CN114526096A

CN114526096A - Pipe curtain steel pipe, supporting structure and pipe curtain method supporting construction method

Info

Publication number: CN114526096A
Application number: CN202210084940.8A
Authority: CN
Inventors: 宋鹏杰; 吴红兵; 李增良; 梁缄鑫; 马万里; 胡立正
Original assignee: China Railway 20th Bureau Group South Engineering Co Ltd
Current assignee: China Railway 20th Bureau Group South Engineering Co Ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-24

Abstract

The invention discloses a pipe curtain steel pipe which comprises a supporting steel pipe, wherein a fixing groove is formed in one side of the supporting steel pipe, a fixing strip matched with the fixing groove is fixed at the corresponding position of the other side of the supporting steel pipe, and the fixing strip and the fixing groove are arranged along the axial direction of the supporting steel pipe; the supporting steel pipes are fixed by inserting the fixing strips into the fixing grooves. One effect of the invention is as follows: the pipe curtain steel pipe is only provided with bellied fixed strip in one side, and at the in-process that inserts the fixed slot with the fixed strip, the drill bit of pipe curtain steel pipe front end can not touch with the fixed strip of adjacent pipe curtain steel pipe, makes beating of pipe curtain steel pipe establish more reliably smooth and easy, and efficiency is higher, and the security is also higher.

Description

Pipe curtain steel pipe, supporting structure and pipe curtain method supporting construction method

Technical Field

The invention relates to the field of building construction, in particular to a pipe curtain steel pipe, a supporting structure and a pipe curtain method supporting construction method.

Background

The pipe curtain method is a commonly used advanced support method when a large-section underground tunnel is excavated, and has the advantage that a large tunnel with a complex section can be built by using miniaturized equipment.

The method mainly comprises the steps that steel pipes are sequentially and transversely driven into a section, lock catches are welded on two sides of each steel pipe along the axial direction of the steel pipe, the steel pipes are connected through the lock catches, after the steel pipes are spliced into a pipe curtain in an annular structure, concrete is poured into the steel pipes, the middle of the pipe curtain is excavated, and concrete support is timely sprayed into the excavated tunnel until the construction of the tunnel is completed.

However, the construction of the pipe curtain method is complicated, and because the steel pipe needs to be penetrated with a drill rod during pushing, the accuracy of the jacking angle of the steel pipe is ensured by drilling and pushing, a drill bit is easy to touch a lock catch of an adjacent steel pipe during the jacking process, so that the drill bit is damaged or blocked; and annular pipe curtain often is very difficult in the arrangement of last steel pipe, can cause the position of last steel pipe to be on the small side or on the large side because of the installation error of both sides steel pipe, leads to extremely strict to the construction precision requirement, influences the construction progress.

Therefore, a new structure or construction method for supporting by a tube curtain method is required, which can solve the above problems.

Disclosure of Invention

The invention aims to provide a new technical scheme for supporting construction by a pipe curtain method.

According to a first aspect of the invention, a pipe curtain steel pipe is provided, which comprises a support steel pipe, wherein one side of the support steel pipe is provided with a fixing groove, a fixing strip matched with the fixing groove is fixed at a corresponding position on the other side of the support steel pipe, and the fixing strip and the fixing groove are arranged along the axial direction of the support steel pipe; the supporting steel pipes are fixed by inserting the fixing strips into the fixing grooves.

Through this scheme, the pipe curtain steel pipe only is provided with bellied fixed strip in one side, and at the in-process that inserts the fixed strip fixed slot, the drill bit of pipe curtain steel pipe front end can not touch with the fixed strip of adjacent pipe curtain steel pipe, makes beating of pipe curtain steel pipe establish more reliably smooth and easy, and efficiency is higher, and the security is also higher.

Preferably, the steel tube support further comprises a reference steel tube, reference grooves are formed in two sides of the reference steel tube, and the fixing strips can be inserted into the reference grooves to enable the support steel tube to be fixedly connected with the reference steel tube.

Through this scheme, the benchmark steel pipe is as middle benchmark, beats to both sides from the centre and establishes the support steel pipe, can reduce the error accumulation of pipe curtain setting-up in-process to convenient beating of pipe curtain steel pipe is established, helps improving the efficiency of construction.

