Secondary lining reinforcement cage and binding method

Abstract

The invention discloses a secondary lining reinforcement cage which comprises an inner-layer reinforcement mesh, an outer-layer reinforcement mesh, a plurality of hooked bars for providing reverse tension for the inner-layer reinforcement mesh and the outer-layer reinforcement mesh and a plurality of supporting bars for providing reverse thrust for the outer-layer reinforcement mesh and the inner-layer reinforcement mesh. Meanwhile, the invention discloses a secondary lining reinforcement cage synchronous binding method which is matched with tunnel reinforcement cage operation equipment and is used for synchronously binding the inner-layer reinforcement mesh and the outer-layer reinforcement mesh, and a secondary lining reinforcement cage step-by-step binding method which is matched with the tunnel reinforcement cage operation equipment and is used for sequentially binding the outer-layer reinforcement mesh and the inner-layer reinforcement mesh. According to the secondary lining steel reinforcement cage, existing annular positioning ribs and existing horizontal positioning ribs are omitted, a large amount of steel is saved, meanwhile, the standard requirement can be met, the secondary lining steel reinforcement cage can be matched with the operation mode of tunnel steel reinforcement cage operation equipment, and therefore the construction efficiency can be greatly improved, and construction manpower can be saved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of steel bar engineering, and in particular to a secondary lining steel bar cage and a binding method. Background Art

[0002] Secondary lining (abbreviated as "second lining") is a term commonly used in tunnel construction. It refers to the reinforced concrete lining constructed on the inner side of the primary support. Its purpose is to form a composite lining with the primary support to achieve the effect of reinforcing support, thereby meeting the requirements of modern tunnel construction.

[0003] The secondary lining includes steel bar construction, that is, forming an arched steel cage 08 that fits the shape of the tunnel inner wall through tying. Figures 1 to 5 The present invention shows a plurality of existing annular positioning ribs 01 (closed to the tunnel wall) arranged at intervals along the length direction of the tunnel 09, a plurality of groups of existing "7"-shaped ribs 02 (each group includes a plurality of existing "7"-shaped ribs 02 spaced apart along the circumference of the tunnel; the existing "7"-shaped ribs 02 are formed by bending straight ribs, one section of which is close to the tunnel wall, and the other section of which extends radially inwardly along the tunnel and is fixed to the existing annular positioning ribs 01), a plurality of existing external horizontal positioning ribs 03 (fixed to the "7"-shaped ribs 02) arranged at intervals along the circumference of the tunnel, and a plurality of existing internal horizontal positioning ribs 04 (fixed to the existing "7"-shaped ribs 02) arranged at intervals along the circumference of the tunnel. The existing outer steel mesh 05 (formed by the existing outer annular ribs and the existing outer distribution ribs in a tic-tac-toe pattern, wherein the existing outer annular ribs are against the inner side of the existing outer horizontal positioning ribs 03, and the existing outer distribution ribs are against the inner side of the existing outer annular ribs), the existing inner steel mesh 06 (formed by the existing inner annular ribs and the existing inner distribution ribs in a tic-tac-toe pattern, wherein the existing inner annular ribs are against the inner side of the existing inner horizontal positioning ribs 04, and the existing inner distribution ribs are against the inner side of the existing inner annular ribs), and a number of existing hook bars 07 (one end of which is hooked to the node of the existing outer steel mesh 05, and the other end is hooked to the node of the existing inner steel mesh 06), which always rely on the existing annular positioning ribs 01 to provide support for the steel cage.

