阅读说明：本技术 用于隧洞快速衬砌的装配式钢筋笼施工方法 (Fabricated reinforcement cage construction method for rapid tunnel lining ) 是由 张金良 曹国利 王美斋 董甲甲 张钧睿 吕小龙 霍鹤飞 蔡文勇 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种用于隧洞快速衬砌的装配式钢筋笼施工方法,1,根据隧洞开挖洞径,将隧洞衬砌设计成沿所述隧洞轴向2~4米为一个隧洞衬砌单元,每个隧洞衬砌单元均设计成由沿环向分割的底部砌块、左侧部砌块、右侧部砌块和顶部砌块衔接成环；2,在隧洞外预制底部砌块,绑扎左、右侧部砌块钢筋笼和顶部砌块钢筋笼；3,隧洞衬砌施工：铺设第一个隧洞衬砌单元的底部砌块；4,在底部砌块环向两侧安装左、右侧部砌块钢筋笼,环向受力钢筋搭接、焊接牢固；5,将顶部砌块钢筋笼的环向受力钢筋与相衔接的左、右侧部砌块钢筋笼的环向受力钢筋搭接、焊接牢固成环。本发明方法有效的提升了隧洞衬砌钢筋笼绑扎与焊接的效率,改善了洞内工作环境。(The invention discloses an assembly type reinforcement cage construction method for rapid tunnel lining, which comprises the steps of 1, designing tunnel lining into 2 ~ 4 meters along the axial direction of a tunnel as a tunnel lining unit according to the tunnel excavation diameter, wherein each tunnel lining unit is designed to be formed by connecting bottom building blocks, left side building blocks, right side building blocks and top building blocks which are divided along the circumferential direction into rings, 2, prefabricating bottom building blocks outside the tunnel, binding a left side building block reinforcement cage and a right side building block reinforcement cage with the top building block reinforcement cage, 3, performing tunnel lining construction, namely laying the bottom building blocks of a first tunnel lining unit, 4, installing the left side building block reinforcement cage and the right side building block reinforcement cage on the circumferential sides of the bottom building blocks, overlapping the circumferential stressed reinforcements, and firmly welding, and 5, overlapping the circumferential stressed reinforcements of the top building block reinforcement cage with the circumferential stressed reinforcements of the left side building block reinforcement cage and the right side building block reinforcement cage, and firmly welding to form rings.)

1. A construction method of an assembled reinforcement cage for rapid lining of a tunnel is characterized by comprising the following steps: the method comprises the following steps:

Step 1, designing a tunnel lining into a tunnel lining unit along the axial direction of the tunnel by 2 ~ 4 m according to the tunnel excavation diameter of the tunnel, wherein each tunnel lining unit is designed to be formed by connecting a bottom building block, a left side building block, a right side building block and a top building block which are annularly divided into rings;

step 2, prefabricating the bottom building block outside the tunnel, and binding a left side building block reinforcement cage, a right side building block reinforcement cage and a top building block reinforcement cage; the two ends of the annular stressed steel bar of the bottom building block extend out of the radial joint faces of the annular stressed steel bar of the bottom building block respectively and are used for being lapped with the annular stressed steel bars of the left and right side building block steel bar cages which are connected with each other, the annular joint faces of the bottom building blocks are provided with water stopping grooves for installing water stopping belts, and positioning pins are arranged in the bottom building blocks along the axial direction and are used for positioning the bottom building blocks and the tunnel lining units which are connected with each other; the left and right side part building block steel reinforcement cages and the top building block steel reinforcement cage are bound by annular stressed steel reinforcements and structural stirrups; the structural stirrup is of a U-shaped structure, and the opening of the structural stirrup of the U-shaped structure is arranged towards the direction of the next tunnel lining unit which is connected with the structural stirrup and is used for being lapped with the structural stirrup of the next tunnel lining unit which is connected with the structural stirrup; the two ends of the circumferential stressed steel bar of the top building block steel bar cage respectively extend out of the radial joint surfaces of the circumferential stressed steel bar and are used for being lapped with the circumferential stressed steel bars of the left and right side building block steel bar cages which are connected with each other;

Step 3, tunnel lining construction: firstly, laying a bottom building block of a first tunnel lining unit, wherein the bottom building block plays a role of supporting a left building block reinforcement cage and a right building block reinforcement cage on one hand, and is used as a traffic foundation for equipment transportation in the tunnel on the other hand;

Step 4, mounting left and right side block reinforcement cages on the two circumferential sides of the laid bottom block, overlapping the circumferential stress reinforcement of the bottom block with the circumferential stress reinforcement of the left and right side block reinforcement cages which are connected with each other, and firmly connecting the circumferential stress reinforcement and the circumferential stress reinforcement by binding or welding;