Preferably, the fixing groove and the reference groove are opened only at the rear end of the tube curtain steel tube; the cross section of the fixing strip is of a T-shaped structure.

Through this scheme, the fixed strip can insert through the opening of fixed slot or benchmark groove rear end, and the front end in fixed slot and benchmark groove is not the opening and can be kept the intensity of pipe curtain steel pipe front end, avoids the crooked damage of pipe jacking in-process.

Preferably, the rear end of the fixing strip is provided with a hooping groove, the rear end of the pipe curtain steel pipe is fixed with a hoop, and the size of the hooping groove is matched with the hoop.

By the scheme, the anchor ear can stably strengthen the rear end of the pipe curtain steel pipe, and damage caused by overlarge mutual pulling force or internal pressure after connection and grouting is avoided; the hooping groove can allow the hoop to pass through, and the phenomenon that the hoop is damaged due to overlarge local pressure caused by directly tightly holding the fixing strip is avoided.

Preferably, the front end of the fixing strip is provided with a propelling part which is obliquely arranged towards the outer wall of the support steel pipe.

Through this scheme, before the pipe curtain steel pipe is squeezed into, in order to avoid earth admission pipe, can insert interim support bar in the fixed slot, propulsion portion can push interim support bar during the fixed slot is inserted to the fixed slot, conveniently takes off interim support bar and carries out the slip casting processing.

According to a second aspect of the invention, a supporting structure adopting the pipe curtain steel pipe comprises a pipe curtain surrounding a tunnel and a concrete layer, wherein the pipe curtain is formed by arranging a plurality of pipe curtain steel pipes, the pipe curtain is of a semi-surrounding structure and is arranged above the tunnel, and the concrete layer is supported on the inner wall of the tunnel and the bottom surface of the pipe curtain; the pipe curtain includes the benchmark steel pipe of intermediate position and is connected to a plurality of support steel pipes of benchmark steel pipe both sides, it fills with the concrete in the pipe curtain steel pipe, the outer end of pipe curtain steel pipe all is fixed with the staple bolt.

Through this scheme, the pipe curtain of half surrounding structure only supports to the tunnel top, because the pipe curtain need not to be cyclic annular and arranges, the required precision is low, under the prerequisite of having guaranteed the support performance, greatly reduced the construction degree of difficulty and engineering time, need not to consider the position precision and the reserve of last piece from the middle to the construction of both sides moreover, and efficiency is higher, and the security is also higher.

According to a third aspect of the present invention, there is provided a pipe-roof method supporting construction method using the above pipe-roof method supporting structure, including the steps of:

the method comprises the following steps: inserting a drill rod into the reference steel pipe, enabling the drill bit to be exposed out of the front end of the reference steel pipe for drilling, and driving the reference steel pipe into the middle position of a pipe curtain to be formed by using a pushing machine;

step two: inserting a drill rod into the supporting steel pipe to enable the drill bit to be exposed out of the front end of the supporting steel pipe for drilling, sequentially driving the supporting steel pipe towards two sides by using a pushing machine with the reference steel pipe as the center, enabling the fixing strips to be inserted into the fixing grooves or the reference grooves of the adjacent pipe curtain steel pipes, and after the pipe curtain steel pipes are driven, grouting into the pipe curtain steel pipes to form a pipe curtain with a semi-enclosed structure;

step three: dividing the position of a tunnel to be excavated into a plurality of subareas, excavating the subareas in sequence, and performing primary support after the excavation of each subarea is finished;

step four: and after all the subareas are excavated and primary supports are carried out, removing redundant primary supports, laying a waterproof layer and applying a second lining.

Preferably, in the first step and the second step, the temporary support bar is inserted into the fixing groove and the reference groove, so that the temporary support bar is in interference fit with the fixing groove or the reference groove; in the inserting process of the fixing strips, the temporary supporting strips are extruded into the pipe curtain steel pipes by the pushing parts, and grouting is performed after the temporary supporting strips are taken out.

Preferably, in the second step, after the fixing strip is completely inserted into the fixing groove or the reference groove of the previous tube curtain steel tube, the rear end of the previous tube curtain steel tube is hooped by the hoop, and then the next tube curtain steel tube is arranged.