[0004] In the prior art, all the steel bars that make up the steel cage are arranged manually, and the workers are located inside the steel cage. During construction, they can only tie the existing outer steel mesh 05 first and then tie the existing inner steel mesh 06. Therefore, it is impossible to support the steel cage from the inside, and the existing annular positioning bars 01 can only be used to provide support for the steel cage. In order for the existing annular positioning bars 01 to achieve the function of stable support, they must fit tightly with the inner wall of the tunnel to achieve fixation. In addition, since the existing outer steel mesh 05 is already connected to the existing annular positioning bars 01, and the existing inner steel mesh 06 is located below the existing outer steel mesh 05 and has a tendency to fall and deform, it is necessary to transfer the force of the existing outer steel mesh 05 to the existing inner steel mesh 06 by setting the existing hook bars 07. This support is from outside to inside, and accordingly, its binding sequence must also be from outside to inside to comply with the law of force transfer, as follows: Step 1, place the existing annular positioning bar 01 against and fix it on the tunnel wall to provide support for other steel bars; Step 2, place one section of the existing "7"-shaped bar 02 against the tunnel wall, and extend the other section radially inward along the tunnel and form a connection with the existing annular positioning bar 01; Step 3, fix the existing outer horizontal positioning bar 03 on the existing "7"-shaped bar 02 at the specified spacing (the spacing between the existing outer horizontal positioning bar 03 and the tunnel wall); Step 4, fix the existing outer layer steel mesh 05 on the existing outer horizontal positioning bar The fifth step is to fix the existing inner horizontal positioning rib 04 on the existing "7" rib 02 at the specified spacing (the spacing between the existing inner horizontal positioning rib 04 and the existing outer horizontal positioning rib 03); the sixth step is to fix the existing inner layer steel mesh 06 on the existing inner horizontal positioning rib 04 (first fix the existing inner ring rib on the existing inner horizontal positioning rib 04, and then fix the existing inner distribution rib on the existing inner ring rib); the seventh step is to fix the existing hook rib 07 on the existing outer layer steel mesh 05 and the existing inner layer steel mesh 06.

[0005] Although the existing steel cage can remain stable under the support of the existing annular positioning ribs 01, the existing annular positioning ribs 01 must be closely attached to the inner wall of the tunnel in order to achieve the function of stable support, so as to resist the overturning of the steel cage through the friction generated by extrusion. This setting method of attaching to the inner wall of the tunnel does not meet the requirements of the thickness of the steel protection layer in the relevant design and construction specifications, that is, there is not enough gap reserved between the existing annular positioning ribs 01 and the inner wall of the tunnel to form a concrete protection layer.

[0006] At the same time, with the advancement of steel bar construction technology, tunnel steel cage operation equipment that can automatically arrange steel bars has emerged (such as the technical solution disclosed in the Chinese patent application document with application publication number: CN1151631390, invention name "Tunnel steel cage operation equipment and tunnel steel cage construction method"). In the process of using this equipment for steel bar construction, support is provided for the steel bars from the inside (the force transmission direction is changed from outside to inside in the prior art to inside to outside), and after the steel cage is tied, the inner and outer layers of steel mesh will form mutual support, so the overall force form of the steel cage will change essentially. Due to the change in the force form of the steel cage, the structural form of the steel cage in the prior art no longer meets the construction requirements of the tunnel steel cage operation equipment. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a secondary lining steel cage and binding method that can utilize the inner and outer layers of steel mesh to support each other to achieve a relatively stable state, thereby eliminating the existing annular positioning reinforcement 01 that does not meet the requirements of relevant design and construction specifications, and can be compatible with tunnel steel cage operating equipment.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions: A double-lining steel cage comprises an inner steel mesh and an outer steel mesh which can be constructed by tunnel steel cage operation equipment, wherein the inner steel mesh and the outer steel mesh are arranged at intervals, and a plurality of hook bars connected to the inner steel mesh and the outer steel mesh are provided for pulling the inner steel mesh and the outer steel mesh inwardly roughly along the radial direction of the tunnel, and a plurality of support bars are sandwiched between the inner steel mesh and the outer steel mesh for abutting the inner steel mesh and providing outward thrust to the inner steel mesh and the outer steel mesh roughly along the radial direction of the tunnel.

[0009] As a further improvement of the above technical solution: The inner layer steel mesh includes a plurality of inner annular ribs and a plurality of inner distribution ribs located on the outside thereof and cross-connected, and the outer layer steel mesh includes a plurality of outer annular ribs and a plurality of outer distribution ribs located on the inside thereof and cross-connected; the two ends of the supporting ribs respectively abut against the inner distribution ribs and the outer distribution ribs.

[0010] The steel cage also includes a plurality of limiting ribs arranged along the radial direction of the tunnel. The limiting ribs are respectively fixed to the inner steel mesh and the outer steel mesh, and one end of the limiting ribs is connected to the tunnel wall.

[0011] The tail sections of the limiting ribs are bent and fit against the tunnel wall, and the tail sections are arranged in disorder in various directions.

[0012] The supporting reinforcement is configured as a "J"-shaped horse stool reinforcement, which includes a middle transverse reinforcement, and the two ends of the middle transverse reinforcement are respectively bent vertically toward the same side to form two sections of vertical reinforcement, and one end of the two sections of vertical reinforcement is bent vertically in the opposite direction away from the middle transverse reinforcement to form two sections of tail transverse reinforcement, and the tail transverse reinforcement is perpendicular to the middle transverse reinforcement; the middle transverse reinforcement is against at least one inner annular reinforcement, and each of the tail transverse reinforcement is against at least one outer annular reinforcement.

