radial spacing between the two layers of steel mesh: According to the technical specifications for tunnel construction, the inner annular main reinforcement of the lining needs to be laid with a certain size of limiting steel bars and then a certain number of stirrups. By installing internal limiting steel bars and external stirrups, the spacing between the two rows of main reinforcement is basically the same.

[0005] 2. Control the longitudinal spacing of each row of steel bars: install equilateral angle steels longitudinally on the lining vault, left and right side walls, and left and right arch waists. Slot the angle steels according to the designed main reinforcement spacing, and embed the circumferential force-bearing main reinforcements in the grooves of the angle steels.

[0006] However, both methods have certain shortcomings:

[0007] During the construction process, the steel bar position needs to be close to the inner contour surface of the tunnel, and a certain concrete protective layer must be reserved. The concrete protective layer is usually 5 cm. The double-layer stress-bearing steel bar structure can fully exert the bearing capacity of the lining only at this position. However, during on-site construction, neither of these two methods can fully control the predetermined position of the double-layer steel mesh in the lining. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a device that can adjust and fix the position of steel bars in a tunnel lining. The utility model can effectively control the radial position of the double-layer steel mesh in the lining and replace the limiting steel bars and stirrups.

[0009] In order to achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions:

[0010] A device capable of adjusting and fixing the position of steel bars in a tunnel lining comprises an outer nut, an outer screw, a turnbuckle bolt, an inner screw and a base; the outer nut is threadedly connected to the top of the outer screw, the bottom thread of the outer screw is connected to the upper threaded opening of the turnbuckle bolt, the lower threaded opening of the turnbuckle bolt is threadedly connected to the top of the inner screw, and the base is fixedly connected to the bottom of the inner screw.

[0011] Further technology of the utility model:

[0012] Preferably, an outer buckle and an inner buckle are installed on the outer screw rod, and the inner and outer buckles are fixedly connected to the inner annular stress-bearing steel bars of the lining.

[0013] Preferably, after the outer nut is threadedly connected to the top of the outer screw, the extension and retraction length of the outer nut can be adjusted.

[0014] Preferably, the base includes a steel plate base and a rubber buffer layer connected up and down.

[0015] Preferably, the basket bolt has a power-assisting hole.

[0016] The beneficial effects of the utility model are:

[0017] The utility model optimizes the foundation structure, increases the contact between the pile foundation and the soil by adopting a spiral root foundation, utilizes the soil squeezing effect of the steel root key to compact the surrounding soil and the root effect of the steel root key, can fully mobilize the bearing capacity of the soil around the pile, improves the vertical bearing capacity, horizontal bearing capacity and pull-out resistance of the pile foundation, thereby having better economy, simple process, fast construction, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is the front view of the utility model after extension.

[0020] Figure 2 This is the front view of the utility model after contraction;

[0021] The symbols in the figure are: 1-external nut, 2-external screw, 2-1-external buckle, 2-2-internal buckle, 3-basket bolt, 3-1-power hole, 4-internal screw, 4-1-steel plate base, 4-2-rubber buffer layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be further described in detail below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model but not all. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1-2 This embodiment provides a device for adjusting and fixing the position of steel bars in a tunnel lining of the utility model, comprising an external nut 1, an external screw 2, a basket bolt 3, an internal screw and a base 4; the external nut 1 is threadedly connected to the top of the external screw 2, the bottom thread of the external screw 2 is connected to the upper threaded opening of the basket bolt 3, and the lower threaded opening of the basket bolt 3 is threadedly connected to the internal screw and the top of the base 4.

[0024] The outer nut 1 is connected to the top of the outer screw 2 and screwed to the bottom of the thread. After the outer buckle 2-1 is connected to the outer annular stress-bearing steel bars of the lining, the thickness of the protective layer can be adjusted by adjusting the connection length between the outer nut 1 and the top of the outer screw 2.

[0025] The bottom thread of the outer screw 2 is connected to the threaded opening of the basket bolt 3, the lower threaded opening of the basket bolt 3 is connected to the inner screw and the top thread of the base 4, the inner and outer buckles are connected to the lining annular double-layer stress-bearing steel bars, and the elongation and contraction of the device can be freely adjusted through the power-assisting hole.

[0026] The method for adjusting the position of the steel bars in the tunnel lining by the device of the utility model is as follows:

[0027] When the device of the utility model is in use, the outer nut is firstly connected with the top thread of the outer screw, the bottom thread of the outer screw is connected with the upper threaded opening of the basket bolt, and the lower threaded opening of the basket bolt is connected with the inner screw and the top thread of the base; after the connection is completed, each thread structure is screwed to the tightest state, at which time the device is completely in the shortest contracted state, and after the main reinforcement of the lining annular force reaches the approximate position, it is connected with the inner and outer buckles on the device, so that the device can be perpendicular to the initial support surface, and the base is supported on the surface of the waterproof board. At this time, the steel bars are all in close contact with the initial support surface due to the elasticity. After the device is installed, the lever is inserted into the power-assisting hole, and the basket bolt is adjusted to extend the device. The adjustment can be stopped when the steel bars reach the predetermined position; according to this step, it is installed from one side to the other side in sequence, and finally the steel bars are welded to the reserved steel bars of the invert.

[0028] Special note: The radial position of the double-layer stress-bearing steel bars in the lining has not been controlled. After the actual lining construction is completed, it is found that the steel bars at the arch waist of the tunnel are often completely close to the primary support surface. The designed 50cm thick lining often has a steel bar protection layer thickness of more than ten centimeters, and some are even more than twenty centimeters, which is far from meeting the regulatory requirements. Some traditional construction methods cannot solve this problem, because the primary support surface of the tunnel is uneven, so the depth that needs to be controlled at each point is inconsistent.

[0029] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A device capable of adjusting and fixing the position of steel bars in a tunnel lining, characterized in that: The invention comprises an external nut (1), an external screw (2), a turnbuckle bolt (3), an internal screw (4) and a base; the characteristics are that the external nut (1) is threadedly connected to the top of the external screw (2), the bottom thread of the external screw (2) is connected to the upper threaded opening of the turnbuckle bolt (3), the lower threaded opening of the turnbuckle bolt (3) is threadedly connected to the top of the internal screw (4), and the base is fixedly connected to the bottom of the internal screw (4).

2. A device for adjusting and fixing the position of steel bars in a tunnel lining according to claim 1, characterized in that: An outer buckle (2-1) and an inner buckle (2-2) are mounted on the outer screw rod (2), and the inner and outer buckles are fixedly connected to the inner annular stress-bearing steel bars of the lining.

3. The device for adjusting and fixing the position of steel bars in a tunnel lining according to claim 1, characterized in that: After the outer nut (1) is threadedly connected to the top of the outer screw rod (2), the extension and retraction length of the outer nut (1) can be adjusted.

4. The device for adjusting and fixing the position of steel bars in a tunnel lining according to claim 1, characterized in that: The base comprises a steel plate base (4-1) and a rubber buffer layer (4-2) connected up and down.

5. The device for adjusting and fixing the position of steel bars in a tunnel lining according to claim 1, characterized in that: The turnbuckle bolt (3) is provided with a power-assisting hole (3-1).

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