Preferably, in the third step, the method for performing preliminary bracing after the divided excavation is completed is: erecting a grid steel frame on the inner wall of the tunnel, drilling a foot locking anchor pipe, spraying primary concrete, and erecting a middle partition wall on one side of each partition, which is far away from the inner wall of the tunnel; and the step four of dismantling the redundant primary support is to dismantle a middle partition wall.

According to an embodiment of the disclosure, the pipe curtain method supporting structure or the supporting construction method can greatly improve the construction efficiency, reduce the construction difficulty and greatly reduce the construction cost on the premise of ensuring the supporting strength.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic view of a connection structure of tube sheet steel tubes according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure view of the pipe curtain steel pipe in fig. 1.

Fig. 3 is a schematic view of a cross-sectional structure of the support of fig. 2 in an axial direction.

Fig. 4 is a schematic view of the position of the hoop in the tube curtain steel tube in fig. 2.

Fig. 5 is a schematic structural view of a supporting structure using the tube-sheet steel tube in fig. 1.

Fig. 6 is a schematic structural view of the positions of the partitions in the pipe-curtain-method support construction method according to the second embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Example one

As shown in fig. 1 to 4, the tube curtain steel tube 110 in this embodiment includes a support steel tube 112, a fixing groove 131 is formed on one side of the support steel tube 112, a fixing strip 120 matching with the fixing groove 131 is fixed at a corresponding position on the other side of the support steel tube 112, and both the fixing strip 120 and the fixing groove 131 are arranged along an axial direction of the support steel tube 112; the support steel pipes 112 are fixed by inserting the fixing bars 120 into the fixing grooves 131.

Through this scheme of this embodiment, the pipe curtain steel pipe 110 is only provided with bellied fixed strip 120 in one side, and at the in-process with fixed strip 120 insert fixed slot 131, the drill bit of pipe curtain steel pipe 110 front end can not touch with the fixed strip 120 of adjacent pipe curtain steel pipe 110, makes beating of pipe curtain steel pipe 110 establish more reliably smoothly, and efficiency is higher, and the security is also higher.

In this embodiment or other embodiments, the steel tube assembly further includes a reference steel tube 111, reference grooves 132 are formed in both sides of the reference steel tube 111, and the fixing bar 120 can be inserted into the reference grooves 132 to fixedly connect the support steel tube 112 and the reference steel tube 111. The reference steel pipe 111 is used as the middle reference of the pipe curtain, and the support steel pipes 112 are arranged from the middle to the two sides, so that the error accumulation in the pipe curtain arrangement process can be reduced, the arrangement of the pipe curtain steel pipe 110 is convenient, and the construction efficiency is improved.

In this embodiment or other embodiments, the fixing groove 131 and the reference groove 132 are opened only at the rear end of the tube curtain steel tube 110; the cross section of the fixing strip 120 is a T-shaped structure. The fixing bar 120 can be inserted through the fixing groove 131 and the opening at the rear end of the reference groove 132, and the front ends of the fixing groove 131 and the reference groove 132 are closed to maintain the integrity of the front end of the tube curtain steel tube 110, so that the strength of the front end of the tube curtain steel tube is maintained, and the bending damage during the tube jacking process is avoided.

The fixing strip of "T" shape can keep the locking state after inserting fixed slot 131, improves the intensity and the stability of connecting between pipe curtain steel pipe 110, can play the effect of shutoff fixed slot 131 and benchmark groove 132 moreover, makes things convenient for going on of slip casting operation.

In this embodiment or other embodiments, the rear end of the fixing strip 120 is provided with a hoop groove 122, the rear ends of the tube curtain steel tubes 110 are fixed with hoops 140, and the hoop groove 122 is matched with the hoops 140 in size. The anchor ear 140 can stably reinforce the rear end of the pipe curtain steel pipe 110, and avoid deformation and damage caused by excessive tension or internal pressure after connection and grouting; the hoop groove 122 can allow the hoop 140 to pass through, so that the hoop directly contacts with the tube body of the tube curtain steel tube 110, and the damage of the hoop 140 due to the excessive local pressure caused by the raised fixing strip 120 is avoided.

