阅读说明：本技术 一种基于气囊钢环的盾构管片预加固结构及施工方法 (Shield segment pre-reinforcing structure based on air bag steel ring and construction method ) 是由 刘健美 顾锋 翟利华 邹成路 卢晓智 朱能文 柳宪东 毛武峰 于 2021-07-13 设计创作，主要内容包括：一种基于气囊钢环的盾构管片预加固结构,包括衬砌管片,内钢圈层、道床板和固定机构；衬砌管片沿隧道内部铺设拼接并呈一环形外圈部；道床板设于环形外圈部的内壁面的底部；内钢圈层与衬砌管片连接并沿环形外圈部的内壁面铺设,内钢圈层包括气囊层和钢环层,气囊层设于钢环层与衬砌管片之间；内钢圈层与固定机构的一端连接,固定机构的另一端与道床板连接。本发明为了预防隧道盾构管片受外荷载影响而产生的横向变形,并考虑到在隧道横向变形发生后,通过填充气囊层使变形量得到一定的改善,并抑制其进一步发展。内钢圈层属于一种预制结构,拼装工艺快捷,并且便于拆卸。适用于受外部环境干扰敏感区域或曲率半径较小的隧道区间。(A shield segment pre-reinforcing structure based on an air bag steel ring comprises a lining segment, an inner steel ring layer, a bed plate and a fixing mechanism; the lining segment is laid and spliced along the inside of the tunnel and is in an annular outer ring part; the road bed plate is arranged at the bottom of the inner wall surface of the annular outer ring part; the inner steel ring layer is connected with the lining segment and laid along the inner wall surface of the annular outer ring part, the inner steel ring layer comprises an air bag layer and a steel ring layer, and the air bag layer is arranged between the steel ring layer and the lining segment; the inner steel ring layer is connected with one end of the fixing mechanism, and the other end of the fixing mechanism is connected with the ballast bed plate. The invention aims to prevent the transverse deformation of the tunnel shield segment caused by the influence of external load, and considers that the deformation is improved to a certain extent by filling the air bag layer after the transverse deformation of the tunnel occurs, and further development of the deformation is inhibited. The inner steel ring layer belongs to a prefabricated structure, the assembling process is fast, and the disassembly is convenient. The method is suitable for the sensitive area interfered by the external environment or the tunnel interval with smaller curvature radius.)

1. The utility model provides a shield constructs section of jurisdiction and adds reinforced structure in advance based on gasbag steel ring which characterized in that includes:

the lining pipe piece, the inner steel ring layer, the ballast bed plate and the fixing mechanism;

the lining segment is paved and spliced along the inside of the tunnel and is in an annular outer ring part;

the track bed plate is arranged at the bottom of the inner wall surface of the annular outer ring part;

the inner steel ring layer is connected with the lining segment and laid along the inner wall surface of the annular outer ring part, the inner steel ring layer comprises an air bag layer and a steel ring layer, and the air bag layer is arranged between the steel ring layer and the lining segment;

the inner steel ring layer is connected with one end of the fixing mechanism, and the other end of the fixing mechanism is connected with the ballast bed plate.

2. The shield segment pre-reinforcing structure based on the airbag steel ring as claimed in claim 1, wherein the lining segment comprises a top sealing block, an abutting block, a standard block and a bottom sealing block, the top sealing block is arranged at the top of the inside of the tunnel, the abutting block is connected with two sides of the top sealing block, the bottom sealing block is arranged at the bottom of the inside of the tunnel, and the standard block is arranged between the bottom sealing block and the abutting block.

3. The pre-reinforcing structure for the shield segment based on the air bag steel ring as claimed in claim 2, wherein the top sealing block, the abutting block, the standard block and the bottom sealing block are assembled annularly and then spliced longitudinally.

4. The pre-reinforcing structure for the shield segment based on the air bag steel ring as claimed in claim 3, wherein the left and right ends of the steel ring layer are provided with a steel strand duct and a bolt hole.

5. The pre-reinforcing structure for the shield segment based on the airbag steel ring as claimed in claim 4, wherein the left and right ends of the steel ring layer are provided with connecting portions, each connecting portion comprises a connecting groove and a connecting protrusion, the adjacent steel ring layers are connected through the connecting portions, the connecting grooves of the adjacent connecting portions are matched with the connecting protrusions, and the steel strand hole channels and the bolt holes are formed in the connecting portions.

6. The pre-reinforcing structure for shield segments based on the air bag steel ring of claim 3, wherein the lower portion is provided with a plurality of ribs, and weight-reducing grooves are formed between the plurality of ribs.

