A pipe-roof steel pipe, supporting structure and pipe-roof method supporting construction method

Abstract

The application discloses a pipe curtain steel pipe, which comprises support steel pipes, a fixing groove is formed in one side of the support steel pipe, a fixing strip matched with the fixing groove is fixed at a corresponding position of 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 support steel pipes are fixed by inserting the fixing strip into the fixing groove. The pipe curtain steel pipe is provided with the protruding fixing strip on one side only, the drill bit at the front end of the pipe curtain steel pipe does not touch the fixing strip of the adjacent pipe curtain steel pipe in the process of inserting the fixing strip into the fixing groove, the pipe curtain steel pipe is more reliable and smooth in driving and setting, the efficiency is higher, and the safety is higher.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and more particularly to a pipe-roof steel pipe, a supporting structure, and a pipe-roof supporting construction method. Background Art

[0002] The pipe curtain method is a commonly used advanced support method for large-section dark-excavated tunnels. The advantage of the pipe curtain method is that it can use miniaturized equipment to build large tunnels with complex cross-sections.

[0003] The main method is to drive steel pipes into the cross section in turn, and lock buckles are welded on both sides of the steel pipes along their axial direction. The steel pipes are connected by lock buckles. After the steel pipes are spliced ​​into a ring-shaped pipe curtain, concrete is poured into the steel pipes, and the middle of the pipe curtain is excavated. Concrete support is sprayed in the excavated tunnel in time until the tunnel construction is completed.

[0004] However, the construction of this pipe curtain method is relatively complicated. Since the steel pipe needs to be pushed through a drill rod during jacking, and jacking is required while drilling and jacking are performed to ensure the accuracy of the jacking angle of the steel pipe, the drill bit is likely to touch the lock buckle of the adjacent steel pipe during the jacking process, causing damage to the drill bit or jamming. Moreover, the arrangement of the last steel pipe in the annular pipe curtain is often extremely difficult. Due to the installation errors of the steel pipes on both sides, the position of the last steel pipe may be too small or too large, resulting in extremely strict requirements on construction accuracy, affecting the construction progress.

[0005] Therefore, a new type of pipe curtain support structure or construction method is needed to solve the above problems. Summary of the Invention

[0006] An object of the present invention is to provide a new technical solution for pipe-roof support construction.

[0007] According to a first aspect of the present invention, a pipe curtain steel pipe is provided, comprising a supporting steel pipe, wherein a fixing groove is provided on one side of the supporting steel pipe, and a fixing strip matching the fixing groove is fixed at a corresponding position on the other side of the supporting steel pipe, wherein the fixing strip and the fixing groove are both arranged along the axial direction of the supporting steel pipe; the supporting steel pipes are fixed to each other by inserting the fixing strip into the fixing groove.

[0008] With this solution, the pipe curtain steel pipe is provided with a raised fixing strip only on one side. During the process of inserting the fixing strip into the fixing groove, the drill bit at the front end of the pipe curtain steel pipe will not contact the fixing strip of the adjacent pipe curtain steel pipe, making the installation of the pipe curtain steel pipe more reliable and smooth, more efficient and safer.

[0009] Preferably, it further comprises a reference steel pipe, both sides of which are provided with reference grooves, and the fixing strips can be inserted into the reference grooves to fix the support steel pipe to the reference steel pipe.

[0010] Through this solution, the reference steel pipe is used as the middle reference, and supporting steel pipes are installed from the middle to both sides, which can reduce the error accumulation during the pipe curtain installation process, thereby facilitating the installation of the pipe curtain steel pipes and helping to improve construction efficiency.

[0011] Preferably, the fixing groove and the reference groove are only opened at the rear end of the pipe curtain steel pipe; the cross section of the fixing strip is a "T"-shaped structure.

[0012] Through this solution, the fixing strip can be inserted through the opening at the rear end of the fixing groove or the reference groove. The front end of the fixing groove and the reference groove is not open, which can maintain the strength of the front end of the pipe curtain steel pipe and avoid bending damage during the jacking process.

[0013] Preferably, a clamping groove is provided at the rear end of the fixing strip, and a clamp is fixed to the rear end of each of the pipe curtain steel pipes, and the size of the clamping groove matches that of the clamp.

[0014] Through this solution, the clamp can stably strengthen the rear end of the pipe curtain steel pipe, avoiding damage due to mutual tension or excessive internal pressure after connection and grouting; the tightening groove allows the clamp to pass through, avoiding direct tightening of the fixing strip, which causes excessive local pressure and damage to the clamp.

