阅读说明：本技术 一种局部可拆修的衬砌结构和衬砌施工的方法 (Lining structure capable of being locally disassembled and repaired and lining construction method ) 是由 姜波 周跃峰 张涛 吴华 陈锡武 黄华 罗永刚 尹厚继 刘国强 于 2021-09-02 设计创作，主要内容包括：本发明公开了一种局部可拆修的衬砌结构和衬砌施工的方法,包括上部衬砌和下部衬砌,上部衬砌和下部衬砌之间连接有连接部件,连接部件包括连接块、第一定位板和第二定位板,连接块为台锥状,连接块靠近围岩一侧的表面的面积小于远离围岩一侧的表面的面积,第一定位板固定设置在连接块靠近围岩的一侧,上部衬砌、下部衬砌以及连接块远离围岩的一侧共同形成有容纳槽,第二定位板设置在容纳槽中,第一定位板、第二定位板与上部衬砌之间用第一紧固件固定连接,第一定位板、第二定位板与连接块之间用第二紧固件固定连接,第一定位板、第二定位板与下部衬砌之间用第三紧固件固定连接。本发明能安全、快速的进行局部衬砌的维修替换,能够减少断道时间。(The invention discloses a lining structure with local detachable repair and a lining construction method, which comprises an upper lining and a lower lining, wherein a connecting part is connected between the upper lining and the lower lining, the connecting part comprises a connecting block, a first positioning plate and a second positioning plate, the connecting block is in a truncated cone shape, the area of the surface of the connecting block close to one side of a surrounding rock is smaller than that of the surface of the connecting block far away from one side of the surrounding rock, the first positioning plate is fixedly arranged at one side of the connecting block close to the surrounding rock, an accommodating groove is formed by the upper lining, the lower lining and one side of the connecting block far away from the surrounding rock together, the second positioning plate is arranged in the accommodating groove, the first positioning plate, the second positioning plate and the upper lining are fixedly connected through a first fastener, the first positioning plate, the second positioning plate and the connecting block are fixedly connected through a second fastener, and the first positioning plate, the second positioning plate and the lower lining are fixedly connected through a third fastener. The invention can safely and quickly maintain and replace the local lining and can reduce the time of breaking the road.)

1. A partially collapsible lining structure comprising an upper lining and a lower lining;

the method is characterized in that:

detachable is connected with adapting unit between upper portion lining cutting and the lower part lining cutting, adapting unit includes connecting block, first locating plate and second locating plate, the connecting block is the frustum shape, the area that the connecting block is close to the surface of country rock one side is less than the area of keeping away from the surface of country rock one side, the connecting block with upper portion lining cutting, the whole cyclization of lower part lining cutting, first locating plate is fixed to be set up the connecting block is close to one side of country rock, upper portion lining cutting, lower part lining cutting and one side that the connecting block kept away from the country rock are formed with the holding tank jointly, the second locating plate sets up in the holding tank, first locating plate on the second locating plate with correspond on the upper portion lining cutting and be provided with more than one first connecting hole, first locating plate on the second locating plate with correspond on the connecting block and be provided with more than one second connecting hole, the first positioning plate, on the second positioning plate with correspond on the lower part lining and be provided with more than one third connecting hole, first positioning plate, the second positioning plate with use the first fastener of detachable to pass one between the upper portion lining first connecting hole fixed connection, first positioning plate, the second positioning plate with use the second fastener of detachable to pass one between the connecting block second connecting hole fixed connection, first positioning plate, the second positioning plate with use the third fastener of detachable to pass one between the lower part lining third connecting hole fixed connection, first fastener the second fastener the quantity of third fastener respectively with first connecting hole the second connecting hole the quantity of third connecting hole corresponds.

2. A partially demountable lining structure according to claim 1, wherein:

the first fastener comprises a first stud, a first outer nut is abutted to one side, close to the surrounding rock, of the first positioning plate of the first stud, and a first inner nut is abutted to one side, far away from the surrounding rock, of the second positioning plate of the first stud;

the second fastener comprises a second stud, a second outer nut is abutted to one side, close to the surrounding rock, of the first positioning plate through the second stud, and a second inner nut is abutted to one side, far away from the surrounding rock, of the second positioning plate through the second stud;

the third fastener includes the third double-screw bolt, the third double-screw bolt is in first locating plate is close to one side butt joint of country rock has the outer nut of third, the third double-screw bolt is in the second locating plate is kept away from one side butt joint of country rock has the interior nut of third.

