CN111441790A - Prefabricated lining of city gate-shaped tunnel and construction method of lining of city gate-shaped tunnel - Google Patents

Abstract

The invention relates to an assembled lining for a city gate-shaped tunnel, comprising at least one lining unit whose shape is adapted to the city gate-shaped tunnel, and the lining unit is assembled and formed by a plurality of prefabricated reinforced concrete segments. The prefabricated lining of the city gate-shaped tunnel is formed by prefabricating reinforced concrete segments outside the tunnel and then assembling them inside the tunnel. There is no need to bind and weld reinforced mesh sheets inside the tunnel. The assembly process is simple and efficient. It can not only effectively improve the construction efficiency, but also effectively reduce the impact on the health of construction workers during the construction process. The invention also relates to a construction method for the lining of a city gate-shaped tunnel.

Description

Prefabricated lining of city gate-shaped tunnel and construction method of lining of city gate-shaped tunnel

technical field

The invention relates to the technical field of water conservancy engineering construction, in particular to an assembled lining for a city gate-shaped tunnel and a construction method for the lining of a city gate-shaped tunnel.

Background technique

Shing Mun-shaped tunnels are the most common type of hydraulic tunnels. The construction speed of the tunnel lining has a great impact on the progress and safety of the project. At present, the lining of the tunnel is usually formed by cast-in-place. The specific steps are: first tie the steel mesh near the inner wall of the tunnel, and then move the steel formwork trolley to the A predetermined position is used to support the steel mesh, and then concrete is poured to the position of the steel mesh. After the concrete reaches the strength of the formwork removal, the steel form trolley can be removed before the next stage of pouring.

The most important factor restricting the construction speed of lining is the binding of steel mesh in the hole. At present, the binding and welding of the steel mesh for the tunnel lining are carried out in the tunnel. Due to the narrow space in the tunnel and the limited construction work area, the binding efficiency of the steel mesh is extremely low; welding is required during the binding process of the steel mesh. The smoke, dust and harmful gases dissipated slowly in the tunnel, which will seriously endanger the health of the on-site workers; in addition, the steel formwork trolley needs to wait for the concrete to reach the formwork strength before proceeding to the next stage of pouring, and the formwork utilization rate is low.

Therefore, how to effectively improve the construction efficiency of tunnel lining and reduce the impact on the health of construction workers is a technical problem that those skilled in the art need to solve urgently.

SUMMARY OF THE INVENTION

One of the objectives of the present invention is to provide an assembled lining for a city gate-shaped tunnel, so as to effectively improve the construction efficiency of the tunnel lining and reduce the impact on the health of construction workers during the construction process.

Another object of the present invention is to provide a construction method for the lining of a city gate-shaped tunnel.

In order to achieve the above object, the present invention provides a city gate-shaped tunnel assembled lining, comprising at least one lining unit whose shape is adapted to the city gate-shaped tunnel, and the lining unit is assembled from a plurality of prefabricated reinforced concrete segments.

Preferably, the prefabricated reinforced concrete segment at least includes:

A bottom block for being arranged at the bottom of the city gate-shaped tunnel;

side wall blocks symmetrically assembled on the left and right sides of the bottom block;

The top block is adapted to the shape of the top of the city gate-shaped tunnel, and the left and right sides of the top block are respectively assembled on the top ends of the two side wall blocks.

Preferably, the side wall block includes a side wall block body and a foot block, the foot block includes a bottom block connecting piece and a lower end side wall connecting piece perpendicular to the bottom block connecting piece, wherein,

The foot block is located at the right-angle bend formed by the bottom of the city gate-shaped tunnel and the side wall, and the bottom block connecting piece is assembled and connected with the bottom block, and the lower end side wall connecting piece is connected with the side wall. The lower end of the block body is assembled and connected.

Preferably, the top block includes a top block body and shoulder blocks symmetrically distributed at both ends of the top block body, the shoulder blocks include an upper end side wall connecting piece and a top block connecting piece connected to the upper end side wall connecting piece ,in,

The shoulder block is located at the bend formed by the side wall and the top of the city gate-shaped tunnel, and the upper end side wall connecting piece is assembled and connected to the upper end of the side wall block body, and the top block connecting piece is connected to the upper end of the side wall block body. The top block body is assembled and connected.

Preferably, the docking position of the bottom block and the bottom block connecting piece, the docking position of the side wall block body and the lower end side wall connecting piece, the side wall block body and the upper end side wall connecting piece The docking position of the top block body and the top block connecting piece form an inclined butt joint, and the two components that form the inclined butt joint pass through bolts perpendicular to the inclined butt joint. Assembly connection.