[0015] Preferably, a propulsion portion is provided at the front end of the fixing bar, and the propulsion portion is arranged obliquely toward the outer wall of the supporting steel pipe.

[0016] Through this solution, before the pipe curtain steel pipe is driven in, in order to prevent soil from entering the pipe, a temporary support bar will be inserted into the fixing groove. When the fixing bar is inserted into the fixing groove, the propulsion part can push the temporary support bar into the pipe curtain steel pipe, making it convenient to remove the temporary support bar for grouting.

[0017] According to a second aspect of the present invention, a support structure using the above-mentioned pipe curtain steel pipe is provided, comprising a pipe curtain surrounding a tunnel and a concrete layer, wherein the pipe curtain is composed of a plurality of pipe curtain steel pipes arranged in an arranged manner, the pipe curtain being a semi-enclosed structure and being arranged above the tunnel, and the concrete layer being supported on the inner wall of the tunnel and the bottom surface of the pipe curtain; the pipe curtain comprises a reference steel pipe in the middle position and a plurality of supporting steel pipes connected to both sides of the reference steel pipe, the pipe curtain steel pipe is filled with concrete, and the outer ends of the pipe curtain steel pipes are fixed with clamps.

[0018] Through this solution, the pipe curtain of the semi-enclosed structure is only supported to the top of the tunnel. Since the pipe curtain does not need to be arranged in a ring shape, the precision requirement is low. Under the premise of ensuring the support performance, the construction difficulty and construction time are greatly reduced. Moreover, the construction from the middle to the two sides does not need to consider the position accuracy and reserve of the last pipe, which is more efficient and safer.

[0019] According to a third aspect of the present invention, a pipe-roof support construction method using the above-mentioned pipe-roof support structure is provided, comprising the following steps:

[0020] Step 1: Insert the drill rod into the reference steel pipe, make the drill bit expose the front end of the reference steel pipe and start drilling. Use the jacking machine to drive the reference steel pipe into the middle position of the pipe curtain to be formed;

[0021] Step 2: Insert a drill rod into the support steel pipe, and drill with the drill bit exposed at the front end of the support steel pipe. Use a jacking machine to drive support steel pipes to both sides in sequence with the reference steel pipe as the center, so that the fixing strips are inserted into the fixing grooves or reference grooves of adjacent pipe curtain steel pipes. After the pipe curtain steel pipes are driven, grouting is injected into the pipe curtain steel pipes to form a semi-enclosed pipe curtain structure.

[0022] Step 3: Divide the tunnel location to be excavated into several zones, and excavate the zones in sequence, performing initial support after each zone is excavated;

[0023] Step 4: After all the zones are excavated and initial support is carried out, remove the excess initial support, lay the waterproof layer, and apply the secondary lining.

[0024] Preferably, in step one and step two, temporary support bars are inserted into both the fixing groove and the reference groove so that the temporary support bars have an interference fit with the fixing groove or the reference groove; during the insertion of the fixing bar, the propulsion part squeezes the temporary support bar into the pipe curtain steel pipe, and grouting is performed after the temporary support bar is taken out.

[0025] Preferably, in step 2, after the fixing strip is completely inserted into the fixing groove or reference groove of the previous pipe-roof steel pipe, the rear end of the previous pipe-roof steel pipe is clamped with a clamp before the next pipe-roof steel pipe is installed.

[0026] Preferably, in step three, the method for performing initial support after the partition excavation is completed is: erecting a grid steel frame on the inner wall of the tunnel and driving a locking anchor pipe, then spraying initial support concrete, and erecting a middle partition wall on the side of the partition away from the inner wall of the tunnel; in step four, removing excess initial support is specifically removing the middle partition wall.

[0027] According to one embodiment of the present disclosure, the use of the pipe-curtain support structure or support construction method can greatly improve construction efficiency, reduce construction difficulty, and greatly reduce construction costs while ensuring support strength.

[0028] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 Schematic diagram of the connection structure of the pipe curtain steel pipes in the first embodiment of the present invention.

[0031] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle pipe curtain steel pipe.

[0032] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure of the middle support along the axial direction.

[0033] Figure 4 yes Figure 2 Schematic diagram of the position of the clamps in the steel pipe of the middle pipe curtain.

[0034] Figure 5 yes Figure 1 Schematic diagram of the support structure using the pipe curtain steel pipe.