3. A partially demountable lining structure according to claim 2, wherein:

the connecting block is close to one side of country rock is provided with the constant head tank, the mobilizable dress of wearing of second double-screw bolt is in the constant head tank, still be provided with supplementary nut on the second double-screw bolt, supplementary nut is located in the constant head tank.

4. A partially dismantled lining structure according to any of claims 1 to 3, wherein:

the connecting block is made of steel or high-strength concrete.

5. A partially dismantled lining structure according to any of claims 1 to 3, wherein:

the upper lining and the lower lining are formed by annularly and fixedly splicing more than three concrete prefabricated pipe pieces; alternatively, the first and second electrodes may be,

the upper lining comprises more than three concrete prefabricated pipe pieces which are annularly and fixedly spliced, and the lower lining is integrally formed.

6. A partially demountable lining structure according to claim 5, wherein:

one end of the concrete prefabricated segment adjacent to each other is provided with a first positioning piece, the other end of the concrete prefabricated segment close to the first positioning piece is provided with a second positioning piece, and the first positioning piece and the second positioning piece are matched to enable the concrete prefabricated segment to be spliced in a positioning mode.

7. A partially demountable lining structure according to claim 6, wherein:

and the adjacent concrete prefabricated segments are fixedly connected through bent bolt joints.

8. A method of lining construction of a partially dismantled lining structure according to any of claims 2 to 7, characterized in that:

the method comprises the steps of installation construction and replacement construction, wherein the installation construction step comprises the following steps:

the method comprises the following steps: splicing more than three precast concrete segments to form the lower lining, installing the lower lining at a preset position, fixing the adjacent precast concrete segments by using a first bent bolt joint, and fixedly installing the first positioning plate, the first stud, the second stud, the third stud, the first outer nut, the second outer nut and the third outer nut at the preset position;

step two: splicing more than three concrete prefabricated pipe pieces to form the upper lining by using a lifting device, fixing the adjacent concrete prefabricated pipe pieces by using second bent bolt joints, and lifting and installing the upper lining to a designed position;

step three: installing the connecting block between the upper lining and the lower lining, installing the second positioning plate in the accommodating groove, and installing and fixing the first inner nut, the second inner nut and the third inner nut;

the dismantling and replacing construction steps comprise:

step a: firstly, determining the precast concrete segment to be replaced, dismantling the first inner nut, the second inner nut, the third inner nut and the second positioning plate, and dismantling the first stud, the second stud, the third stud and the connecting block;

step b: removing the first bent bolt joint or the second bent bolt joint between the concrete prefabricated segment to be replaced and the concrete prefabricated segment connected with the concrete prefabricated segment, moving out the concrete prefabricated segment to be replaced and replacing a new concrete prefabricated segment;

step c 1: repeating the second and third steps of the installation and construction step when the upper lining construction is performed;

step c 2: repeating the first and third steps of the installation and construction step when the lower lining construction is performed.

9. A lining construction method according to claim 8 wherein:

one side of the connecting block, which is close to the surrounding rock, is provided with a positioning groove, and an auxiliary nut is arranged in the positioning groove;

the step a further comprises: along the direction that is close to tunnel country rock towards the direction of keeping away from tunnel country rock, will set up on the connecting block the second double-screw bolt is unscrewed and is predetermine the distance, utilizes in the constant head tank auxiliary nut is in with setting up on the connecting block the second double-screw bolt is torn open the connecting block.