Step 5, the top block steel reinforcement cage is installed on the top of the tunnel in a pushing and lifting mode, the annular stress steel bars of the top block steel reinforcement cage are in lap joint with the annular stress steel bars of the left side block steel reinforcement cage and the right side block steel reinforcement cage which are connected with each other, and the top block steel reinforcement cage, the left side block steel reinforcement cage, the right side block steel reinforcement cage and the top block steel reinforcement cage of the first tunnel lining unit are firmly connected in a binding or welding mode, so that the bottom block, the left side block steel reinforcement cage, the right side;

Step 6, erecting a template, and pouring concrete to complete the integral lining structure of the first tunnel lining unit;

7, repeating the steps 3 to 6 to complete the integral lining structure of the second tunnel lining unit; before the template is erected in the step 6, the structural stirrups of the left and right side building block steel reinforcement cages and the top building block steel reinforcement cage of the first tunnel lining unit and the structural stirrups of the left and right side building block steel reinforcement cages and the top building block steel reinforcement cage of the second tunnel lining unit are correspondingly lapped, welded or bound firmly, and then the template is erected and concrete is poured;

and 8, repeating the step 7 to finish the integral lining construction of the whole tunnel.

2. the assembly type reinforcement cage construction method for rapid tunnel lining according to claim 1, wherein: when the diameter of the tunnel is more than 10 meters, the left side building block of the tunnel lining unit consists of a first left side building block and a second left side building block; the right side building block of tunnel lining unit comprises first right side building block and second right side building block.

3. the assembly type reinforcement cage construction method for the rapid tunnel lining is characterized in that the formwork consists of an arc-shaped reinforced concrete base formwork, a left side standard formwork, a right side standard formwork and a top sealing formwork, the axial length of the arc-shaped reinforced concrete base formwork, the axial length of the left side standard formwork, the axial length of the right side standard formwork and the axial length of the top sealing formwork are 2 ~ 4 m, a traffic platform for laying a track is arranged on the inner arc surface of the arc-shaped reinforced concrete base formwork, the left side standard formwork, the right side standard formwork and the top sealing formwork are all of steel framework structures, namely arc-shaped steel plates and longitudinal and transverse rib plates welded on the inner arc surfaces of the arc-shaped steel plates and used for improving the strength, and the arc-shaped reinforced concrete base formwork and the left and right side standard formworks as well as the left and right side standard formworks and the top sealing formwork are connected through high-strength bolts respectively.

Technical Field

the invention relates to a construction method of a cast-in-place concrete lining of a tunnel, in particular to a design method of an assembled reinforcement cage in the tunnel lining.

Background

The construction speed of tunnel lining has great influence on the progress and safety of the project, and the construction speed of lining is limited by binding of a reinforcement cage in the tunnel. At present, the binding and welding of a reinforcement cage of a tunnel lining are mostly carried out in a tunnel, and the binding and welding efficiency of the reinforcement cage is very low due to the influence of space and illumination. In addition, dust and smoke generated in the process of binding and welding a large number of steel bars are difficult to dissipate in the holes, and the health of field workers is seriously endangered.

Disclosure of Invention

In order to achieve the purpose, the invention adopts the following technical scheme:

The invention aims to provide a construction method of an assembled reinforcement cage for rapid lining of a tunnel.

the invention relates to a construction method of an assembled reinforcement cage for rapid lining of a tunnel, which comprises the following steps:

step 1, designing a tunnel lining into a tunnel lining unit along the axial direction of the tunnel by 2 ~ 4 m according to the tunnel excavation diameter of the tunnel, wherein each tunnel lining unit is designed to be formed by connecting a bottom building block, a left side building block, a right side building block and a top building block which are annularly divided into rings;

step 2, prefabricating the bottom building block outside the tunnel, and binding a left side building block reinforcement cage, a right side building block reinforcement cage and a top building block reinforcement cage; the two ends of the annular stressed steel bar of the bottom building block extend out of the radial joint faces of the annular stressed steel bar of the bottom building block respectively and are used for being lapped with the annular stressed steel bars of the left and right side building block steel bar cages which are connected with each other, the annular joint faces of the bottom building blocks are provided with water stopping grooves for installing water stopping belts, and positioning pins are arranged in the bottom building blocks along the axial direction and are used for positioning the bottom building blocks and the tunnel lining units which are connected with each other; the left and right side part building block steel reinforcement cages and the top building block steel reinforcement cage are bound by annular stressed steel reinforcements and structural stirrups; the structural stirrup is of a U-shaped structure, and the opening of the structural stirrup of the U-shaped structure is arranged towards the direction of the next tunnel lining unit which is connected with the structural stirrup and is used for being lapped with the structural stirrup of the next tunnel lining unit which is connected with the structural stirrup; the two ends of the circumferential stressed steel bar of the top building block steel bar cage respectively extend out of the radial joint surfaces of the circumferential stressed steel bar and are used for being lapped with the circumferential stressed steel bars of the left and right side building block steel bar cages which are connected with each other;