[0013] The secondary lining steel cage does not include annular positioning bars.

[0014] The secondary lining steel cage does not include horizontal positioning bars.

[0015] In addition, a synchronous binding method of the secondary lining steel cage is also adopted, comprising the following steps: Step A1, using tunnel reinforcement cage operation equipment to synchronously lay out inner annular reinforcement and outer annular reinforcement; Step A2, tying the inner distribution reinforcement and the outer distribution reinforcement to form the inner and outer steel meshes, and simultaneously fixing the supporting reinforcement between the inner and outer steel meshes; Step A3, tying hook reinforcement and / or limiting reinforcement; Wherein, the step A2 comprises: Step A21, positioning the inner and outer annular ribs from left to right along the tunnel annular direction; Step A22, following the progress of step A21, ties the inner and outer distribution bars to complete the positioning of the inner and outer annular bars, and fixes the supporting bars in the sandwich of the inner and outer steel meshes.

[0016] As a further improvement of the above technical solution: The step A21 comprises: Step A211, the inner and outer guide wheels of the tunnel reinforcement cage operation equipment are positioned on the left side of the tunnel, the inner annular reinforcement is laid on the inner guide wheel, and the outer annular reinforcement is laid on the outer guide wheel; Step A212, the left ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the left side; Step A213, the inner and outer guide wheels move synchronously from left to right along the tunnel annular direction, and push the inner and outer annular ribs from left to right to the preset positions respectively; Step A214, the right ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the right side; The step A22 comprises: Step A221, following the rear side of the inner and outer guide wheels in the moving direction, tying the inner and outer distribution bars to form the inner and outer steel meshes; Step A222, following the rear side of the inner and outer distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer of the inner and outer steel meshes.

[0017] Alternatively, a step-by-step tying method of the secondary lining steel cage is also adopted, comprising the following steps: Step B1, using tunnel reinforcement cage operation equipment to lay out the outer annular reinforcement; Step B2, tying the outer distribution reinforcement to form an outer steel mesh; Step B3, using tunnel reinforcement cage operation equipment to lay out inner annular reinforcement; Step B4, tying the inner distribution reinforcement to form an inner layer of steel mesh, and simultaneously fixing the support reinforcement between the inner and outer layers of steel mesh; Step B5, tie hook reinforcement and / or limit reinforcement.

[0018] As a further improvement of the above technical solution: The step B2 is: using the tunnel reinforcement cage operation equipment to position the outer annular reinforcement from left to right along the tunnel circumference, and following the progress of the positioning, tying the outer distribution reinforcement to complete the positioning of the outer annular reinforcement; The step B2 comprises: Step B21, the outer guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the outer annular reinforcement is laid on the outer guide wheel; Step B22, the left end of the outer annular reinforcement is connected to the invert reinforcement located on the left side; Step B23, the outer guide wheel moves from left to right along the tunnel annular direction, pushing the outer annular rib from left to right to a preset position; Step B24, the right end of the outer annular reinforcement is connected to the invert reinforcement located on the right side; Step B25, following the rear side of the moving direction of the outer guide wheel, tying the outer distribution reinforcement to form an outer layer of steel mesh.

[0019] The step B3 is: positioning the inner annular reinforcement from left to right along the tunnel circumference; and following the progress of positioning, tying the inner distribution reinforcement to complete the positioning of the inner annular reinforcement; and simultaneously following the progress of tying, fixing the support reinforcement in the sandwich of the inner and outer steel meshes; The step B3 comprises: Step B21, the inner guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the inner annular reinforcement is laid on the inner guide wheel; Step B22, the left end of the inner annular reinforcement is connected to the invert reinforcement located on the left side; Step B23, the inner guide wheel moves from left to right along the tunnel annular direction, pushing the inner annular rib from left to right to a preset position; Step B24, the right end of the inner annular reinforcement is connected to the invert reinforcement located on the right side; Step B25, following the rear side of the moving direction of the inner guide wheel, tying the inner distribution reinforcement to form an inner layer of steel mesh; Step B26, following the rear side of the inner distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer between the inner and outer steel meshes.