10. A method of lining construction of a partially dismantled lining structure according to any of claims 2 to 7, characterized in that:

the method comprises the steps of installation construction and replacement construction, wherein the installation construction step comprises the following steps:

the method comprises the following steps: firstly, pouring concrete with a preset size in a cast-in-place mode at a preset position to form the lower lining, and fixedly installing a first positioning plate, the first stud, the second stud, the third stud, the first outer nut, the second outer nut and the third outer nut at the preset position;

step two: splicing more than three concrete prefabricated segments by using a lifting device to form the upper lining, fixing the adjacent concrete prefabricated segments by using bent bolt joints, and lifting and installing the upper lining to a designed position;

step three: installing the connecting block between the upper lining and the lower lining, installing the second positioning plate in the accommodating groove, and installing and fixing the first inner nut, the second inner nut and the third inner nut;

the dismantling and replacing construction steps comprise:

step a: firstly, determining a precast concrete segment to be replaced, dismantling the first inner nut, the second inner nut, the third inner nut and the second positioning plate, and dismantling the first stud, the second stud, the third stud and the connecting block;

step b: removing a bent bolt joint between the concrete prefabricated segment to be replaced and the concrete prefabricated segment connected with the concrete prefabricated segment, moving out the concrete prefabricated segment to be replaced and replacing a new concrete prefabricated segment;

step c 1: repeating the second and third steps of the installation and construction step when the upper lining construction is performed;

step c 2: repeating the first and third steps of the installation and construction step when the lower lining construction is performed.

Technical Field

The invention belongs to the technical field of tunnel engineering construction, and particularly relates to a lining structure with local detachable repair and a lining construction method.

Background

The tunnel engineering is under the condition of complex geological environment, and various damages such as structural cracking, reinforcement corrosion, groundwater seepage, freezing damage and the like can occur under the long-term action of stratum creep, groundwater, earthquake or vehicle load and the like in the long-term operation or use process, and the tunnel engineering has to be dismantled and replaced when the diseases are serious. In China at present, a large number of tunnel structures such as roads, railways and the like need to be disassembled, replaced and maintained.

At the current stage, for the removal and replacement maintenance of the lining, the lining is often partially or wholly removed, blasting or mechanical chiseling is usually adopted, and the current lining removal and replacement mode has the following disadvantages: firstly, the blasting mode can seriously affect the adjacent lining structure, and the mechanical chiseling has extremely low efficiency; secondly, cast-in-place concrete is often adopted to construct the structure again after the structure is dismantled, the construction difficulty of a formwork trolley in the tunnel, concrete maintenance and the like is extremely high, and the quality control of local dismantling and replacing seams is extremely difficult; thirdly, due to low construction efficiency and long-time broken road, very large additional economic loss is caused.

At present, a tunnel lining structure mainly adopts a customized template trolley to cast-in-place concrete lining structure in a tunnel, a subway and the like are constructed by a shield method in a large quantity, and a segment split type lining is mainly adopted. Both linings do not have the condition of being integrally or locally disassembled and replaced for maintenance, and can be removed only in an integral or local destructive mode if the structure is damaged and needs to be disassembled and replaced.

The Chinese utility model with publication number CN210033452U discloses a graded fracture-resistant mountain tunnel structure passing through a movable fracture zone, which comprises an outer lining layer, an outer waterproof layer, a deformation layer, a hollow corrugated steel pipe layer and an assembly secondary lining layer, wherein the outer lining layer, the outer waterproof layer, the deformation layer, the hollow corrugated steel pipe layer and the assembly secondary lining layer are sequentially arranged from outside to inside, and foam concrete is filled in the deformation layer; the hollow corrugated steel pipe layer is formed by connecting an external corrugated steel pipe and an internal corrugated steel pipe in a reverse butt joint mode; the assembly second lining layer is formed by splicing prefabricated second lining pipe pieces in the circumferential direction and the axial direction of the tunnel, wherein axially adjacent pipe pieces are spliced in a staggered joint mode, reserved bolt holes are distributed in the prefabricated second lining pipe pieces at the upper part, the lower part, the left part and the right part, elbow bolts in the upper reserved bolt holes and the lower reserved bolt holes are only distributed in the high-strength concrete layer, and the prefabricated second lining pipe pieces are connected into a high-strength concrete ring; the high-strength concrete ring is integrally connected in series along the axial direction of the tunnel through straight bolts in left and right reserved bolt holes. But after the two liner tubes are connected into the high-strength concrete ring, the whole structure is stably fit, and no large gap exists between the two adjacent liner tubes. When carrying out two lining section of jurisdiction tear open and trade the construction, must carry out the machinery with two adjacent lining section of jurisdiction that need change earlier and chisel or explode and demolish the back, just can tear out two lining section of jurisdiction that need change to because what the adjacent section of jurisdiction of axial adopted is the fissure of displacement concatenation mode, clearance and follow-up installation work are also very inconvenient, influence the efficiency that the construction was torn open and trade in the tunnel greatly, the time of extension tunnel broken track.