Preferably, the butting position of the bottom block and the bottom block connecting piece, the butting position of the side wall block body and the upper side wall connecting piece, and the butting position of the top block body and the top block connecting piece All positions form inclined butt joints, and the two components forming the inclined butt joints are assembled and connected by bolts perpendicular to the inclined butt joints; the side wall block body and the lower end side wall connecting piece are connected. The butt joints form a horizontal butt seam, and the two parts forming said horizontal butt seam are connected by a plug fitting assembly.

Preferably, the angle between the inclined butt seam and the horizontal plane is 45°.

Preferably, the top block body and the left and right two top block connecting pieces form two left-right symmetrical inclined butt joints, and the distance between the bottom ends of the two inclined butt joints is smaller than that between the top ends. The distance between the top block body and the top block connecting piece is supported by the top block connecting piece after the top block body is inserted into the space between the two top block connecting pieces.

The construction method for the lining of the gate-shaped tunnel disclosed in the present invention adopts the gate-shaped tunnel lining disclosed in any one of the above, and the construction method for the gate-shaped tunnel lining comprises the steps:

1) assembling the prefabricated reinforced concrete segments inside the city gate-shaped tunnel to form a lining unit which is adapted to the shape of the city-gate-shaped tunnel and covers the city-gate-shaped tunnel in the axial direction, A grouting gap is reserved between the top and side surfaces of the lining unit and the inner wall of the tunnel; or, the prefabricated reinforced concrete segments are assembled inside the city gate-shaped tunnel to form multiple A lining unit adapted to the shape of a gate-shaped tunnel, a plurality of the lining units are spliced in the axial direction to cover the gate-shaped tunnel in the axial direction, and the top and side of the lining unit are connected with the inner wall of the tunnel Reserve grouting gaps between;

2) The construction of the lining of the gate-shaped tunnel is completed by pouring the slurry into the grouting gap.

Preferably, the grouting gap is 90mm˜110mm.

Preferably, the grouting gap is 100mm.

Preferably, the axial length of any one of the lining units is 2m-4m.

It can be seen from the above technical solutions that the lining of the city gate tunnel disclosed in the present invention includes one or more lining units, and each lining unit is formed by assembling a plurality of prefabricated reinforced concrete segments;

According to the shape of the gate-shaped tunnel, the entire lining is divided into one or more lining units in the axial direction of the gate-shaped tunnel, and then each lining unit is divided into multiple segments for prefabrication. The prefabrication process is usually as follows: It is carried out in the reinforced concrete segment processing factory outside the tunnel. The prefabricated multiple reinforced concrete segments are assembled in the gate-shaped tunnel to form a lining unit, and then grouted to complete the construction of the gate-shaped tunnel.

It can be seen that the prefabricated lining of the city gate-shaped tunnel disclosed in this case is formed by prefabricating reinforced concrete segments outside the tunnel and then assembling them inside the tunnel. The process is simple and efficient, which can not only effectively improve construction efficiency, but also effectively reduce the impact on the health of construction workers during the construction process.

In the lining construction method of the city gate-shaped tunnel disclosed in the present invention, the above-mentioned city gate-shaped tunnel assembled lining is adopted, and the top and side of the lining unit formed by assembling prefabricated reinforced concrete segments in the city gate hole are connected to the inner wall of the tunnel. A grouting gap is reserved between them; then the slurry is poured into the grouting gap, that is, the construction of the lining of the gate-shaped tunnel is completed. It can be seen that the construction process of this construction method is simple and efficient, and the impact on the health of the construction workers is effectively reduced.

Description of drawings

1 is a schematic front view of the assembled lining unit disclosed in the embodiment of the present invention;

Fig. 2 is the assembly schematic diagram of the bottom block and the foot block;

Fig. 3 is the assembly schematic diagram of side wall block body and foot block;

Fig. 4 is the assembly schematic diagram of shoulder block and side wall block body;

FIG. 5 is a schematic view of the assembly of the top block body and the shoulder block.

Among them, 1 is the bottom block, 2 is the foot block, 3 is the side wall block body, 4 is the shoulder block, and 5 is the top block body.

Detailed ways

One of the cores of the present invention is to provide an assembled lining for a city gate-shaped tunnel, so as to effectively improve the construction efficiency of the tunnel lining and reduce the impact on the health of construction workers during the construction process.

Another core of the present invention is to provide a method for lining a city gate-shaped tunnel.