Step 3, tunnel lining construction: firstly, laying a bottom building block of a first tunnel lining unit, wherein the bottom building block plays a role of supporting a left building block reinforcement cage and a right building block reinforcement cage on one hand, and is used as a traffic foundation for equipment transportation in the tunnel on the other hand;

Step 4, mounting left and right side block reinforcement cages on the two circumferential sides of the laid bottom block, overlapping the circumferential stress reinforcement of the bottom block with the circumferential stress reinforcement of the left and right side block reinforcement cages which are connected with each other, and firmly connecting the circumferential stress reinforcement and the circumferential stress reinforcement by binding or welding;

step 5, the top block steel reinforcement cage is installed on the top of the tunnel in a pushing and lifting mode, the annular stress steel bars of the top block steel reinforcement cage are in lap joint with the annular stress steel bars of the left side block steel reinforcement cage and the right side block steel reinforcement cage which are connected with each other, and the top block steel reinforcement cage, the left side block steel reinforcement cage, the right side block steel reinforcement cage and the top block steel reinforcement cage of the first tunnel lining unit are firmly connected in a binding or welding mode, so that the bottom block, the left side block steel reinforcement cage, the right side;

Step 6, erecting a template, and pouring concrete to complete the integral lining structure of the first tunnel lining unit;

7, repeating the steps 3 to 6 to complete the integral lining structure of the second tunnel lining unit; before the template is erected in the step 6, the structural stirrups of the left and right side building block steel reinforcement cages and the top building block steel reinforcement cage of the first tunnel lining unit and the structural stirrups of the left and right side building block steel reinforcement cages and the top building block steel reinforcement cage of the second tunnel lining unit are correspondingly lapped, welded or bound firmly, and then the template is erected and concrete is poured;

And 8, repeating the step 7 to finish the integral lining construction of the whole tunnel.

When the diameter of the tunnel is more than 10 meters, the left side building block of the tunnel lining unit consists of a first left side building block and a second left side building block; the right side building block of tunnel lining unit comprises first right side building block and second right side building block.

the template comprises an arc-shaped reinforced concrete base template, a left side standard template, a right side standard template and a top sealing template, wherein the length of the arc-shaped reinforced concrete base template, the length of the left side standard template, the length of the right side standard template and the length of the top sealing template along the axial direction are 2 ~ 4 m, a traffic platform for laying a track is arranged on the inner arc surface of the arc-shaped reinforced concrete base template, the left side standard template, the right side standard template and the top sealing template are all of steel framework structures, namely, the traffic platform is composed of arc-shaped steel plates and longitudinal and transverse rib plates which are welded on the inner arc surfaces of the arc-shaped steel plates and used for improving the strength, and the arc-shaped reinforced concrete base template is connected with the left side standard template and the right side standard template and the left side standard template and the right side standard template are connected.

The method effectively improves the binding and welding efficiency of the tunnel lining reinforcement cage, improves the working environment in the tunnel, considers the traffic in the tunnel in the construction process, effectively reduces the construction interference and greatly improves the lining efficiency of the whole tunnel.

Drawings

Figure 1 is a schematic structural view of a tunnel lining unit implemented according to the present invention.

FIG. 2 is a schematic diagram of the lap joint of the bottom block hoop stress steel bar and the right block steel bar cage.

FIG. 3 is a schematic diagram of the right side block rebar cage of the present invention overlapping the top rebar cage.

fig. 4 is a schematic view of the erection module of the present invention in which concrete is poured.

Fig. 5 is a schematic view of an arc-shaped reinforced concrete base form according to the present invention.

Fig. 6 is a schematic view of the left side standard template (or the right side standard template) according to the present invention.

FIG. 7 is a schematic view of the capping template of the present invention.

the specific implementation mode is as follows:

as shown in fig. 1 ~ and fig. 3, the construction method of the fabricated reinforcement cage for rapid tunnel lining according to the present invention comprises the following steps:

step 1, according to the diameter of a tunnel to be excavated, designing a tunnel lining into a tunnel lining unit along 3 meters of the axial direction of the tunnel, so as to be convenient for transportation and installation; each tunnel lining unit is designed into a ring structure formed by connecting bottom building blocks, left side building blocks, right side building blocks and top building blocks which are segmented along the circumferential direction;