Disclosure of Invention

In order to solve the above-mentioned problems of the prior art, it is a first object of the present invention to provide a lining structure which is partially demountable.

A second object of the present invention is to provide a lining construction method of the lining structure.

In order to achieve the first purpose, the lining structure with the locally detachable and repairable function provided by the invention comprises an upper lining and a lower lining, wherein a connecting part is detachably connected between the upper lining and the lower lining, the connecting part comprises a connecting block, a first positioning plate and a second positioning plate, the connecting block is in a truncated cone shape, the area of the surface of the connecting block close to the side of the surrounding rock is smaller than that of the surface of the connecting block far away from the side of the surrounding rock, the connecting block, the upper lining and the lower lining are integrally formed into a ring, the first positioning plate is fixedly arranged on the side of the connecting block close to the surrounding rock, an accommodating groove is jointly formed on the upper lining, the lower lining and the side of the connecting block far away from the surrounding rock, the second positioning plate is arranged in the accommodating groove, more than one first connecting hole is correspondingly arranged on the first positioning plate and the second positioning plate with the upper lining, more than one second connecting hole is correspondingly arranged on the first positioning plate and the second positioning plate with the connecting block, the first positioning plate, correspond on the second positioning plate and the lower part lining and be provided with more than one third connecting hole, first positioning plate, use first fastener of detachable to pass a first connecting hole fixed connection between second positioning plate and the upper part lining, first positioning plate, use second fastener of detachable to pass a second connecting hole fixed connection between second positioning plate and the connecting block, first positioning plate, use third fastener of detachable to pass a third connecting hole fixed connection between second positioning plate and the lower part lining, first fastener, the second fastener, the quantity of third fastener corresponds with first connecting hole, the second connecting hole, the quantity of third connecting hole respectively.

It is from top to bottom visible, through connecting block, first locating plate, the second locating plate that sets up, with the whole fixed connection cyclization of upper portion lining cutting, lower part lining cutting, be the connection of dismantling between first locating plate, second locating plate, connecting block and upper portion lining cutting, the lower part lining cutting, the area on the surface that the connecting block is close to country rock one side is less than the area on the surface of keeping away from country rock one side. After demolising the connecting block, there is corresponding space between upper portion lining and the lower part lining, conveniently carry out the construction of changing of demolishing of upper portion lining or lower part lining, the mode that need not to remove through blasting or mechanical chisel like this is torn open and is changed upper portion lining or lower part lining, the mode that prevents to adopt the blasting makes adjacent lining structure receive the influence, need not to destroy whole or adjacent lining structure and can tear out the lining structure that needs to be changed, and demolish and the in-process of installation and adjacent lining structure each other not influence, the efficiency and the security of construction are greatly improved.

The first fastener comprises a first stud, a first outer nut is abutted to one side, close to the surrounding rock, of the first positioning plate of the first stud, and a first inner nut is abutted to one side, far away from the surrounding rock, of the second positioning plate of the first stud; the second fastener comprises a second stud, a second outer nut is abutted to one side, close to the surrounding rock, of the first positioning plate by the second stud, and a second inner nut is abutted to one side, far away from the surrounding rock, of the second positioning plate by the second stud; the third fastener comprises a third stud, a third outer nut is connected to one side, close to the surrounding rock, of the first positioning plate through the third stud in a butting mode, and a third inner nut is connected to one side, far away from the surrounding rock, of the second positioning plate through the third stud in a butting mode.

From top to bottom, through using stud nut with first locating plate, second locating plate respectively with upper portion lining cutting, lower part lining cutting and connecting block carry out fixed connection, fix the position that upper portion lining cutting, lower part lining cutting and connecting block are connected, play the effect of firm connection position.