[0035] Figure 6 It is a schematic diagram of the position structure of the partitions in the pipe-roof support construction method of the second embodiment of the present invention. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0037] 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.

[0038] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0039] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0040] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] Example 1

[0042] like Figures 1 to 4As shown, the pipe curtain steel pipe 110 in this embodiment includes a support steel pipe 112, and a fixing groove 131 is opened on one side of the support steel pipe 112. A fixing bar 120 matching the fixing groove 131 is fixed at a corresponding position on the other side of the support steel pipe 112. The fixing bar 120 and the fixing groove 131 are both arranged along the axial direction of the support steel pipe 112; the support steel pipes 112 are fixed by inserting the fixing bar 120 into the fixing groove 131.

[0043] Through this solution of the present embodiment, the pipe-roof steel pipe 110 is provided with a raised fixing strip 120 only on one side. During the process of inserting the fixing strip 120 into the fixing groove 131, the drill bit at the front end of the pipe-roof steel pipe 110 will not contact the fixing strip 120 of the adjacent pipe-roof steel pipe 110, making the installation of the pipe-roof steel pipe 110 more reliable and smooth, more efficient, and safer.

[0044] In this or other embodiments, a reference steel pipe 111 is further included. Reference grooves 132 are defined on both sides of the reference steel pipe 111. The fixing bars 120 can be inserted into the reference grooves 132 to securely connect the support steel pipes 112 to the reference steel pipe 111. The reference steel pipe 111 serves as the central reference for the pipe curtain. Installing the support steel pipes 112 from the center outward toward both sides reduces the accumulation of errors during pipe curtain installation, facilitating installation of the pipe curtain steel pipes 110 and improving construction efficiency.

[0045] In this or other embodiments, the fixing groove 131 and the reference groove 132 are open only at the rear end of the pipe-roof steel pipe 110; the fixing bar 120 has a T-shaped cross-section. The fixing bar 120 can be inserted through the rear openings of the fixing groove 131 and the reference groove 132. The closed front ends of the fixing groove 131 and the reference groove 132 maintain the integrity of the front end of the pipe-roof steel pipe 110, thereby maintaining its strength and preventing bending damage during the pipe-roof jacking process.

[0046] The “T”-shaped fixing strip can remain locked after being inserted into the fixing groove 131 , thereby improving the strength and stability of the connection between the pipe curtain steel pipes 110 , and can also seal the fixing groove 131 and the reference groove 132 , facilitating the grouting operation.

[0047] In this or other embodiments, a clamping groove 122 is provided at the rear end of the fixing strip 120, and a clamp 140 is fixed to the rear end of each of the pipe-roof steel pipes 110. The dimensions of the clamping groove 122 match those of the clamp 140. The clamp 140 stabilizes and reinforces the rear end of the pipe-roof steel pipe 110, preventing deformation and damage due to mutual tension or excessive internal pressure after connection and grouting. The clamping groove 122 allows the clamp 140 to pass through, allowing the clamp to directly contact the pipe body of the pipe-roof steel pipe 110, preventing damage to the clamp 140 caused by excessive local pressure on the clamp 140 due to the protruding fixing strip 120.

[0048] In this embodiment or other embodiments, a propulsion portion 121 is provided at the front end of the fixing bar 120, and the propulsion portion 121 is arranged obliquely toward the outer wall of the support steel pipe 112. Before the pipe-roof steel pipe 110 is driven in, in order to prevent soil from entering the pipe and to improve the strength of the pipe-roof steel pipe 110 during the jacking operation, a temporary support bar 133 is inserted into the fixing groove 131. The propulsion portion 121 can push the temporary support bar 133 into the pipe-roof steel pipe 110 when the fixing bar 120 is inserted into the fixing groove 131. The fallen temporary support bar 133 is convenient for recovery and further grouting.

[0049] The temporary support bar 133 in this embodiment is made of steel or wood, and has an interference fit with the fixing groove 131 and is squeezed and fixed. Under the thrust of the propulsion part 121, it can be separated from the fixing groove 131 and fall into the pipe curtain steel pipe.