In this embodiment or other embodiments, the front end of the fixing strip 120 is provided with the propelling part 121, the propelling part 121 is arranged towards the outer wall of the supporting steel pipe 112 in an inclined manner, before the pipe curtain steel pipe 110 is driven into the pipe, in order to avoid soil from entering the pipe, and improve the strength of the pipe curtain steel pipe 110 during pipe-jacking operation, the temporary supporting strip 133 can be inserted into the fixing groove 131, the propelling part 121 can push the temporary supporting strip 133 into the pipe curtain steel pipe 110 when the fixing strip 120 is inserted into the fixing groove 131, the dropped temporary supporting strip 133 facilitates recovery processing, and grouting processing is further performed.

The temporary support bars 133 in this embodiment are made of steel or wood, for example, and are press-fitted into the fixing grooves 131 to be fixed by pressing, so that the temporary support bars can be separated from the fixing grooves 131 by the thrust of the pushing part 121 and fall into the tube-curtain steel tube.

As shown in fig. 5, the supporting structure in this embodiment includes a tube sheet 100 surrounding a tunnel and a main supporting layer 200, wherein the tube sheet 100 is formed by arranging a plurality of tube sheet steel tubes 110, the tube sheet 100 is a semi-surrounding structure and is disposed above the tunnel 300, and the main supporting layer 200 supports the inner wall of the tunnel 300 and the bottom surface of the tube sheet 100; the tube curtain steel tube 110 comprises a reference steel tube 111 at the middle position and support steel tubes 112 at two sides of the reference steel tube 111, reference grooves 132 are formed in two sides of the reference steel tube 111, fixing grooves 131 are formed in one side of the support steel tube 112, fixing strips 120 matched with the fixing grooves 131 are fixed at corresponding positions on the other side of the support steel tube 112, the sizes of the reference grooves 132 and the fixing grooves 131 are the same, and the fixing strips 120 and the fixing grooves 131 are arranged along the axial direction of the tube curtain steel tube 110; the tube curtain steel tubes 110 are fixed by inserting the fixing bars 120 into the fixing grooves 131 or the reference grooves 132.

According to the scheme of the embodiment, the pipe curtain 100 of the semi-surrounding structure is only supported above the tunnel 300, and as the pipe curtain 100 does not need to be annularly arranged, the precision requirement is low, and a precise space does not need to be reserved due to the insertion of the last steel pipe; moreover, after the middle reference steel pipe 111 is arranged, the support steel pipes 112 are arranged by extending towards the two sides, so that the construction is further facilitated, the position precision of each steel pipe is not required to be considered, and the construction difficulty and the construction time are greatly reduced on the premise of ensuring the support performance;

the pipe curtain steel pipe 110 is only provided with the bellied fixed strip 120 in one side, and at the in-process with the fixed strip 120 inserts the fixed slot 131, the drill bit of pipe curtain steel pipe 110 front end can not touch with the fixed strip 120 of adjacent pipe curtain steel pipe 110, makes beating of pipe curtain steel pipe 110 establish more reliably smoothly, can not appear the condition that the card bored, broken drill, fixed strip 120 damaged, and the efficiency of construction is higher, and the security is also higher.

The primary support 200 in this embodiment protects the primary supports 210 and the waterproof layer 220, wherein the primary supports 210 are mainly grid steel frames and are formed by injecting primary concrete after the anchor pipes are arranged.

According to the embodiment, the pipe curtain method supporting structure or the supporting construction method is used, on the premise that the supporting strength is guaranteed, the construction efficiency can be greatly improved, the construction difficulty is reduced, and the construction cost can be greatly reduced.

Example two

The pipe curtain method supporting construction method adopting the pipe curtain method supporting structure in the embodiment comprises the following steps:

the method comprises the following steps: selecting a plurality of steel pipes, welding and fixing a T-shaped fixing strip on one side of each steel pipe, and arranging a fixing groove at a corresponding position on the other side of each steel pipe, so that the width of each fixing groove can allow the fixing strip to be inserted and locked, and the preparation of the support steel pipe is completed;

select the steel pipe of a same specification, set up the benchmark groove respectively in the relevant position of both sides, accomplish the preparation of benchmark steel pipe, fill respectively in benchmark groove and fixed slot temporary support bar, temporary support bar and benchmark groove and fixed slot interference fit carry out interim fixing through frictional force, make the side of temporary support bar with the outer wall of pipe curtain steel pipe flushes to reduce the resistance between push pipe operation in-process and the earth.