[0020] Compared with the prior art, the advantages of the present invention are: Since the existing annular positioning bars and the existing horizontal positioning bars have been cancelled, a large amount of steel can be saved while meeting the requirements of the specifications and being adaptable to the operating methods of the tunnel reinforcement cage operating equipment, thereby greatly improving construction efficiency and saving construction manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the positional relationship between the steel cage and the tunnel in the prior art; Figure 2 It is a partial schematic diagram of a steel cage in the prior art. Figure 1 ; Figure 3 It is a partial schematic diagram of a steel cage in the prior art. Figure 2 ; Figure 4 It is a partial schematic diagram of a steel cage in the prior art. Figure 3 ; Figure 5 It is a partial schematic diagram of a steel cage in the prior art. Figure 4 ; Figure 6 is a schematic diagram of the positional relationship between the steel cage and the tunnel in Example 1; Figure 7 It is a partial schematic diagram of the steel cage in Example 1 Figure 1 ; Figure 8 It is a partial schematic diagram of the steel cage in Example 1 Figure 2 ; Fig. 9 It is a partial schematic diagram of the steel cage in Example 1 Figure 3 ; Fig.10 It is a partial schematic diagram of the steel cage in Example 1 Figure 4 .

[0022] 01. Existing circumferential positioning reinforcement 01 (red in the attached picture); 02. Existing "7"-shaped reinforcement (yellow in the attached picture); 03. Existing external horizontal positioning reinforcement (green in the attached picture); 04. Existing internal horizontal positioning reinforcement (green in the attached picture); 05. Existing external steel mesh (white in the attached picture); 06. Existing internal steel mesh (white in the attached picture); 07. Existing hook reinforcement (pink in the attached picture); 08. Steel cage; 09. Tunnel; 1. Inner steel mesh (white in the attached figure); 11. Inner annular ribs (white in the attached figure); 12. Inner distribution ribs (white in the attached figure); 2. Outer steel mesh (white in the attached figure); 21. Outer annular ribs (white in the attached figure); 22. Outer distribution ribs (white in the attached figure); 3. Hook ribs (pink in the attached figure); 4. Support ribs (green in the attached figure); 5. Limiting ribs (yellow in the attached figure). DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 like Figures 6 to 10 As shown, the second lining steel cage of this embodiment includes an inner steel mesh 1 and an outer steel mesh 2 which can be constructed by tunnel steel cage operation equipment, and the inner steel mesh 1 and the outer steel mesh 2 are arranged at intervals, characterized in that: the inner steel mesh 1 and the outer steel mesh 2 are provided with a plurality of hook bars 3 connected with the two and tightening the two inwardly roughly along the radial direction of the tunnel, and a plurality of support bars 4 abutting the two and providing outward thrust for the two roughly along the radial direction of the tunnel are also sandwiched between the inner steel mesh 1 and the outer steel mesh 2. The two ends of the inner and outer steel meshes are respectively connected to the inverted arch steel bars pre-buried in the tunnel. By simultaneously setting hook bars 3 and support bars 4 on the inner and outer steel meshes, the hook bars 3 provide reverse tension for the inner and outer steel meshes, and the support bars 4 provide reverse thrust for the inner and outer steel bars, and the direction of the tension provided by the hook bars 3 is opposite to the direction of the thrust provided by the support bars 4, so that the inner steel mesh 1 and the outer steel mesh 2 are relatively fixed along the radial direction of the tunnel. At this time, the inner steel mesh 1 and the outer steel mesh 2 are connected as a whole to form a structure with thickness. During the steel bar binding process, the tunnel steel cage operation equipment is set on the inner side of the inner steel mesh 1 and provides it with support force outward along the radial direction of the tunnel. By setting the support bars 4, the support force received by the inner steel mesh 1 can be transmitted to the outer steel mesh 2 by the support bars 4, so as to achieve the purpose of supporting the entire steel cage with the tunnel steel cage operation equipment. The support bars 4 can not only realize the function of force transmission, but also effectively control the layer distance between the inner and outer steel meshes because they are clamped between the two layers of steel meshes.