7. The pre-reinforcing structure for shield segments based on the steel balloon ring as claimed in claim 1, wherein the fixing mechanism comprises a fixing bracket, rubber gaskets are respectively disposed at the joints of the fixing bracket and the inner steel ring layer and the ballast bed plate, and expansion bolt pieces for fixed connection are further disposed at the joints of the fixing bracket and the inner steel ring layer and the ballast bed plate.

8. A construction method according to claim 1, characterised by comprising the steps of:

s1, processing the inner steel ring layer, namely processing the steel ring layer firstly, and then installing the air bag layer on the steel ring layer;

s2, carrying out anti-rust treatment on the inner steel ring layer;

s3, preassembling a fixing mechanism on the track bed slab;

s4, laying and splicing the inner steel ring layer along the annular outer ring part;

s5, performing rust prevention treatment on the splicing part of the inner steel ring layer;

and S6, reinforcing and rectifying the lining segment by the air bag layer filling material.

9. The pre-reinforcing structure for the shield segment based on the airbag steel ring as claimed in claim 8, wherein in step S4, the left and right ends of the steel ring layer are provided with connecting portions, each connecting portion comprises a connecting groove and a connecting protrusion, the adjacent steel ring layers are connected through the connecting portions, the connecting grooves of the adjacent connecting portions are matched with the connecting protrusions, the steel strand hole and the bolt holes are formed in the connecting portions, the bolt pieces are arranged on the bolt holes to longitudinally anchor the spliced steel ring layers, transverse steel strands are arranged on the steel strand hole, and pre-stress is applied through tensioning.

10. The shield segment pre-reinforcing structure based on the air bag steel ring as claimed in claim 8, wherein in step S6, the following operations are specifically performed:

if the tunnel has transverse structural deformation under the interference of external environment, filling the fluid material into the air bag layer, and stopping filling when the deformation of the tunnel structure is restrained;

if the tunnel structure is further deformed, the balloon layer is filled with a curing material to restore the amount of structural deformation that has occurred in the portion, and the development of deformation of the tunnel structure is suppressed again.

Technical Field

The invention belongs to the technical field of shield tunnel structure reinforcement, and particularly relates to a shield segment pre-reinforcement structure based on an air bag steel ring and a construction method.

Background

In recent years, with the rapid development of urban rail transit in China, the problem of diseases of subway tunnel structures is increasing. When the tunnel is interfered by external environment (such as foundation pit excavation, close construction and the like), the stress state of the structure can be changed, so that the tunnel structure is transversely deformed, the phenomena of duct piece cracking, leakage, bolt fracture and the like can be caused in serious conditions, and finally potential safety hazards are brought to train operation.

The inner steel ring reinforcing measure for the shield segment structure in the current engineering is mainly to bond the steel ring on the inner wall of the concrete segment through a bonding material, the joint adopts a welding mode, and the steel ring and the joint form an integral structure so as to resist external load together. Although the method can enhance the integral rigidity of the tunnel structure, the construction is complex, the construction period is long, and the influence on the deformation generated by the recovery segment structure is little.

In addition, common remedial measures for tunnel structure deformation in engineering include: lateral grouting; reinforcing carbon fiber and aramid fiber cloth; and (5) connecting and reinforcing the I-shaped steel. The scholars also put forward some new reinforcing measures, such as reinforcing the pipe piece by prestressing force applied by steel strands in a full ring; reinforcing the segment joint by special-shaped alloy; a tunnel segment rounder; and the prestressed steel strand reinforces the segment joint and the like.

It can be seen from above-mentioned reinforcement measure, the reinforcement to tunnel structure section of jurisdiction is the remedy treatment after the deformation takes place for the most part at present, fails to play prophylactic effect. Therefore, it is very important to provide a duct piece reinforcing measure that can not only enhance the overall rigidity, but also improve the structural deformation, for the problem of the transverse deformation of the tunnel structure.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a shield segment pre-reinforcing structure based on an air bag steel ring, and aims to solve the problems in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a shield constructs section of jurisdiction and adds reinforced structure in advance based on gasbag steel ring, includes:

the lining pipe piece, the inner steel ring layer, the ballast bed plate and the fixing mechanism;

the lining segment is paved and spliced along the inside of the tunnel and is in an annular outer ring part;

the track bed plate is arranged at the bottom of the inner wall surface of the annular outer ring part;

the inner steel ring layer is connected with the lining segment and laid along the inner wall surface of the annular outer ring part, the inner steel ring layer comprises an air bag layer and a steel ring layer, and the air bag layer is arranged between the steel ring layer and the lining segment;

the inner steel ring layer is connected with one end of the fixing mechanism, and the other end of the fixing mechanism is connected with the ballast bed plate.