[0050] like Figure 5 As shown, the support structure in this embodiment includes a pipe curtain 100 surrounding the tunnel and a main support layer 200. The pipe curtain 100 is composed of a plurality of pipe curtain steel pipes 110 arranged in an array. The pipe curtain 100 is a semi-enclosed structure and is arranged above the tunnel 300. The main support layer 200 supports the inner wall of the tunnel 300 and the bottom surface of the pipe curtain 100. The pipe curtain steel pipe 110 includes a reference steel pipe 111 in the middle and support steel pipes 112 on both sides of the reference steel pipe 111. A reference groove 132 is provided on both sides of 111, a fixing groove 131 is provided on one side of the support steel pipe 112, and a fixing bar 120 matching the fixing groove 131 is fixed at a corresponding position on the other side of the support steel pipe 112. The reference groove 132 and the fixing groove 131 are the same size, and the fixing bar 120 and the fixing groove 131 are both arranged along the axial direction of the pipe curtain steel pipe 110; the pipe curtain steel pipes 110 are fixed by inserting the fixing bar 120 into the fixing groove 131 or the reference groove 132.

[0051] With this solution of this embodiment, the semi-enclosed pipe roof 100 is supported only to the top of the tunnel 300. Since the pipe roof 100 does not need to be arranged in a ring shape, the precision requirement is low, and there is no need to reserve precise space for the insertion of the last steel pipe. In addition, after the central reference steel pipe 111 is installed, the supporting steel pipes 112 are extended to both sides, further facilitating construction. There is no need to consider the position accuracy of each pipe. Under the premise of ensuring support performance, the construction difficulty and construction time are greatly reduced.

[0052] The pipe-roof steel pipe 110 is provided with a raised fixing strip 120 only on one side. During the process of inserting the fixing strip 120 into the fixing groove 131, the drill bit at the front end of the pipe-roof steel pipe 110 will not contact the fixing strip 120 of the adjacent pipe-roof steel pipe 110, making the installation of the pipe-roof steel pipe 110 more reliable and smooth, without the possibility of the drill getting stuck, the drill breaking, or the fixing strip 120 being damaged, thereby improving construction efficiency and safety.

[0053] In this embodiment, the main support layer 200 protects the initial support 210 and the waterproof layer 220, wherein the initial support 210 is mainly a grid steel frame and is formed by spraying initial support concrete after locking anchor pipes are installed.

[0054] According to this embodiment, the use of the pipe-roof support structure or support construction method can greatly improve construction efficiency, reduce construction difficulty, and greatly reduce construction costs while ensuring support strength.

[0055] Example 2

[0056] The pipe curtain support construction method using the pipe curtain support structure in this embodiment includes the following steps:

[0057] Step 1: Select several steel pipes, weld a T-shaped fixing bar on one side, and open a fixing groove at the corresponding position on the other side. Make the width of the fixing groove sufficient to allow the fixing bar to be inserted and locked, thus completing the preparation of the supporting steel pipes.

[0058] A steel pipe of the same specification is selected, and reference grooves are opened at corresponding positions on both sides to complete the preparation of the reference steel pipe. Temporary support strips are filled in the reference groove and the fixed groove respectively. The temporary support strips are interference fit with the reference groove and the fixed groove, and are temporarily fixed by friction so that the side of the temporary support strip is flush with the outer wall of the pipe curtain steel pipe to reduce the resistance between the pipe and the soil during the jacking operation.

[0059] Insert the drill rod into the reference steel pipe, make the drill bit expose the front end of the reference steel pipe for drilling, and use the jacking machine to drive the reference steel pipe into the middle position of the pipe curtain to be formed;

[0060] The temporary support strips can not only prevent soil from entering the pipe curtain steel pipes, but also support the fixing grooves, thereby strengthening the strength of the pipe curtain steel pipes and reducing the risk of bending of the pipe curtain steel pipes during pipe jacking operations.

[0061] The positions of the fixing grooves on both sides of the reference steel tube, as well as the fixing strips and fixing grooves in the supporting steel tubes, are determined based on the curvature of the tube curtain and the position of the tube curtain steel tubes within the tube curtain, so that the tube curtain steel tubes, after being spliced ​​together, form the desired semi-enclosed shape. In this embodiment, the cross-section of the semi-enclosed shape is half of an ellipse with the major axis of the ellipse as the cross-section. In other embodiments, semicircular, arc-shaped, and other shapes may be employed.

[0062] Step 2: Insert a drill rod into the support steel pipe, and drill with the drill bit exposed at the front end of the support steel pipe. Use a jacking machine to drive support steel pipes to both sides in sequence with the reference steel pipe as the center, so that the fixing strips are inserted into the fixing grooves or reference grooves of adjacent pipe curtain steel pipes. After the pipe curtain steel pipes are driven, grouting is injected into the pipe curtain steel pipes to form a semi-enclosed pipe curtain structure.