The further scheme is that one side of the connecting block, which is close to the surrounding rock, is provided with a positioning groove, the second stud is movably arranged in the positioning groove in a penetrating manner, the second stud is further provided with an auxiliary nut, and the auxiliary nut is positioned in the positioning groove.

Further, the connecting block is made of steel or concrete.

From top to bottom, through set up supplementary nut on the connecting block, when carrying out the connecting block and demolish the second double-screw bolt on the connecting block and screw out predetermined distance, can be more convenient tear the connecting block out through the cooperation of second double-screw bolt and supplementary nut.

The further proposal is that the upper lining and the lower lining are both formed by annularly and fixedly splicing more than three concrete prefabricated segments; or the upper lining comprises more than three concrete prefabricated pipe pieces which are annularly and fixedly spliced, and the lower lining is integrally formed.

The concrete prefabricated pipe piece comprises a first positioning piece, a second positioning piece and a third positioning piece, wherein the first positioning piece is arranged at one end of one adjacent concrete prefabricated pipe piece, the second positioning piece is arranged at one end of the other adjacent concrete prefabricated pipe piece, which is close to the first positioning piece, and the first positioning piece and the second positioning piece are matched to enable the adjacent concrete prefabricated pipe pieces to be spliced in a positioning mode.

The further scheme is that adjacent concrete prefabricated segments are fixedly connected through bent bolt joints.

It is from top to bottom visible, through the cooperation of first setting element and second setting element between two adjacent precast concrete segments, reduced the degree of difficulty of assembling the construction, improved the efficiency of construction of assembling the lining cutting to through curved system bolted joint fixed connection between the adjacent precast concrete segments, improved tunnel lining structure's stability and security greatly.

In order to achieve the second object, the present invention provides the lining construction method of a lining structure with a locally removable lining structure, the method including a mounting construction step and a removal construction step, the mounting construction step including:

the method comprises the following steps: splicing more than three concrete prefabricated pipe pieces to form a lower lining and installing the lower lining at a preset position, wherein adjacent concrete prefabricated pipe pieces penetrate through first stud holes for fixing by using first bent bolt joints, and fixedly installing a first positioning plate, a first stud, a second stud, a third stud, a first outer nut, a second outer nut and a third outer nut at the preset position;

step two: splicing more than three concrete prefabricated segments by using a lifting device to form an upper lining, fixing adjacent concrete prefabricated segments by using second bent bolt joints through second stud holes, and lifting and installing the upper lining to a designed position;

step three: installing a connecting block between the upper lining and the lower lining, installing a second positioning plate in the accommodating groove, and installing a first inner nut, a second inner nut and a third inner nut for fixing;

the dismantling and replacing construction steps comprise:

step a: firstly, determining a precast concrete segment to be replaced, removing a first inner nut, a second inner nut, a third inner nut and a second positioning plate, and removing a first stud, a second stud, a third stud and a connecting block;

step b: removing a first bent bolt joint or a second bent bolt joint between the concrete prefabricated segment to be replaced and the concrete prefabricated segment connected with the concrete prefabricated segment, moving out the corresponding concrete prefabricated segment and replacing the corresponding concrete prefabricated segment with a new concrete prefabricated segment;

step c 1: when the upper lining construction is carried out, the second step and the third step in the construction steps are repeatedly installed;

step c 2: and when the lower lining construction is carried out, repeating the first step and the third step in the installation construction step.

The other scheme is that the method comprises an installation construction step and a removal construction step, wherein the installation construction step comprises the following steps:

the method comprises the following steps: firstly, pouring concrete with a preset size in a cast-in-place mode at a preset position to form a lower lining, and fixedly installing a first positioning plate, a first stud, a second stud, a third stud, a first outer nut, a second outer nut and a third outer nut at the preset position;

step two: splicing more than three concrete prefabricated segments by using a lifting device to form an upper lining, fixing adjacent concrete prefabricated segments by using bent bolt joints to penetrate through stud holes, and lifting and installing the upper lining to a designed position;

step three: installing a connecting block between the upper lining and the lower lining, installing a second positioning plate in the accommodating groove, and installing a first inner nut, a second inner nut and a third inner nut for fixing;

