阅读说明：本技术 一种mjs跳孔对称加固施工方法 (MJS jump hole symmetrical reinforcement construction method ) 是由 李展峰 孙小猛 杨鑫 陆跃 孙顺熹 郑久常 程桂芝 陶路路 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种MJS跳孔对称加固施工方法,包括如下步骤：运营线隧道清理、MJS跳孔管布设、加固装置安装和MJS跳孔加固施工。本发明以运营线隧道的纵向轴线为基准,在另一侧对应原孔位径向对称的位置增加同样的孔位,相对的两个孔位同时钻孔,依次跳桩进行施工MJS工法桩,以达到MJS施工对两侧产生等效的应力变化,满足加固的质量要求,不改变MJS工法桩的基本施工工艺,可操作性腔,容易推广,且施工安全系数高。(The invention discloses an MJS jump hole symmetrical reinforcement construction method, which comprises the following steps: clearing an operation line tunnel, arranging MJS jump hole pipes, installing a reinforcing device and carrying out MJS jump hole reinforcing construction. The invention takes the longitudinal axis of the tunnel of the operation line as a reference, the same hole sites are added at the radial symmetrical positions of the original hole sites at the other side, two opposite hole sites are drilled simultaneously, and the MJS construction method piles are constructed by jumping piles in sequence, so that the MJS construction generates equivalent stress change on the two sides, the quality requirement of reinforcement is met, the basic construction process of the MJS construction method piles is not changed, the cavity is operable, the popularization is easy, and the construction safety coefficient is high.)

1. An MJS jump hole symmetrical reinforcement construction method is characterized by comprising the following steps:

1) operation line tunnel cleaning

a. Firstly, cleaning an operation line tunnel, and determining the range of MJS jump hole construction along the inner wall of the operation line tunnel;

b. then horizontally installing two mutually parallel rails along the bottom of the operation line tunnel, and supporting the reinforcing device through the rails;

2) MJS jump hole pipe layout

a. After the operating line tunnel is cleaned, the MJS jump hole pipes are arranged according to the outer side of the tunnel, and the MJS jump hole pipes are arranged according to an inner layer and an outer layer;

b. then, arranging corresponding guniting interfaces along the inner wall of the tunnel according to the position of the hole jump pipe on each layer, and enabling the guniting interfaces to be communicated with the hole jump pipes;

3) mounting of reinforcement means

a. Firstly, processing a corresponding supporting plate according to design requirements, vertically and symmetrically installing upright posts along the bottom surface of the supporting plate, installing a protective net between two adjacent upright posts on the same side, enabling the distance between two opposite upright posts to be equal to the distance between two tracks, and installing a roller at the bottom of each supporting column;

b. then, a storage box is arranged along the top surface of the supporting plate, and a slurry conveying pump is arranged on the storage box;

c. then, processing a corresponding support according to design requirements, symmetrically installing first hydraulic cylinders along the top surface of the supporting plate, and connecting the support with the first hydraulic cylinders through first piston rods;

d. finally, determining the size of the cantilever assembly according to the arrangement position of the MJS jump hole pipe, processing the corresponding cantilever assembly, mounting the cantilever assembly on a bracket, respectively mounting a spray head on each cantilever assembly, connecting the cantilever assembly with a support plate through a fastening assembly, and connecting the spray heads with a slurry conveying pump through a slurry conveying pipe;

4) MJS jump hole reinforcement construction

a. Firstly, placing a processed reinforcing device on a track, injecting required slurry into a storage tank, and pulling the reinforcing device to a position of MJS jump hole construction along the track by a tractor;

b. then moving the spray head to a required position along the cantilever assembly according to the position of each MJS jump hole pipe and then fixing the spray head;

c. starting a first hydraulic cylinder to enable a first piston rod to drive the cantilever assembly to rise to a set height position, starting second hydraulic cylinders on two sides of the supporting plate to enable a second piston rod to drive the cantilever assembly to be close to the inner surface of the tunnel, and enabling the spray head to be aligned to and close to the interface position of the corresponding MJS jump hole pipe until the spray head is completely attached;