Please refer to FIG. 1 to FIG. 5 , an assembled lining for a gate-shaped tunnel disclosed in an embodiment, the lining includes at least one lining unit whose shape is adapted to the shape of the gate-shaped tunnel, and the lining unit is composed of a plurality of prefabricated steel bars Concrete segment assembly is formed.

Before the actual prefabrication of the lining, it is necessary to design the lining into a lining unit of 2 to 4 meters along the axial direction of the gate-shaped tunnel according to the design and excavation size of the gate-shaped tunnel, as well as the convenience of manufacturing and transportation. When the axial length of the Shingmen-shaped tunnel is 2 to 4 meters, only one lining unit can be designed. When the axial length of the Shingmen-shaped tunnel is greater than 4 meters, multiple lining units should be set up, and through multiple lining units The axial direction of the shaped tunnel is sequentially arranged to form the entire lining.

It can be seen from the above embodiments that the lining of the city gate tunnel disclosed in the present invention includes one or more lining units, and each lining unit is formed by assembling a plurality of prefabricated reinforced concrete segments;

According to the shape of the gate-shaped tunnel, the entire lining is divided into one or more lining units in the axial direction of the gate-shaped tunnel, and then each lining unit is divided into multiple segments for prefabrication. The prefabrication process is usually as follows: It is carried out in the reinforced concrete segment processing factory outside the tunnel. The prefabricated multiple reinforced concrete segments are assembled in the gate-shaped tunnel to form a lining unit, and then grouted to complete the construction of the gate-shaped tunnel.

It can be seen that the prefabricated lining of the city gate-shaped tunnel disclosed in the above embodiment is formed by prefabricating reinforced concrete segments outside the hole and then assembling them in the hole, and there is no need to bind and weld the reinforced mesh in the hole. , the assembly process is simple and efficient, which can not only effectively improve the construction efficiency, but also effectively reduce the impact on the health of the construction workers during the construction process.

The number, shape and position of the precast concrete segments that make up each lining unit need to be designed according to the basic requirements of convenient transportation and quick installation of the gate-shaped tunnel, and combined with the stress characteristics of the gate-shaped tunnel, for example, in some embodiments , the precast concrete segment includes at least a bottom block 1, a side wall block and a top block, the bottom block 1 is used to be arranged at the bottom of the city gate-shaped tunnel to form the ground in the city gate-shaped tunnel, and the side wall block includes two , the two side wall blocks are symmetrically assembled on the left and right sides of the bottom block 1, the side wall blocks are used to form the side walls of the gate-shaped tunnel, the shape of the top block is adapted to the shape of the top of the gate-shaped tunnel, and the top The left and right sides of the block are respectively assembled on the top of the two side wall blocks, and the top block is used to form the top surface of the gate-shaped tunnel.

In another embodiment, when the height of the gate-shaped tunnel is not greater than 5m, the following method can be used: the side wall block is further divided into a side wall block body 3 and a foot block 2, and the top block is further divided into a top block body 5 and the shoulder block 4, the foot block 2 is specifically L-shaped, as shown in Figures 1 to 5, the foot block 2 includes a bottom block connecting piece and a lower end side wall connecting piece perpendicular to the bottom block connecting piece, and the foot block 2 It is located at the right-angle bend formed by the bottom of the city gate-shaped tunnel and the side wall, the bottom block connecting piece is assembled and connected with the bottom block 1, and the lower end side wall connecting piece is assembled and connected with the lower end of the side wall block body 3;

The shoulder block 4 includes an upper end side wall connecting piece and a top block connecting piece connected with the upper end side wall connecting piece. The side wall connecting piece is a plane shape, and the top block connecting piece is in an arc shape adapted to the top of the city gate-shaped tunnel. 4 is located at the bend formed by the side wall and the top of the city gate-shaped tunnel, and the upper end side wall connecting piece is assembled and connected to the upper end of the side wall body, and the top block connecting piece is assembled and connected to the top block body 5 .

The assembly sequence of this kind of lining unit can be carried out with reference to Fig. 2 to Fig. 5. After placing the foot block 2, the bottom block 1 is assembled, then the side wall block body 3 is assembled, and then the shoulder block 4 is assembled, and finally the top block is carried out. Assembly of the block body 5 .