the dismantling and replacing construction steps comprise:

step a: firstly, determining a precast concrete segment to be replaced, removing a first inner nut, a second inner nut, a third inner nut and a second positioning plate of a connecting part, and removing a first stud, a second stud, a third stud and a connecting block;

step b: removing a bent bolt joint between the concrete prefabricated segment to be replaced and the concrete prefabricated segment connected with the concrete prefabricated segment, moving out the concrete prefabricated segment to be replaced and replacing a new concrete prefabricated segment;

step c 1: when the upper lining construction is carried out, the second step and the third step in the construction steps are repeatedly installed;

step c 2: and when the lower lining construction is carried out, repeating the first step and the third step in the installation construction step.

It can be seen from the above that, above-mentioned lining cutting construction method of lining cutting structure that local portion can be demolishd not only easy operation, can be convenient moreover through dismantling the connection structure between upper portion lining cutting and the lower part lining cutting realize dismantling and changing the local concrete prefabricated section of jurisdiction that needs to be changed, need not through blasting and the mechanical chiseling mode, guaranteed lining cutting structure's stability and security, the interior operating time of the tunnel that significantly reduces realizes salvageing tunnel lining cutting structure fast, reduces the outage time.

The further scheme is that a positioning groove is formed in one side, close to the surrounding rock, of the connecting block, and an auxiliary nut is installed in the positioning groove; step a also includes: the second stud bolt that will set up on the connecting block is unscrewed preset distance towards the direction of keeping away from tunnel country rock along the direction that is close to tunnel country rock, utilizes the auxiliary nut in the constant head tank and sets up the second stud bolt on the connecting block to tear out the connecting block.

Therefore, the second stud is screwed out for a preset distance, and the connecting block can be conveniently detached through the matching of the second stud and the connecting block.

In summary, the lining structure with the locally detachable lining structure can be conveniently detached and replaced by detaching the connecting block when being detached and replaced, the risk that the stability of the adjacent lining structure is seriously affected is avoided, and the efficiency of installation construction and detaching and replacing construction is greatly improved.

Drawings

FIG. 1 is a block diagram of a partially collapsible lining structure according to the present invention.

Fig. 2 is an enlarged view of a point a in fig. 1.

Fig. 3 is an enlarged view at B in fig. 1.

Detailed Description

Referring to fig. 1 and 2, the partially collapsible lining structure of the present embodiment includes an upper lining 1, a connecting member 3, and a lower lining 2, the connecting member 3 includes a connecting block 5, a first positioning plate 6, and a second positioning plate 4, the connecting block 5 is a truncated cone shape and is made of steel or high strength concrete, and the high strength concrete of the present embodiment is concrete of grade C60 or above. The area of the surface of one side, close to the surrounding rock, of the connecting block 5 is smaller than that of the surface of one side, far away from the surrounding rock, of the connecting block 5, the connecting block 5 is integrally formed into a ring with the upper lining 1 and the lower lining 2, the first positioning plate 6 is fixedly installed on one side, close to the surrounding rock, of the connecting block 5, the accommodating groove 7 is formed in one side, far away from the surrounding rock, of the upper lining 1, the second positioning plate 4 is installed in the accommodating groove 7, the first connecting hole 8 is correspondingly formed in the first positioning plate 6, the second positioning plate 4 and the upper lining 1, the second connecting holes 9 are correspondingly formed in the first positioning plate 6, the second positioning plate 4 and the connecting block 5, the third connecting holes 10 are correspondingly formed in the first positioning plate 6, the second positioning plate 4 and the lower lining 2, the first stud 11 penetrates through the first connecting hole 8, and the two ends of the first stud 11 are respectively provided with a first outer nut 14 and a first inner nut 17, the first outer nut 14 abuts against one side, close to the surrounding rock, of the first positioning plate 6, and the first inner nut 17 abuts against one side, far away from the surrounding rock, of the second positioning plate 4; the second stud 12 penetrates through the second connecting hole 9, a second outer nut 15 and a second inner nut 18 are respectively arranged at two ends of the second stud 12, the second outer nut 15 abuts against one side, close to the surrounding rock, of the first positioning plate 6, and the second inner nut 18 abuts against one side, far away from the surrounding rock, of the second positioning plate 4; the third stud 13 penetrates through the third connecting hole 10, a third outer nut 16 and a third inner nut 19 are respectively arranged at two ends of the third stud 13, the third outer nut 16 abuts against one side, close to the surrounding rock, of the first positioning plate 6, and the third inner nut 19 abuts against one side, far away from the surrounding rock, of the second positioning plate 4. The upper lining 1, the lower lining 2, the first positioning plate 6, the second positioning plate 4 and the connecting block 5 are detachably and fixedly connected through the matching among the first stud 11, the first outer nut 14, the first inner nut 17, the second stud 12, the second outer nut 15, the second inner nut 18, the third stud 13, the third outer nut 16 and the third inner nut 19, so that the purpose of partially disassembling and replacing the upper lining 1 and the lower lining 2 is achieved. Optionally, the upper lining 1, the lower lining 2, the first positioning plate 6, the second positioning plate 4 and the connecting block 5 are fixedly connected by using the existing fasteners, which will not be described herein again.