Step 2, prefabricating a bottom building block 1 outside the tunnel, and binding a left side building block reinforcement cage 2, a right side building block reinforcement cage 3 and a top building block reinforcement cage 4; the two ends of the annular stress steel bar 1.1 of the bottom building block 1 extend out of the radial joint faces of the annular stress steel bar 1.1 respectively and are used for being in lap joint with the annular stress steel bars of the left and right side building block steel reinforcement cages 2 and 3 which are connected with each other, the annular joint face of the bottom building block 1 is provided with a water stop tank for installing a water stop belt, and a positioning pin 1.2 is axially arranged in the bottom building block 1 and is used for positioning between the next tunnel lining unit which is connected with each other. The left and right side block reinforcement cages 2 and 3 and the top block reinforcement cage 4 are bound by an annular stress reinforcement 5 and a structural stirrup 6; the structural stirrup 6 is of a U-shaped structure, and the opening of the U-shaped structural stirrup 6 is arranged towards the direction of the next tunnel lining unit which is connected with the U-shaped structural stirrup and is used for being lapped with the structural stirrup of the next tunnel lining unit; the two ends of the annular stress steel bar 5 of the top building block steel bar cage 4 respectively extend out of the radial joint surface of the top building block steel bar cage and are used for being lapped with the annular stress steel bars 5 of the left and right side building block steel bar cages 1 and 3 which are connected with each other;

step 3, tunnel lining construction: firstly, laying a bottom building block 1 of a first tunnel lining unit, wherein the bottom building block plays a role of supporting a left building block reinforcement cage 2 and a right building block reinforcement cage 3 on one hand, and is used as a traffic foundation for equipment transportation in the tunnel on the other hand;

step 4, mounting left and right side block reinforcement cages 2 and 3 on the two circumferential sides of the laid bottom block 1, overlapping the circumferential stress reinforcement 1.1 of the bottom block 1 with the circumferential stress reinforcements 6 of the left and right side block reinforcement cages 2 and 3 which are connected with each other, and firmly connecting the two sides of the bottom block 1 in a binding or welding manner;

Step 5, the top block reinforcement cage 4 is installed to the top of the tunnel in a pushing mode, the annular stress reinforcement 5 of the top block reinforcement cage 4 is in lap joint with the annular stress reinforcements 5 of the left and right side block reinforcement cages 2 and 3 which are connected with each other, and the top block reinforcement cage 4, the left side block reinforcement cage 2, the right side block reinforcement cage 3 and the bottom block reinforcement cage 1 of the first tunnel lining unit are fixedly connected into a ring through a binding or welding mode, as shown in fig. 1;

Step 6, erecting a template, and pouring concrete to complete the integral lining structure of the first tunnel lining unit;

7, repeating the steps 3 to 6 to complete the integral lining structure of the second tunnel lining unit; before the template is erected in the step 6, the left and right side part building block steel reinforcement cages 2 and 3 and the structural stirrups 6 of the top building block steel reinforcement cage 4 of the first tunnel lining unit are correspondingly lapped and welded or firmly bound with the structural stirrups of the left and right side part building block steel reinforcement cages and the top building block steel reinforcement cage of the second tunnel lining unit, and then the template is erected and concrete is poured;

And 8, repeating the step 7 to finish the integral lining construction of the whole tunnel.

as shown in FIG. 4 ~ 7, the formwork comprises an arc-shaped reinforced concrete base formwork 7, a left side standard formwork 8, a right side standard formwork 9 and a top sealing formwork 10, the length of the arc-shaped reinforced concrete base formwork 7, the length of the left side standard formwork 8, the length of the right side standard formwork 9 and the length of the top sealing formwork 10 are 3 m along the axial direction, a traffic platform 7.1 for laying rails is arranged on the inner arc surface of the arc-shaped reinforced concrete base formwork 7, the left side standard formwork 8, the right side standard formwork 9 and the top sealing formwork 10 are all of steel framework structures, namely, the traffic platform is composed of an arc-shaped steel plate 11 and longitudinal and transverse rib plates 12 welded on the inner arc surface of the arc-shaped steel plate 11 and used for improving the strength, and the arc-shaped reinforced concrete base formwork 7 is connected with the left side standard formwork 8 and the right side standard formwork 9 and the left side standard formwork 8 and the right side standard formwork 9 are connected.

When erecting the template, laying the arc reinforced concrete base template 7 on the bottom building block 1, and laying a traffic platform 7.1 on the inner arc surface according to traffic needs; then, taking the arc reinforced concrete base template 7 as a support, arranging the left and right side standard templates 8 and 9 at two sides of the arc reinforced concrete base template 7, and connecting through high-strength bolts 13; and finally, the capping template 10 is pushed to the mounting position of the top of the tunnel and is connected with the left and right side standard templates 8 and 9 through high-strength bolts 13, so that a unit template ring is formed, as shown in fig. 4.

in addition, when the diameter of the tunnel is >10 meters, the left side block of the tunnel lining unit may be taken to consist of a first left side block and a second left side block; the right side block of the tunnel lining unit may also be comprised of a first right side block and a second right side block.