d. finally, a slurry conveying pump is started, so that the slurry in the storage tank is conveyed to the spray heads through the slurry conveying pipe under the action of the slurry conveying pump, the spraying sequence of the spray heads is controlled, the grouting reinforcement construction of the inner MJS jump hole pipe is firstly carried out, then the grouting reinforcement construction of the outer MJS jump hole pipe is carried out, when the inner MJS construction method pile is poured, construction is carried out according to the sequence along 1a-2a, 3a-4a, 5a-6a, 7a-8a, 9a-10a, 11a-12a and 13a-14a, the inner MJS construction method pile adopts 180-degree half-spraying, then grouting reinforcement construction of the outer MJS jump hole pipe is carried out, when the outer MJS construction method piles are poured, construction is carried out according to the sequence along 15b-16b, 17b-18b, 19b-20b, 21b-22b, 23b-24b and 25b-26b, and the outer MJS construction method piles are overlapped in a full circle of 360 degrees;

e. and after the construction is finished, removing the reinforcing device, and disassembling and cleaning.

2. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 1, wherein: the cantilever assembly comprises arc-shaped guide rails, seven arc-shaped guide rails are arranged on the support at equal intervals along the horizontal direction, the spray head is connected to the arc-shaped guide rails in a sliding mode, limiting grooves are formed in the outer circumferential side faces of the arc-shaped guide rails, and through grooves are formed in the limiting grooves.

3. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 2, wherein: the arc-shaped guide rail is of a semicircular structure.

4. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 2, wherein: the sprayer comprises a base plate and a nozzle, the nozzle is arranged at the top end of the base plate, a flow guide pipe is arranged in the nozzle and the base plate and communicated with the slurry conveying pipe, a driving mechanism is arranged on the base plate, and the bottom of the base plate is connected with the through groove through a limiting assembly.

5. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 4, wherein: the honeycomb duct is provided with a one-way valve.

6. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 4, wherein: the driving mechanism comprises a motor and guide wheels, the motor is arranged in the substrate, the motor is connected with the guide wheels, the guide wheels are located on two sides of the substrate, and the guide wheels are limited in clamping grooves on two sides of the limiting groove.

7. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 4, wherein: the limiting assembly comprises an auxiliary wheel, the auxiliary wheel is arranged below the substrate through a connecting rod, and the connecting rod penetrates through the through groove.

8. The MJS jump hole symmetrical reinforcement construction method as claimed in claim 1, wherein: the fastening assembly comprises a second hydraulic cylinder and a second piston rod, the second hydraulic cylinder is arranged on the side face of the supporting plate, and the second hydraulic cylinder is connected with the cantilever assembly through the second piston rod.

Technical Field

The invention relates to an MJS jump hole symmetrical reinforcement construction method.

Background

With the rapid development of national economy, many large and medium-sized cities in China build subways to relieve traffic pressure. The subway is deeply loved by the citizens due to the characteristics of rapidness, convenience and punctuality. Meanwhile, as the living pressure of city centers increases, a plurality of satellite cities are generated, and one of the best modes of the satellite cities and main urban areas is to build subways. Therefore, important structures such as high-speed rails, tall buildings and national cultural relics protection heritage can be inevitably worn, and the requirements of the structures on surface subsidence are very high. At present, the MJS method is mainly adopted for construction, and MJS horizontal rotary spraying cement mortar is used for solidifying soil around a shield section around a shield tunnel of a lower-passing section during construction so as to reduce the ground surface settlement amount when the shield passes through a building and avoid causing adverse effects on the building.

When the operation line is in MJS construction, due to the fact that the requirement of the operation subway shield tunnel on structural deformation is extremely high, stress release caused by construction of the close MJS construction method piles can cause deformation or displacement overrun of shield segments of the operation line even if soil displacement is small.

The MJS-method pile is frequently used in projects with complex surrounding environment and strict deformation control requirements, the pile forming process is also continuously perfect, but the difficulty of controlling the deformation within 5mm is extremely high.