Preferably, the lining segment includes a top sealing block, an adjacent block, a standard block and a bottom sealing block, the top sealing block is arranged at the top inside the tunnel, the adjacent block is connected with the two sides of the top sealing block, the bottom sealing block is arranged at the bottom inside the tunnel, and the standard block is arranged between the bottom sealing block and the adjacent block.

Preferably, the steel ring layer comprises an upper layer part and a lower layer part, the upper layer part is provided with a groove part for placing the air bag layer, two sides of the groove part are provided with side plates, and the lower layer part is provided with a plurality of filling holes communicated with the groove part.

Preferably, the left end and the right end of the steel ring layer are provided with a steel strand pore channel and a bolt hole.

Preferably, both ends are equipped with connecting portion about the steel ring layer, connecting portion include connecting groove and connection arch, connect through connecting portion between the adjacent steel ring layer, the connecting groove and the connection arch of adjacent connecting portion cooperate, steel strand wires pore and bolt hole are located connecting portion.

Preferably, the lower part is provided with a plurality of ribs, and weight reduction grooves are formed among the ribs.

Preferably, the fixing mechanism comprises a fixing support, rubber gaskets are respectively arranged at the joints of the fixing support and the inner steel ring layer and the track bed plate, and expansion bolt pieces for fixed connection are further arranged at the joints of the fixing support and the inner steel ring layer and the track bed plate.

The invention also discloses a construction method of the shield segment pre-reinforcing structure based on the airbag steel ring, which comprises the following steps:

s1, processing the inner steel ring layer, namely processing the steel ring layer firstly, and then installing the air bag layer on the steel ring layer;

s2, carrying out anti-rust treatment on the inner steel ring layer;

s3, preassembling a fixing mechanism on the track bed slab;

s4, laying and splicing the inner steel ring layer along the annular outer ring part;

s5, performing rust prevention treatment on the splicing part of the inner steel ring layer;

and S6, reinforcing and rectifying the lining segment by the air bag layer filling material.

Preferably, in step S4, both ends are equipped with connecting portion about the steel ring layer, connecting portion include connecting groove and connection arch, connect through connecting portion between the adjacent steel ring layer, the connecting groove and the connection arch of adjacent connecting portion cooperate, steel strand wires pore and bolt hole are located connecting portion set up bolt spare on the bolt hole and carry out vertical anchor to the steel ring layer department of splicing mutually, arrange horizontal steel strand wires on steel strand wires pore, exert prestressing force through the stretch-draw.

Preferably, in step S6, the specific operations are as follows:

if the tunnel has transverse structural deformation under the interference of external environment, filling the fluid material into the air bag layer, and stopping filling when the deformation of the tunnel structure is restrained;

if the tunnel structure is further deformed, the balloon layer is filled with a curing material to restore the amount of structural deformation that has occurred in the portion, and the development of deformation of the tunnel structure is suppressed again.

Compared with the prior art, the invention has the beneficial effects that:

the invention discloses a shield segment pre-reinforcing structure based on an air bag steel ring, which mainly aims to prevent the transverse deformation of a tunnel shield segment caused by the influence of external load, and consider that the deformation is improved to a certain extent by filling an air bag layer after the transverse deformation of a tunnel occurs, and further development of the shield segment pre-reinforcing structure is inhibited. The inner steel ring layer belongs to a prefabricated structure, the assembling process is fast, and the disassembly is convenient. The method is suitable for the sensitive area interfered by the external environment or the tunnel interval with smaller curvature radius.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view of an upper portion of the steel ring layer A-A of FIG. 1;

FIG. 4 is a cross-sectional view B-B of FIG. 1;

FIG. 5 is a right side view in section B-B of FIG. 1;

FIG. 6 is a block diagram of the securing mechanism of the present invention;

FIG. 7 is a flow chart of the construction method of the present invention;

description of reference numerals:

1-ballast bed plate, 2-top sealing block, 3-adjacent block, 4-standard block, 5-bottom sealing block, 6-upper layer part, 7-lower layer part, 8-groove part, 9-air bag layer, 10-side plate, 11-steel strand pore channel, 12-bolt hole, 13-connecting groove, 14-connecting bulge, 15-rib, 16-weight reducing groove, 17-fixing support, 18-rubber gasket, 19-expansion bolt piece and 20-steel ring layer.