[0063] During the driving process, the propulsion portion at the front end of the fixing strip can squeeze the temporary support strip out of the fixing groove and make the temporary support strip fall into the tube; the used temporary support strip can be recycled and reused.

[0064] Each time a pipe curtain steel pipe is pushed, a clamp is installed on the rear end of the previous pipe curtain steel pipe to increase the strength. When all the pipe curtain steel pipes are installed, the pipe curtain steel pipes at the edge are reinforced with clamps, the temporary support strips in the pipe curtain steel pipes are taken out, and grouting is injected into the pipe curtain steel pipes to form a semi-enclosed structure pipe curtain.

[0065] Step 3: Divide the tunnel location to be excavated under the pipe curtain into several zones, such as Figure 6 As shown, it is divided into four zones, ABCD, and the zones are excavated in sequence from top to bottom and from left to right. After each zone is excavated, initial support is carried out.

[0066] That is, first excavate area A. After the excavation of area A is completed, a grid steel frame is erected on the inner wall of the tunnel, and locking anchor pipes are installed, and then initial support concrete is sprayed. The upper section of the middle partition wall 230 is erected on the side of area A away from the inner wall of the tunnel (i.e. the middle of the tunnel); then excavate area B, and still carry out initial support, erect the lower section of the middle partition wall 230, and complete the support of the middle partition wall 230; then excavate areas C and D in turn, and carry out initial support operations after the excavation of each subarea is completed.

[0067] Step 4: After all the partitions are excavated and initially supported, remove the excess initial support, that is, remove the middle partition wall, lay the waterproof layer, apply the second lining, and complete the laying of the main support layer.

[0068] In the above steps, the excavation of each partition is carried out in sections, that is, support is carried out after excavation to a certain depth. When all partitions reach the depth and are supported, the excavation of the next depth is carried out; the demolition of the middle partition wall also adopts the step of segmented demolition. After the demolition of each section of the middle partition wall, the waterproof layer is laid and the second lining is applied before the demolition of the next section is carried out.

[0069] This method is used for pipe curtain support construction. Since a semi-enclosed pipe curtain structure is adopted instead of a fully enclosed structure, fewer steel pipes are used, thus reducing construction and material costs. Moreover, since there is no need to reserve precise space for driving the last steel pipe in the fully enclosed structure, the driving precision control requirements for the pipe curtain steel pipe are lowered. This not only greatly reduces the construction difficulty but also shortens the construction period.

[0070] During the pipe curtain installation process, the pipe jacking method from the center to the sides helps to greatly reduce the construction accuracy requirements. There is no need to repeatedly measure the accuracy of each steel pipe, ensuring that each pipe curtain steel pipe can be inserted smoothly, which helps to improve construction efficiency and reduce construction difficulty.

[0071] The pipe-roof steel pipe has a protruding fixing strip only on one side, and the installation process is in the order of inserting the fixing strip into the fixing groove of the previous pipe-roof steel pipe. When the drill bit passes through the pipe-roof steel pipe and drills forward, it will not touch the fixing strip of the adjacent pipe-roof steel pipe during the insertion process, thereby directly avoiding the occurrence of drill sticking, drill breakage, and fixing strip damage, further improving construction efficiency and safety.

[0072] 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 illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A pipe roof steel pipe, characterized in that: The pipe curtain steel pipe (110) includes a supporting steel pipe, a fixing groove (131) is provided on one side of the supporting steel pipe (112), and a fixing strip (120) matching the fixing groove (131) is fixed at a corresponding position on the other side of the supporting steel pipe (112), and the fixing strip (120) and the fixing groove (131) are both arranged along the axial direction of the supporting steel pipe; the supporting steel pipes are fixed by inserting the fixing strip (120) into the fixing groove (131); a propulsion portion (121) is provided at the front end of the fixing strip (120), and the propulsion portion (121) is arranged obliquely toward the outer wall of the supporting steel pipe (112); a temporary support strip (133) is provided in the fixing groove (131), and the temporary support strip is interference-fitted with the fixing groove (131); The invention also includes a reference steel pipe (111), both sides of which are provided with reference grooves (132), and the fixing bar (120) can be inserted into the reference grooves (132) to fix the support steel pipe (112) and the reference steel pipe (111); the pushing portion (121) can push the temporary support bar (133) into the pipe curtain steel pipe (110) when the fixing bar (120) is inserted into the fixing groove (131), so that the fallen temporary support bar (133) can be easily recovered and processed, and then grouting treatment is performed; the fixing groove (131) and the reference groove (132) are only open at the rear end of the pipe curtain steel pipe (110); the cross section of the fixing bar (120) is a "T"-shaped structure; the width of the fixing groove (131) can allow the fixing bar (120) to be inserted and locked.