Disclosure of Invention

The invention aims to provide a technical scheme of an MJS jump hole symmetrical reinforcing construction method aiming at the defects in the prior art, the construction method takes the longitudinal axis of an operation line tunnel as a reference, the same hole sites are added at the positions corresponding to the original hole sites on the other side in a radial symmetry manner, two opposite hole sites are drilled simultaneously, and the MJS construction method piles are constructed by jumping piles in sequence, so that the equivalent stress change of the MJS construction on the two sides is realized, the reinforcing quality requirement is met, the basic construction process of the MJS construction method piles is not changed, the cavity is operable, the popularization is easy, and the construction safety coefficient is high.

In order to solve the technical problems, the invention adopts the following technical scheme:

an MJS jump hole symmetrical reinforcement construction method is characterized by comprising the following steps:

1) operation line tunnel cleaning

a. Firstly, an operation line tunnel is cleaned, and the range of MJS jump hole construction is determined along the inner wall of the operation line tunnel, which is beneficial to improving the quality of the whole construction;

b. then horizontally installing two mutually parallel rails along the bottom of the operation line tunnel, and supporting the reinforcing device through the rails;

2) MJS jump hole pipe layout

a. After the operating line tunnel is cleaned, the MJS jump hole pipes are arranged according to the outer side of the tunnel, and the MJS jump hole pipes are arranged according to an inner layer and an outer layer;

b. then, arranging corresponding guniting interfaces along the inner wall of the tunnel according to the position of the hole jump pipe on each layer, and enabling the guniting interfaces to be communicated with the hole jump pipes;

3) mounting of reinforcement means

a. Firstly, processing a corresponding supporting plate according to design requirements, vertically and symmetrically installing upright posts along the bottom surface of the supporting plate, installing a protective net between two adjacent upright posts on the same side, enabling the distance between two opposite upright posts to be equal to the distance between two tracks, and installing a roller at the bottom of each supporting column;

b. then, a storage box is arranged along the top surface of the supporting plate, and a slurry conveying pump is arranged on the storage box;

c. then, processing a corresponding support according to design requirements, symmetrically installing first hydraulic cylinders along the top surface of the supporting plate, and connecting the support with the first hydraulic cylinders through first piston rods;

d. finally, determining the size of the cantilever assembly according to the arrangement position of the MJS jump hole pipe, processing the corresponding cantilever assembly, mounting the cantilever assembly on a bracket, respectively mounting a spray head on each cantilever assembly, connecting the cantilever assembly with a support plate through a fastening assembly, and connecting the spray heads with a slurry conveying pump through a slurry conveying pipe;

4) MJS jump hole reinforcement construction

a. Firstly, placing a processed reinforcing device on a track, injecting required slurry into a storage tank, and pulling the reinforcing device to a position of MJS jump hole construction along the track by a tractor;

b. then moving the spray head to a required position along the cantilever assembly according to the position of each MJS jump hole pipe and then fixing the spray head;

c. starting a first hydraulic cylinder to enable a first piston rod to drive the cantilever assembly to rise to a set height position, starting second hydraulic cylinders on two sides of the supporting plate to enable a second piston rod to drive the cantilever assembly to be close to the inner surface of the tunnel, and enabling the spray head to be aligned to and close to the interface position of the corresponding MJS jump hole pipe until the spray head is completely attached;

d. finally, a slurry conveying pump is started, so that the slurry in the storage tank is conveyed to the spray heads through the slurry conveying pipe under the action of the slurry conveying pump, the spraying sequence of the spray heads is controlled, the grouting reinforcement construction of the inner MJS jump hole pipe is firstly carried out, then the grouting reinforcement construction of the outer MJS jump hole pipe is carried out, when the inner MJS construction method pile is poured, construction is carried out according to the sequence along 1a-2a, 3a-4a, 5a-6a, 7a-8a, 9a-10a, 11a-12a and 13a-14a, the inner MJS construction method pile adopts 180-degree half-spraying, then grouting reinforcement construction of the outer MJS jump hole pipe is carried out, when the outer MJS construction method piles are poured, construction is carried out according to the sequence along 15b-16b, 17b-18b, 19b-20b, 21b-22b, 23b-24b and 25b-26b, and the outer MJS construction method piles are overlapped in a full circle of 360 degrees;

e. and after the construction is finished, removing the reinforcing device, and disassembling and cleaning.