Detailed Description

In order to make the technical problems solved, technical solutions adopted, and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention are described in further detail below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 to 7, an embodiment of the present invention provides a shield segment pre-reinforcing structure based on an airbag steel ring, including:

the lining pipe piece, the inner steel ring layer, the ballast bed plate 1 and the fixing mechanism;

the lining segment is paved and spliced along the inside of the tunnel and is in an annular outer ring part;

the ballast bed plate 1 is arranged at the bottom of the inner wall surface of the annular outer ring part;

the inner steel ring layer is connected with the lining pipe piece and laid along the inner wall surface of the annular outer ring part, the inner steel ring layer comprises an air bag layer 9 and a steel ring layer 20, and the air bag layer 9 is arranged between the steel ring layer 20 and the lining pipe piece;

the inner steel ring layer is connected with one end of the fixing mechanism, and the other end of the fixing mechanism is connected with the ballast bed plate 1.

Specifically, the lining segment includes top seal piece 2, adjacency block 3, standard block 4 and back cover piece 5, top seal piece 2 locates the inside top in tunnel, adjacency block 3 with the both sides of top seal piece 2 are connected, back cover piece 5 locates the inside bottom in tunnel, standard block 4 locates back cover piece 5 with between the adjacency block 3.

Specifically, the steel ring layer 20 includes an upper layer portion 6 and a lower layer portion 7, the upper layer portion 6 is provided with a groove portion 8 for placing the airbag layer 9, side plates 10 are arranged on two sides of the groove portion 8, and the lower layer portion 7 is provided with a plurality of filling holes communicated with the groove portion 8. The airbag layer 9 may also be an airbag.

Specifically, the left end and the right end of the steel ring layer 20 are provided with a steel strand pore canal 11 and a bolt hole 12.

Specifically, both ends are equipped with connecting portion about steel ring layer 20, connecting portion include connecting groove 13 and connecting protrusion 14, connect through connecting portion between the adjacent steel ring layer 20, the connecting groove 13 and the connecting protrusion 14 of adjacent connecting portion cooperate, steel strand wires pore 11 and bolt hole 12 are located connecting portion.

Specifically, the lower portion 7 is provided with a plurality of ribs 15, and weight-reducing grooves 16 are formed between the plurality of ribs 15.

By adopting the structure, the steel strand pore canal 11 is used for transverse stranding of the steel ring, and the bolt hole 12 is used for longitudinal anchoring of the steel ring. The joint between the adjacent steel ring layers 20 adopts a structure of a concave-convex groove interface, so that the biting force between the steel ring layers 20 is increased. The weight-reducing grooves 16 are provided in the lower portion 7 of the steel ring layer 20, so that the structural weight of the steel ring layer 20 can be reduced.

Specifically, the fixing mechanism includes a fixing support 17, rubber gaskets 18 are respectively arranged at the joints of the fixing support 17 and the inner steel ring layer and the track bed plate 1, and expansion bolt pieces 19 for fixed connection are further arranged at the joints of the fixing support 17 and the inner steel ring layer and the track bed plate 1.

By adopting the structure, the bottom end of the inner steel ring layer is vertically anchored by utilizing the expansion bolt piece 19 and is further anchored by the expansion bolt piece 19 in the longitudinal direction, and the joints of the steel fixing support 17, the inner steel ring layer and the ballast bed plate 1 are respectively provided with the rubber gaskets 18, so that the local damage of the component in the anchoring process is prevented.

The invention discloses a shield segment pre-reinforcing structure based on an air bag steel ring, which mainly aims to prevent the transverse deformation of a tunnel shield segment caused by the influence of external load, and consider that the deformation is improved to a certain extent by filling an air bag layer 9 after the transverse deformation of a tunnel occurs, and further development of the shield segment pre-reinforcing structure is inhibited. The inner steel ring layer belongs to a prefabricated structure, the assembling process is fast, and the disassembly is convenient. The method is suitable for the sensitive area interfered by the external environment or the tunnel interval with smaller curvature radius.