In one embodiment, the docking position of the bottom block 1 and the bottom block connecting piece, the docking position of the side wall block body 3 and the lower end side wall connecting piece, the butting position of the side wall block body 3 and the upper end side wall connecting piece, and The butt joints between the top block body 5 and the top block connecting piece all form inclined butt joints, and the two components that form the inclined butt joints are assembled and connected by bolts perpendicular to the inclined butt joints. Further, please refer to Figure 5, the top The block body 5 and the left and right top block connecting pieces form two left-right symmetrical inclined butt joints, and the distance between the bottom ends of the two inclined butt joints is smaller than the distance between the top ends, so as to insert two left and right into the top block body 5. The space between the top block connecting pieces is supported by the top block connecting piece, that is to say, the top block body 5 can finally be inserted into the space between the two top block connecting pieces in the axial direction, and can be inserted into the space between the two top block connecting pieces in the axial direction. Under the supporting action of the connecting piece, it remains stable, so as to facilitate the installation of bolts between the top block body 5 and the top block connecting piece.

It can be understood by those skilled in the art that, in order to maintain the reliability of installation, a plurality of the above-mentioned bolts may be arranged in any inclined butt joint along the axial direction of the city gate-type tunnel.

In another embodiment, the butting position of the bottom block 1 and the bottom block connecting piece, the butting position of the side wall block body 3 and the upper end side wall connecting piece, and the butting position of the top block body 5 and the top block connecting piece are all inclined. butt joints, and the two components that form the inclined butt joints are assembled and connected by bolts perpendicular to the inclined butt joints; the butt joint positions of the side wall block body 3 and the lower end side wall connecting piece form a horizontal butt joint, and form a horizontal joint. The two parts of the butt joint are connected by means of a connector assembly.

Please refer to Fig. 1 to Fig. 5, the butting position of the side wall block body 3 and the lower end side wall connecting piece forms a horizontal butt joint to ensure the stability of the force and avoid the prefabricated reinforced concrete segments of the side wall block body 3 and above. Sliding, in order to realize the butt joint between the side wall block body 3 and the lower end side wall connecting piece, one of the side wall block body 3 and the foot block 2 should be prefabricated or installed with a plunger, and the other one should be prefabricated or installed. A slot that is adapted to the insertion rod is installed to realize the plug-in assembly between the two.

Of course, if the height of the gate-shaped tunnel is greater than 5 meters, the bottom block 1 and the side wall block body 3 can be further disassembled to facilitate prefabrication, transportation and installation.

The purpose of the inclined butt joint is to facilitate bolt installation, so the angles of any two inclined butt joints in the above embodiment may be equal or unequal. In a recommended embodiment, the inclination angle of the inclined butt joint is 45°.

In addition, it should be noted that in this article, the axial direction of the gate-shaped tunnel is taken as the front-rear direction, so the side wall of the gate-shaped tunnel is the left-right direction.

The construction method for the lining of the gate-shaped tunnel disclosed in the present invention adopts the gate-shaped tunnel lining disclosed in any one of the above-mentioned embodiments, and includes the steps:

1) Assemble the prefabricated reinforced concrete segments inside the gate-shaped tunnel to form a lining unit that fits the shape of the gate-shaped tunnel and covers the gate-shaped tunnel in the axial direction, and makes the top and side of the lining unit meet the A grouting gap is reserved between the inner walls of the gate-shaped tunnel; alternatively, the prefabricated reinforced concrete segments are assembled inside the gate-shaped tunnel to form a plurality of lining units that are adapted to the shape of the gate-shaped tunnel, and the multiple lining units are axially aligned. The upper splicing is used to cover the city gate-shaped tunnel in the axial direction, and a grouting gap is reserved between the top and side of the lining unit and the inner wall of the city gate-shaped tunnel, and a plurality of lining units are also connected by connectors or plugs. The parts are connected, or there may be no connection between multiple lining units;

2) Pour slurry into the grouting gap, that is, complete the construction of the lining of the city gate-shaped tunnel.

When pouring the slurry, it is preferred to use bean gravel to fill the grouting, and the grouting gap is between 90 and 110 mm, preferably 100 mm, to ensure the uniformity of the force between the lining and the inner wall of the gate-shaped tunnel.

In the construction method for the lining of the city gate hole-shaped tunnel in the above-mentioned embodiment, the above-mentioned city gate hole-shaped tunnel lining is adopted, and the top and side surfaces of the lining unit formed by assembling the prefabricated reinforced concrete segments and the inner wall of the tunnel are pre-prepared in the city gate hole. Leave a grouting gap; then pour the slurry into the grouting gap to complete the construction of the gate-shaped tunnel lining. It can be seen that this construction method is simple and efficient, and can effectively reduce the impact on the health of the construction workers during the construction process. Great promotion and application value.