The construction method takes the longitudinal axis of the operation line tunnel as a reference, the same hole sites are added at the positions of the other side corresponding to the original hole sites in radial symmetry, two opposite hole sites are drilled simultaneously, and the MJS construction method piles are constructed by jumping piles in sequence, so that the MJS construction generates equivalent stress change on the two sides, the quality requirement of reinforcement is met, the basic construction process of the MJS construction method piles is not changed, the operation cavity is easy to popularize, and the construction safety coefficient is high.

Furthermore, the cantilever assembly comprises arc-shaped guide rails, seven arc-shaped guide rails are arranged on the bracket at equal intervals along the horizontal direction, the spray head is connected to the arc-shaped guide rails in a sliding manner, the side surface of the outer circumference of each arc-shaped guide rail is provided with a limiting groove, and the limiting groove is provided with a through groove; through the design of arc guide rail, can make the shower nozzle remove along the arc guide rail, satisfy and carry out the slip casting to the MIS jump hole pipe of difference and consolidate, reduced manual operation's intensity of labour, improved the efficiency of slip casting simultaneously, spacing groove and bucket groove are used for spacing the shower nozzle, stability and reliability when improving slip casting.

Furthermore, the arc-shaped guide rail is of a semicircular structure, the nozzle can move along the arc-shaped guide rail due to the semicircular structure, grouting for different MJS jump hole pipes is met, and flexibility and reliability in use are improved.

Further, the shower nozzle includes base plate and nozzle, and the top of base plate is located to the nozzle, is provided with the honeycomb duct in nozzle and the base plate, and the defeated thick liquid pipe of honeycomb duct intercommunication is provided with actuating mechanism on the base plate, and spacing subassembly connection through groove is passed through to the bottom of base plate, and the mud in the storage case can be carried to the honeycomb duct through defeated thick liquid pipe to carry to MJS jump downthehole, actuating mechanism can drive the shower nozzle and remove along the arc guide rail, satisfies the needs of actual spraying.

Furthermore, the guide pipe is provided with a one-way valve which can control the opening and closing of the guide pipe, the requirement of MJS hole jumping construction is met, and the control precision is high.

Further, actuating mechanism includes motor and leading wheel, and the motor is located the base plate in, and the leading wheel is connected to the motor, and the leading wheel is located the both sides of base plate, and the leading wheel is spacing in the draw-in groove of spacing groove both sides, drives the leading wheel rotation through the motor, can make the leading wheel drive shower nozzle remove along arc guide.

Further, spacing subassembly includes the auxiliary wheel, and the auxiliary wheel passes through the connecting rod and locates the below of base plate, and the connecting rod runs through logical groove, through the design of auxiliary wheel and connecting rod, stability and reliability when can improving the shower nozzle and remove, and then stability when improving defeated thick liquid avoids spilling over from the shower nozzle.

Furthermore, the fastening components comprise a second hydraulic cylinder and a second piston rod, the second hydraulic cylinder is arranged on the side face of the supporting plate, the second hydraulic cylinder is connected with the cantilever component through the second piston rod, the second piston rod can be driven to move through the second hydraulic cylinder, the cantilever component is supported, and stability and reliability during grouting are improved.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the construction method of the invention takes the longitudinal axis of the operation line tunnel as a reference, the same hole sites are added at the positions of the other side corresponding to the original hole sites in radial symmetry, two opposite hole sites are drilled simultaneously, and the piles are jumped in sequence to construct the MJS construction method piles, so that the MJS construction generates equivalent stress change on the two sides, the quality requirement of reinforcement is met, the basic construction process of the MJS construction method piles is not changed, the operation cavity is easy to popularize, and the construction safety coefficient is high.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a hole jump construction diagram in the MJS hole jump symmetrical reinforcement construction method of the invention;

FIG. 2 is a schematic view of the installation of the reinforcement device of the present invention;

FIG. 3 is a schematic view of the connection between the bracket and the support plate according to the present invention;

FIG. 4 is a schematic view of the connection between the cantilever assembly and the bracket according to the present invention;

FIG. 5 is a schematic structural view of the arcuate rail of the present invention;

fig. 6 is a schematic structural view of the head of the present invention.