Inserting a drill rod into the reference steel pipe, enabling the drill bit to be exposed out of the front end of the reference steel pipe for drilling, and driving the reference steel pipe into the middle position of a pipe curtain to be formed by using a pushing machine;

the temporary support bars can prevent earth from entering the pipe curtain steel pipe and can also play a role in supporting the fixing groove, so that the strength of the pipe curtain steel pipe is enhanced, and the risk of bending the pipe curtain steel pipe during pipe jacking operation is reduced.

The selection of the positions of the fixing grooves on the two sides of the reference steel pipe and the selection of the positions of the fixing strips and the fixing grooves in the support steel pipe are made according to the radian of the pipe curtain and the position of the pipe curtain steel pipe in the pipe curtain, so that the pipe curtain steel pipes can form a required semi-enclosed shape after being spliced with each other; in the present embodiment, the cross section of the semi-enclosed shape is half of an ellipse whose section is the major axis of the ellipse. In other embodiments, it may be semi-circular, arcuate, etc.

in the driving process, the pushing part at the front end of the fixing strip can extrude the temporary supporting strip out of the fixing groove and enable the temporary supporting strip to fall into the pipe; the used temporary support bars can be recycled.

Every time the top is pushed away and is accomplished a pipe curtain steel pipe, just establish the staple bolt to the rear end hoop of a preceding pipe curtain steel pipe to improve intensity, beat when all pipe curtain steel pipes and establish the completion back, carry out the staple bolt to the pipe curtain steel pipe of edge and strengthen the back, take out the interim support bar in the pipe curtain steel pipe, form the pipe curtain of semi-enclosed structure behind the slip casting in the pipe curtain steel pipe.

Step three: dividing a tunnel to be excavated below a pipe curtain into a plurality of subareas, namely four ABCD subareas as shown in figure 6, excavating the subareas sequentially from top to bottom and from left to right, and performing primary support after the excavation of each subarea is finished;

firstly, excavating an area A, after the excavation of the area A is finished, erecting a grid steel frame on the inner wall of the tunnel, drilling a locking anchor pipe, spraying primary concrete, and erecting the upper section of a middle partition 230 on one side (namely the middle part of the tunnel) of the area A, which is far away from the inner wall of the tunnel; excavating the area B, and still performing primary support, and erecting the lower section of the middle partition wall 230 to complete the support of the middle partition wall 230; and then sequentially excavating a C area and a D area, and performing primary support operation after the excavation of each subarea is finished.

Step four: and after all the subareas are excavated and primary supports are carried out, removing redundant primary supports, namely removing the middle partition wall, laying a waterproof layer, applying a secondary lining and finishing the laying of the main support layer.

In the steps, the excavation of each subarea is carried out in sections, namely, supporting is carried out after excavating a certain depth, and the excavation operation of the next section of depth is carried out after all subareas reach the depth and are supported; and the middle partition wall is dismantled by adopting the step of sectional dismantling, and after each section of the middle partition wall is dismantled, a waterproof layer is laid, two linings are applied, and then the next section is dismantled.

By using the method to carry out supporting construction by the pipe curtain method, less steel pipes are used due to the adoption of a half-surrounding pipe curtain structure instead of a full-surrounding structure, so that the construction cost and the material cost are reduced; moreover, since an accurate space is not required to be reserved for driving the last steel pipe in the full-surrounding structure, the driving accuracy control requirement of the pipe curtain steel pipe is lower, the construction difficulty is greatly reduced, and the construction period is shortened;

in the pipe curtain driving process, the pipe jacking mode from the middle to the two sides is beneficial to greatly reducing the construction precision requirement, repeated measurement for the precision of each steel pipe is not needed, each pipe curtain steel pipe can be smoothly inserted, the construction efficiency is improved, and the construction difficulty is reduced;