The prefabricated lining of the city gate-shaped tunnel and the construction method of the lining of the city gate-shaped tunnel provided by the present invention are described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. An assembled lining for a city gate-shaped tunnel, characterized in that it comprises at least one lining unit whose shape is adapted to the city gate-shaped tunnel, and the lining unit is assembled from a plurality of prefabricated reinforced concrete segments. 2. The prefabricated lining for a city gate-shaped tunnel according to claim 1, wherein the prefabricated reinforced concrete segment at least comprises: A bottom block (1) for being arranged at the bottom of the city gate-shaped tunnel; side wall blocks symmetrically assembled on the left and right sides of the bottom block (1); The top block is adapted to the shape of the top of the city gate-shaped tunnel, and the left and right sides of the top block are respectively assembled on the top ends of the two side wall blocks. 3. The prefabricated lining for a city gate-shaped tunnel according to claim 2, wherein the side wall block comprises a side wall block body (3) and a foot block (2), and the foot block (2) comprises a bottom A block connecting piece and a lower end side wall connecting piece perpendicular to the bottom block connecting piece, wherein, The foot block (2) is located at the right-angle bend formed by the bottom of the city gate-shaped tunnel and the side wall, and the bottom block connecting piece is assembled and connected to the bottom block (1), and the lower end side wall is connected The sheet is assembled and connected with the lower end of the side wall block body (3). 4. The prefabricated lining for a city gate-shaped tunnel according to claim 3, wherein the top block comprises a top block body (5) and shoulder blocks (4) symmetrically distributed at both ends of the top block body (5). ), the shoulder block (4) comprises an upper end side wall connecting piece and a top block connecting piece connected with the upper end side wall connecting piece, wherein, The shoulder block (4) is located at the bend formed by the side wall and the top of the city gate-shaped tunnel, and the upper end side wall connecting piece is assembled and connected to the upper end of the side wall block body (3), so The top block connecting piece is assembled and connected with the top block body (5). 5. The prefabricated lining for a city gate-shaped tunnel according to claim 4, characterized in that the butt joint position of the bottom block (1) and the bottom block connecting piece, the side wall block body (3) and the The docking position of the lower end side wall connecting piece, the butting position of the side wall block body (3) and the upper end side wall connecting piece, and the butting position of the top block body (5) and the top block connecting piece are all An oblique butt joint is formed, and the two components forming the oblique butt joint are both assembled and connected by bolts perpendicular to the oblique butt joint. 6. The prefabricated lining for a city gate-shaped tunnel according to claim 4, characterized in that the butting position of the bottom block (1) and the bottom block connecting piece, the side wall block body (3) and the The butting position of the upper end side wall connecting piece and the butting position of the top block body (5) and the top block connecting piece all form inclined butt joints, and the two components forming the inclined butt joints pass through vertical joints. The bolts are assembled and connected at the inclined butt joints; the docking position of the side wall block body (3) and the lower end side wall connecting piece forms a horizontal butt joint, and forms two components of the horizontal butt joint The connection is made by means of a plug-in connector. 7 . The prefabricated lining for a city gate-shaped tunnel according to claim 5 or 6 , wherein the angle between the inclined butt joint and the horizontal plane is 45°. 8 . 8. The prefabricated lining for a city gate-shaped tunnel according to claim 5 or 6, wherein the top block body (5) and the left and right two top block connecting pieces form two left-right symmetrical inclinations butt joints, and the distance between the bottom ends of the two inclined butt joints is smaller than the distance between the top ends, so that after the top block body (5) is inserted into the space between the two top block connecting pieces supported by the top block connecting piece. 9. A construction method for a gate-shaped tunnel lining, adopting the gate-shaped tunnel lining according to any one of claims 1-8, characterized in that, comprising the steps: 1) assembling the prefabricated reinforced concrete segments inside the city gate-shaped tunnel to form a lining unit which is adapted to the shape of the city-gate-shaped tunnel and covers the city-gate-shaped tunnel in the axial direction, A grouting gap is reserved between the top and side of the lining unit and the inner wall of the city gate-shaped tunnel; or, the prefabricated reinforced concrete segments are assembled inside the city gate-shaped tunnel to form a plurality of A lining unit adapted to the shape of the city gate hole-shaped tunnel, a plurality of the lining units are spliced in the axial direction to cover the city gate hole-shaped tunnel in the axial direction, and the top and side of the lining unit are connected to the A grouting gap is reserved between the inner walls of the gate-shaped tunnel; 2) The construction of the lining of the gate-shaped tunnel is completed by pouring the slurry into the grouting gap. 10 . The method for lining a city gate-shaped tunnel according to claim 9 , wherein the grouting gap is 90 mm to 110 mm. 11 .

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