In the figure: 1-an operation line tunnel; 3-a cantilever assembly; 4-orbit; 5-a spray head; 6-a first hydraulic cylinder; 7-a first piston rod; 8-a second hydraulic cylinder; 9-a second piston rod; 10-a support plate; 11-upright post; 12-a roller; 13-protective screening; 14-a storage bin; 15-slurry conveying pump; 16-a pulp conveying pipe; 17-a scaffold; 18-an arcuate guide rail; 19-a limit groove; 20-through grooves; 21-a substrate; 22-a nozzle; 23-a flow guide pipe; 24-a one-way valve; 25-a motor; 26-a guide wheel; 27-auxiliary wheel.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terms first, second and the like in the description and in the claims, and in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

As shown in fig. 1 to 6, the MJS jump hole symmetrical reinforcement construction method of the present invention includes the following steps:

1) cleaning of operation line tunnel 1

a. Firstly, cleaning an operation line tunnel 1, and determining the range of MJS jump hole construction along the inner wall of the operation line tunnel 1, which is beneficial to improving the quality of the whole construction;

b. then horizontally installing two mutually parallel rails 4 along the bottom of the operation line tunnel 1, and supporting the reinforcing device through the rails 4;

2) MJS jump hole pipe layout

a. After the operating line tunnel 1 is cleaned, the MJS jump hole pipes are arranged according to the outer side of the tunnel, and the MJS jump hole pipes are arranged according to an inner layer and an outer layer;

b. then, arranging corresponding guniting interfaces along the inner wall of the tunnel according to the position of the hole jump pipe on each layer, and enabling the guniting interfaces to be communicated with the hole jump pipes;

3) mounting of reinforcement means

a. Firstly, processing a corresponding supporting plate 10 according to design requirements, vertically and symmetrically installing upright posts 11 on the bottom surface of the supporting plate 10, installing a protective net 13 between two adjacent upright posts 11 on the same side, enabling the distance between two opposite upright posts 11 to be equal to the distance between two tracks 4, and installing a roller 12 at the bottom of each supporting column;

b. then installing a storage tank 14 along the top surface of the support plate 10, and installing a slurry conveying pump 15 on the storage tank 14;

c. then, processing a corresponding bracket 17 according to design requirements, symmetrically installing first hydraulic cylinders 6 along the top surface of the support plate 10, and connecting the bracket 17 with the first hydraulic cylinders 6 through first piston rods 7;

d. finally, the size of the cantilever assembly 3 is determined according to the arrangement position of the MJS jump hole pipe, the corresponding cantilever assembly 3 is processed, the cantilever assembly 3 is installed on a support 17, a spray head 5 is respectively installed on each cantilever assembly 3, the cantilever assembly 3 is connected with a support plate 10 through a fastening assembly, and the spray head 5 is connected with a slurry conveying pump 15 through a slurry conveying pipe 16;

the cantilever assembly 3 comprises arc-shaped guide rails 18, seven arc-shaped guide rails 18 are arranged on a support 17 at equal intervals along the horizontal direction, the spray head 5 is connected to the arc-shaped guide rails 18 in a sliding manner, limiting grooves 19 are formed in the side surfaces of the outer circumferences of the arc-shaped guide rails 18, and through grooves 20 are formed in the limiting grooves 19; through the design of arc guide 18, can make shower nozzle 5 remove along arc guide 18, satisfy and carry out the slip casting to the MIS jump hole pipe of difference and consolidate, reduced manual operation's intensity of labour, improved the efficiency of slip casting simultaneously, spacing groove 19 and bucket groove are used for spacing shower nozzle 5, stability and reliability when improving slip casting.

The arc-shaped guide rail 18 is of a semicircular structure, the nozzle 5 can move along the arc-shaped guide rail 18 due to the semicircular structure, grouting for different MJS jump hole pipes is met, and flexibility and reliability in use are improved.

Shower nozzle 5 includes base plate 21 and nozzle 22, nozzle 22 locates the top of base plate 21, be provided with honeycomb duct 23 in nozzle 22 and the base plate 21, honeycomb duct 23 communicates defeated thick liquid pipe 16, be provided with actuating mechanism on the base plate 21, spacing subassembly connection through groove 20 is passed through to the bottom of base plate 21, mud in the storage case 14 can be carried to honeycomb duct 23 through defeated thick liquid pipe 16, and carry to the MJS jump downthehole intraductal, actuating mechanism can drive shower nozzle 5 and remove along arc guide rail 18, satisfy the needs of actual spraying.