The invention also discloses a construction method of the shield segment pre-reinforcing structure based on the airbag steel ring, which comprises the following steps:

s1, processing the inner steel ring layer, namely processing the steel ring layer 20 firstly, and then installing the air bag layer 9 on the steel ring layer 20, specifically: firstly, calculating the structural stress and deformation parameters of the steel ring layer 20 by combining the size of the lining segment structure and the borne external load, and preliminarily determining the structural type, the size and other parameters of the steel ring layer 20; secondly, arranging the air bag in the groove part 8 of the upper layer part 6 of the steel ring layer 20, sealing and fixing two ends of the air bag, and checking the air tightness of the air bag through a filling hole;

s2, carrying out anti-rust treatment on the inner steel ring layer;

s3, preassembling a fixing mechanism on the track bed slab 1;

s4, laying and splicing the inner steel ring layer along the annular outer ring part;

s5, performing rust prevention treatment on the splicing part of the inner steel ring layer;

and S6, filling materials for the air bag layer 9 are used for reinforcing and rectifying the lining segment.

Specifically, in step S4, the structural stress and long-term deformation state of the steel ring layers 20 under the action of load are calculated, and the joint form between the adjacent steel ring layers 20 and the sizes and positions of the bolt holes 12 and the steel strand ducts 11 are preliminarily determined: specifically, both ends are equipped with connecting portion about steel ring layer 20, connecting portion include connecting groove 13 and connect arch 14, connect through connecting portion between the adjacent steel ring layer 20, the connecting groove 13 of adjacent connecting portion cooperatees with connecting arch 14, steel strand wires pore 11 and bolt hole 12 are located connecting portion set up bolt spare on bolt hole 12 and carry out vertical anchor to the steel ring layer 20 department of splicing mutually, arrange horizontal steel strand wires on steel strand wires pore 11, exert prestressing force through the stretch-draw.

Specifically, in step S6, the following operations are specifically performed:

if the tunnel has a transverse structural deformation under the interference of the external environment, the air bag layer 9 can be filled with fluid materials, and the filling is stopped when the deformation of the tunnel structure is restrained;

if the tunnel structure is further deformed, the balloon layer 9 is filled with a curing material to restore the amount of structural deformation that has occurred in the part, and the development of deformation of the tunnel structure is suppressed again.

The shield segment pre-reinforcing structure based on the air bag steel ring is characterized in that the air bag layer 9 is arranged in the groove part 8 of the upper layer part 6 of the steel ring layer 20, when the tunnel structure needs to be further reinforced due to the development of transverse deformation, fluid or solid materials are filled into the air bag layer 9, so that the stress of a lining segment is more uniform, the development of the transverse deformation of the structure is inhibited, and the generated deformation is reduced. The prefabricated steel ring layers 20 are connected through longitudinal bolts and transverse steel strands, rigidity between the prefabricated steel ring layers 20 is enhanced, and the bottoms of the prefabricated steel ring layers 20 are embedded in the fixed support 17 and are anchored through the bolts. The whole structure adopts a prefabricated assembly mode, and is simple to operate and convenient to detach. This interior steel ring layer is assembling the back of accomplishing, can play the reinforced effect of prevention to tunnel structure to when tunnel structure takes place lateral deformation, just can carry out the secondary reinforcement and restrain lateral deformation's development through simple operation to tunnel structure. In addition, when a large lateral deformation occurs in the tunnel structure, the amount of the tunnel lateral deformation can be reduced and the development of the deformation can be further suppressed by filling the balloon layer 9 with a curing material. The filling and reinforcing process is simple in process, the selection of the filling material of the air bag layer 9 can be suitable for different conditions, the filling process is flexible and flexible, the transverse deformation of the structure is improved, the overall stress and harmony of the structure are improved, and the normal operation of a train is basically not influenced during the reinforcing process.

Compared with the existing tunnel structure deformation treatment technology, the method has the following advantages:

1) the structure belongs to a prefabricated assembling structure, and has the characteristics of simplicity in operation, short period and convenience in disassembly when the tunnel segment is reinforced.

2) This interior steel ring layer structure when consolidating the tunnel segment, the accessible fills gasbag layer 9 and provides secondary pre-reinforcement for the lining cutting section of jurisdiction and handles.

3) This reinforced structure can provide three kinds of reinforcement forms, including steel ring layer 20 self reinforcement, gasbag layer 9 packing fluid material reinforcement and gasbag layer 9 packing solid material reinforcement, can take different reinforcement forms according to the different transverse deformation degree of section of jurisdiction in actual engineering to this controls and resumes structure transverse deformation more effectively, thereby ensures tunnel structure's overall stability and serviceability.

In the description herein, it is to be understood that the terms "upper," "lower," "left," "right," and the like are used in an orientation or positional relationship merely for convenience in description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, configuration, and operation in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.