Preferably, the number of the first connecting holes 8, the second connecting holes 9 and the third connecting holes 10 is not only one, the number of the first studs 11, the first outer nuts 14 and the first inner nuts 17 corresponds to the number of the first connecting holes 8, the number of the second studs 12, the second outer nuts 15 and the second inner nuts 18 corresponds to the number of the second connecting holes 9, and the number of the third studs 13, the third outer nuts 16 and the third inner nuts 19 corresponds to the number of the third connecting holes 10.

Referring to fig. 1 and 3, the upper lining 1 is formed by annularly and fixedly splicing five concrete prefabricated pipe pieces 21, the lower lining 2 is formed by annularly and fixedly splicing three concrete prefabricated pipe pieces 21, first positioning pieces 23 are arranged at two ends of the concrete prefabricated pipe piece 21 of the arch top, a second positioning piece 22 is correspondingly arranged at one end of the concrete prefabricated pipe piece 21 of the adjacent two opposite sides connected with the concrete prefabricated pipe piece 21 of the arch top, second positioning pieces 22 are respectively arranged at two ends of the concrete prefabricated pipe piece 21 of the arch bottom, a first positioning piece 23 is correspondingly arranged at one end of the concrete prefabricated pipe piece 21 of the adjacent two opposite sides connected with the concrete prefabricated pipe piece 21 of the arch bottom, the surface of one end of the concrete prefabricated pipe piece 21 connected with the connecting block 5 is correspondingly matched with the surface of the connecting block 5, the first positioning piece 23 is a wedge-shaped block, the second positioning piece 22 is a concave groove, the wedge-shaped block is matched with the concave groove, the splicing is convenient for constructors to splice. The first positioning element and the second positioning element which can be selected can be matched and connected by adopting the existing structure, and the details are not repeated. And adjacent concrete prefabricated pipe pieces 21 are fastened by adopting bent bolt joints 20. The modular lining structure is beneficial to saving the construction cost of dismantling and replacing and is convenient to construct. Optionally, the lower lining is cast integrally.

Preferably, the upper lining and the lower lining are formed by splicing more than three concrete precast segments 21.

Referring to fig. 2, a positioning groove 24 is formed in one side, close to the surrounding rock, of the connecting block 5, and an auxiliary nut 25 is arranged on the inner side, close to the first positioning plate 6, of the second stud 12, and the auxiliary nut 25 is installed in the positioning groove 24. The second stud 12 is screwed off the second outer nut 15 to the position of the auxiliary nut 25, and the connecting block 5 can be conveniently detached through the matching of the auxiliary nut 25 and the positioning groove 24 and the matching of the auxiliary nut 25 and the second stud 12.

The invention also provides a lining construction method of the lining structure with the locally detachable and repairable part, which comprises the steps of installation construction and replacing construction, wherein the steps of installation construction comprise:

the method comprises the following steps: the method comprises the steps of splicing more than three concrete prefabricated pipe pieces 21 to form a lower lining 2, installing the lower lining 2 at a preset position, fixing adjacent concrete prefabricated pipe pieces 21 by using a first bent bolt joint 26, and then fixedly installing a first positioning plate 6, a first stud 11, a second stud 12, a third stud 13, a first outer nut 14, a second outer nut 15 and a third outer nut 16 at the preset position.