The honeycomb duct 23 is provided with the check valve 24, and the check valve 24 can control the opening and closing of the honeycomb duct 23, so that the requirement of MJS jump hole construction is met, and the control precision is high.

The driving mechanism comprises a motor 25 and a guide wheel 26, the motor 25 is arranged in the substrate 21, the motor 25 is connected with the guide wheel 26, the guide wheel 26 is positioned on two sides of the substrate 21, the guide wheel 26 is limited in clamping grooves on two sides of the limiting groove 19, the guide wheel 26 is driven to rotate through the motor 25, and the guide wheel 26 can drive the spray head 5 to move along the arc-shaped guide rail 18.

Spacing subassembly includes auxiliary wheel 27, and auxiliary wheel 27 locates the below of base plate 21 through the connecting rod, and the connecting rod runs through logical groove 20, through the design of auxiliary wheel 27 and connecting rod, stability and reliability when can improving shower nozzle 5 and remove, and then stability when improving defeated thick liquid avoids spilling over from shower nozzle 5.

The fastening components comprise a second hydraulic cylinder 8 and a second piston rod 9, the second hydraulic cylinder 8 is arranged on the side face of the supporting plate 10, the second hydraulic cylinder 8 is connected with the cantilever component 3 through the second piston rod 9, the second piston rod 9 can be driven to move through the second hydraulic cylinder 8, the cantilever component 3 is supported, and stability and reliability during grouting are improved.

4) MJS jump hole reinforcement construction

a. Firstly, placing a processed reinforcing device on a track 4, injecting required slurry into a storage tank 14, and pulling the reinforcing device to a position of MJS jump hole construction along the track 4 by a tractor;

b. then, moving the spray head 5 to a required position along the cantilever assembly 3 according to the position of each MJS jump hole pipe and fixing the spray head;

c. then starting the first hydraulic cylinder 6 to enable the first piston rod 7 to drive the cantilever assembly 3 to rise to a set height position, then starting the second hydraulic cylinders 8 on two sides of the supporting plate 10 to enable the second piston rods 9 to drive the cantilever assembly 3 to be close to the inner surface of the tunnel, and enabling the spray head 5 to be aligned to and close to the interface position of the corresponding MJS jump hole pipe until the joint is completely attached;

d. and finally, starting a slurry conveying pump 15, conveying the slurry in the storage tank 14 to the spray head 5 through a slurry conveying pipe 16 under the action of the slurry conveying pump 15, controlling the spraying sequence of the spray head 5, firstly carrying out grouting reinforcement construction on the inner MJS jump hole pipe, then carrying out grouting reinforcement construction on the outer MJS jump hole pipe, carrying out construction along the sequence of 1a-2a, 3a-4a, 5a-6a, 7a-8a, 9a-10a, 11a-12a and 13a-14a when pouring the inner MJS construction method pile, carrying out 180-degree half-spraying on the inner MJS construction method pile, then carrying out grouting reinforcement construction on the outer MJS jump hole pipe, and carrying out construction along the sequence of 15b-16b, 17b-18b, 19b-20b, 21b-22b, 23b-24b and 25b-26b when pouring the outer MJS construction method pile, the outer MJS construction method piles are in full circle lap joint of 360 degrees;

e. and after the construction is finished, removing the reinforcing device, and disassembling and cleaning.

The construction method takes the longitudinal axis of the operation line tunnel 1 as a reference, the same hole sites are added at the positions of the other side corresponding to the original hole sites in radial symmetry, two opposite hole sites are drilled simultaneously, and the MJS construction method piles are constructed by jumping piles in sequence, so that the MJS construction generates equivalent stress change on the two sides, the quality requirement of reinforcement is met, the basic construction process of the MJS construction method piles is not changed, the operation cavity is easy to popularize, and the construction safety coefficient is high.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple variations, equivalent substitutions or modifications based on the present invention to achieve substantially the same technical effects are within the scope of the present invention.