2. The pipe-roof steel pipe according to claim 1, characterized in that: The rear end of the fixing strip (120) is provided with a clamping groove (122), and the rear end of the pipe curtain steel pipe is fixed with a clamping hoop (140), and the size of the clamping groove (122) matches the size of the clamping hoop (140).

3. A support structure using the pipe curtain steel pipe according to claim 1 or 2, comprising a pipe curtain (100) surrounding a tunnel and a concrete layer (200), wherein the pipe curtain (100) is composed of a plurality of pipe curtain steel pipes (110) arranged in an array, and characterized in that: The pipe curtain (100) is a semi-enclosed structure and is arranged above the tunnel (300). The concrete layer (200) is supported on the inner wall of the tunnel (300) and the bottom surface of the pipe curtain (100). The pipe curtain (100) includes a reference steel pipe (111) in the middle and a plurality of support steel pipes (112) connected to both sides of the reference steel pipe (111). Concrete is poured into the pipe curtain steel pipe (110). The outer ends of the pipe curtain steel pipes (110) are fixed with clamps (140). The front end of the fixing bar (120) is provided with a propulsion part (121). The propulsion part (121) is directed toward the support steel pipe (111). 12) is arranged obliquely; a temporary support bar (133) is provided in the fixing groove (131), and the temporary support bar and the fixing groove (131) are interference-fitted; the pushing portion 121 can push the temporary support bar 133 into the pipe curtain steel pipe 110 when the fixing bar 120 is inserted into the fixing groove 131, so that the fallen temporary support bar 133 can be easily recovered and then grouting is performed; the fixing groove (131) and the reference groove (132) are only open at the rear end of the pipe curtain steel pipe (110); the cross section of the fixing bar (120) is a "T"-shaped structure; the width of the fixing groove (131) can allow the fixing bar (120) to be inserted and locked.

4. A pipe-roof support construction method using the support structure according to claim 3, characterized in that: The steps include: Step 1: Insert the drill rod into the reference steel pipe, make the drill bit expose the front end of the reference steel pipe and start drilling. Use the jacking machine to drive the reference steel pipe into the middle position of the pipe curtain to be formed; Step 2: Insert a drill rod into the support steel pipe, and drill with the drill bit exposed at the front end of the support steel pipe. Use a jacking machine to drive support steel pipes to both sides in sequence with the reference steel pipe as the center, so that the fixing strips are inserted into the fixing grooves or reference grooves of adjacent pipe curtain steel pipes. After the pipe curtain steel pipes are driven, grouting is injected into the pipe curtain steel pipes to form a semi-enclosed pipe curtain structure. Step 3: Divide the tunnel location to be excavated into several zones, and excavate the zones in sequence, performing initial support after each zone is excavated; Step 4: After all the zones are excavated and initial support is carried out, remove the excess initial support, lay the waterproof layer, and apply the secondary lining.

5. The pipe-roof support construction method according to claim 4, characterized in that: In step 1 and step 2, a temporary support bar (133) is inserted into both the fixing groove and the reference groove, so that the temporary support bar is interference-fitted with the fixing groove or the reference groove; during the insertion of the fixing bar, the pushing part squeezes the temporary support bar (133) into the pipe curtain steel pipe, and grouting is performed after the temporary support bar (133) is taken out.

6. The pipe-roof support construction method according to claim 5, characterized in that: In step 2, after the fixing strip is completely inserted into the fixing groove or reference groove of the previous pipe curtain steel pipe, the rear end of the previous pipe curtain steel pipe is tightened with a clamp before the next pipe curtain steel pipe is installed.

7. The pipe-roof support construction method according to claim 6, characterized in that: In step 3, the method for performing initial support after the completion of the partition excavation is as follows: a grid steel frame is erected on the inner wall of the tunnel and a locking anchor pipe is installed, and then initial support concrete is sprayed, and a middle partition wall (230) is erected on the side of the partition away from the inner wall of the tunnel; in step 4, the removal of excess initial support is specifically the removal of the middle partition wall (230).

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