the pipe curtain steel pipe only has convex fixed strip in one side, beats moreover and establishes the process and be the order in the fixed slot that the fixed strip inserted preceding pipe curtain steel pipe, passes the pipe curtain steel pipe at the drill bit and drills the in-process forward, inserts the in-process and can not touch the fixed strip of adjacent pipe curtain steel pipe to directly avoided the card to bore, broke and bore, the fixed strip emergence of the damage circumstances, further improved the efficiency of construction, improved the construction safety nature.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The pipe curtain steel pipe is characterized in that the pipe curtain steel pipe (110) comprises a supporting steel pipe, a fixing groove (131) is formed in one side of the supporting steel pipe (112), a fixing strip (120) matched with the fixing groove (131) is fixed in the corresponding position of the other side of the supporting steel pipe (112), and the fixing strip (120) and the fixing groove (131) are arranged along the axial direction of the supporting steel pipe; the supporting steel pipes are fixed by inserting the fixing strips (120) into the fixing grooves (131).

2. The tube curtain steel tube of claim 1, further comprising a reference steel tube (111), wherein reference grooves (132) are formed in both sides of the reference steel tube (111), and the fixing strip (120) can be inserted into the reference grooves (132) to fixedly connect the support steel tube (112) and the reference steel tube (111).

3. The tube curtain steel tube as claimed in claim 2, wherein the fixing groove (131) and the reference groove (132) are opened only at a rear end of the tube curtain steel tube (110); the cross section of the fixing strip (120) is of a T-shaped structure.

4. The tube curtain steel tube as claimed in claim 2, wherein the rear ends of the fixing strips (120) are provided with tightening grooves (122), the rear ends of the tube curtain steel tubes are fixed with hoops (140), and the tightening grooves (122) are matched with the hoops (140) in size.

5. The tube curtain steel tube as claimed in claim 4, wherein the front end of the fixing strip (120) is provided with a pushing part (121), and the pushing part (121) is obliquely arranged toward the outer wall of the support steel tube (112).

6. A supporting structure using the tube sheet steel pipe of claims 1 to 5, comprising a tube sheet (100) surrounding a tunnel and a concrete layer (200), wherein the tube sheet (100) is formed by arranging a plurality of tube sheet steel pipes (110), and is characterized in that the tube sheet (100) is a semi-surrounding structure and is disposed above the tunnel (300), and the concrete layer (200) is supported on the inner wall of the tunnel (300) and the bottom surface of the tube sheet (100); the pipe curtain (100) include the benchmark steel pipe (111) of intermediate position and be connected to a plurality of support steel pipes (112) of benchmark steel pipe (111) both sides, fill concrete in pipe curtain steel pipe (110) and fill, the outer end of pipe curtain steel pipe (110) all is fixed with staple bolt (140).

7. A pipe-curtain-method supporting construction method adopting the supporting structure of claim 6, which is characterized by comprising the following steps:

step three: dividing the tunnel position to be excavated into a plurality of subareas, excavating the subareas in sequence, and performing primary support after the excavation of each subarea is completed;

8. The tube curtain method support construction method as claimed in claim 6, wherein in the first and second steps, temporary support bars (133) are inserted into the fixing grooves and the reference grooves, so that the temporary support bars are in interference fit with the fixing grooves or the reference grooves; in the process of inserting the fixing strips, the temporary supporting strips (133) are extruded into the pipe curtain steel pipe by the pushing parts, and grouting is performed after the temporary supporting strips (133) are taken out.

9. The pipe-roofing construction method of claim 8, wherein in the second step, after the fixing bar is completely inserted into the fixing groove or the reference groove of the previous pipe-roofing steel pipe, the rear end of the previous pipe-roofing steel pipe is tightened by the hoop and then the next pipe-roofing steel pipe is erected.

10. The pipe-roof-method support construction method according to claim 7, wherein in the third step, the method for performing preliminary support after the divided excavation is completed is as follows: erecting a grid steel frame on the inner wall of the tunnel, drilling a foot locking anchor pipe, spraying primary concrete, and erecting a middle partition wall (230) on one side of each partition, which is far away from the inner wall of the tunnel; in step four, the removal of excess preliminary bracing is specifically the removal of the intermediate bulkhead (230).