Step two: and splicing more than three concrete prefabricated pipe pieces 21 by using a lifting device to form the upper lining 1, fixing the adjacent concrete prefabricated pipe pieces 21 by using second bent bolt joints 20, and lifting and installing the upper lining 1 to a designed position.

Step three: a connecting block 5 is arranged between the upper lining 1 and the lower lining 2, a second positioning plate 4 is arranged in the accommodating groove 7, and a first inner nut 17, a second inner nut 18 and a third inner nut 19 are arranged for fixing.

The dismantling and replacing construction steps comprise:

step a: firstly, a precast concrete segment 21 to be replaced is determined, a first inner nut 17, a second inner nut 18, a third inner nut 19 and a second positioning plate 4 of a connecting part 3 are removed, and then a first stud 11, a second stud 12, a third stud 13 and a connecting block 5 are removed.

Step b: the first bent bolt joint 26 or the second bent bolt joint 20 between the concrete prefabricated segment 21 to be replaced and the concrete prefabricated segment 21 connected therewith is removed, the concrete prefabricated segment 21 to be replaced is removed and a new concrete prefabricated segment 21 is replaced.

Step c 1: when the upper lining 1 is constructed, the second and third steps of the installation construction step are repeated.

Step c 2: when the lower lining 2 construction is performed, the first and third steps of the installation construction step are repeated.

Optionally, when the lower lining is integrally formed, the installation and construction steps may further include:

the method comprises the following steps: firstly, pouring concrete with a preset size in a cast-in-place mode at a preset position to form a lower lining 2, and fixedly installing a first positioning plate 6, a first stud 11, a second stud 12, a third stud 13, a first outer nut 14, a second outer nut 15 and a third outer nut 16 at the preset position.

Step two: and splicing more than three concrete prefabricated pipe pieces 21 by using a lifting device to form the upper lining 1, fixing the adjacent concrete prefabricated pipe pieces 21 by using bent bolt joints 20, and lifting and installing the upper lining 1 to a designed position.

Step three: a connecting block 5 is installed between the upper lining 1 and the lower lining 2, a second positioning plate 4 is installed in the accommodating groove 7, and a first inner nut 17, a second inner nut 18 and a third inner nut 19 are installed for fixation.

The dismantling and replacing construction steps comprise:

step a: firstly, determining a precast concrete segment 21 to be replaced, removing a first inner nut 17, a second inner nut 18, a third inner nut 19 and a second positioning plate 4 of a connecting part 3, and then removing a first stud 11, a second stud 12, a third stud 13 and a connecting block 5.

Step b: the bent bolt joints 20 between the concrete prefabricated segment 21 to be replaced and the concrete prefabricated segment 21 connected therewith are removed, the corresponding concrete prefabricated segment 21 is removed and a new concrete prefabricated segment 21 is replaced.

Step c 1: when the upper lining 1 is constructed, the second and third steps of the installation construction step are repeated.

Step c 2: when the lower lining 2 construction is performed, the first and third steps of the installation construction step are repeated.

Preferably, one side of the connecting block 5 in the embodiment, which is close to the surrounding rock, is provided with a positioning groove 24, and an auxiliary nut 25 is installed in the positioning groove 24;

step a also includes: and screwing out the second stud 12 arranged on the connecting block 5 by a preset distance along the direction close to the tunnel surrounding rock and towards the direction far away from the tunnel surrounding rock, and detaching the connecting block 5 by utilizing the auxiliary nut 25 in the positioning groove 24 and the second stud 12 arranged on the connecting block 5.

In conclusion, the local detachable lining structure can effectively avoid the serious influence on the adjacent lining structures when the local lining structure is detached and replaced, the installation and construction operation is simple and convenient, the subsequent detachment and replacement construction does not need to mechanically chisel the adjacent lining structures, the operation time in a tunnel is greatly reduced, the construction efficiency is improved, the rapid rush repair can be carried out, the disconnection time is reduced, and the economic efficiency is certain.

It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept also fall within the protection scope of the present invention.