[0025] In the prior art, the inner and outer steel meshes are connected only by the existing hook bar 07 (equivalent to the hook bar 3 in this application), and the existing hook bar 07 only has a pulling effect on the two, and the tension of the existing hook bar 07 on the existing inner steel mesh 06 (equivalent to the inner steel mesh 1 in this application) is radially outward along the tunnel, and the tension on the existing outer steel mesh 05 (equivalent to the outer steel mesh 2 in this application) is radially inward along the tunnel, which cannot prevent the inner and outer steel meshes from being close to each other. Therefore, if the tunnel steel cage operation equipment is used to support the existing inner steel mesh 06, the supporting force cannot be transmitted to the existing outer steel mesh 05, so it is impossible to prevent the existing outer steel mesh 05 from collapsing toward the existing inner steel mesh 06. In addition, in order to achieve fixation, the steel cage in the prior art needs to be additionally provided with the existing annular positioning bar 01 and the existing outer horizontal positioning bar 03, and the existing annular positioning bar 01 is also in contact with the inner wall of the tunnel, so that it cannot meet the relevant design and construction specifications. In the technical solution disclosed in the present application, since the existing annular positioning ribs 01 and the existing horizontal positioning ribs 03 are eliminated, a large amount of steel can be saved while meeting the regulatory requirements, and can be adapted to the operating mode of the tunnel reinforcement cage operating equipment, thereby greatly improving the construction efficiency and saving construction manpower.

[0026] In this embodiment, the inner steel mesh 1 includes a plurality of inner annular ribs 11 and a plurality of inner distribution ribs 12 located on the outer side thereof and cross-connected, and the outer steel mesh 2 includes a plurality of outer annular ribs 21 and a plurality of outer distribution ribs 22 located on the inner side thereof and cross-connected; the two ends of the support rib 4 abut against the inner distribution ribs 12 and the outer distribution ribs 22 respectively. The two ends of the inner annular ribs 11 and the outer annular ribs 21 are respectively connected to the inverted arch steel bars embedded in the tunnel. The support rib 4 is sandwiched between the inner steel mesh 1 and the outer steel mesh 2, and the thrust provided by the support rib 4 to the inner steel mesh 1 is directed inward along the tunnel radial direction, and the thrust provided to the outer steel mesh 2 is directed outward along the tunnel radial direction. By arranging the inner distribution ribs 12 on the outer side of the inner annular ribs 11, and the outer distribution ribs 22 on the inner side of the outer annular ribs 21, and abutting the two ends of the support rib 4 on the distribution ribs, the distribution ribs can be used to transmit thrust to the several annular ribs intersecting therewith, thereby avoiding that the thrust of the support rib 4 is completely concentrated on a certain annular rib, and thus the overall force of the structure can be optimized. Specifically, the support rib 4 is arranged in a "J" shape, which is commonly used in steel bar construction, has a simple structure, and is easy to manufacture or purchase. Of course, in other embodiments, it can also be replaced with other shapes according to actual requirements, which is not limited here.

[0027] In this embodiment, the steel cage also includes a plurality of limiting ribs 5 arranged along the radial direction of the tunnel. The limiting ribs 5 are respectively fixed to the inner steel mesh 1 and the outer steel mesh 2, and one end thereof is connected to the tunnel wall. The limiting ribs 5 are dispersedly arranged, and they provide radial support for the steel cage in all directions. Not only that, the limiting ribs 5 can also resist the overturning of the steel cage by friction with the tunnel wall. Furthermore, the tail section of the limiting rib 5 is bent and fits with the tunnel wall, and each tail section is arranged disorderly in all directions. By bending the tail section of the limiting rib 5 and making the tail section fit with the tunnel wall, the contact area between the limiting rib 5 and the tunnel wall can be effectively increased, thereby increasing the friction force. Because the deformation of the steel cage may occur in any direction, the tail sections of each limiting rib 5 are not arranged in the same direction to generate a more balanced friction force in all directions.

[0028] In this embodiment, the support rib 4 is configured as a "J"-shaped horse stool rib, which includes a middle transverse rib, and the two ends of the middle transverse rib are respectively bent vertically toward the same side to form two sections of vertical ribs, and one end of the two vertical ribs is bent vertically in the opposite direction away from the middle transverse rib to form two sections of tail transverse ribs, and the tail transverse ribs are perpendicular to the middle transverse rib; the middle transverse rib is against an inner annular rib 11, and each tail transverse rib is against an outer annular rib 21. The "J"-shaped horse stool rib is formed by bending a steel bar, and the manufacturing process is simple and the price is low. By configuring the support rib 4 as a "J"-shaped horse stool rib, an inner annular rib 11 is connected to two outer annular ribs 21, which is more stable in structure and conducive to force transmission.

[0029] In this embodiment, the secondary lining steel cage does not include annular positioning bars. In the prior art, the steel bars that make up the steel cage are all arranged manually, and the workers are located on the inside of the steel cage. During construction, they can only tie the outer steel mesh first and then the inner steel mesh. Therefore, it is impossible to support the steel cage from the inside, and the steel cage can only be supported by the annular positioning bars. In order for the annular positioning bars to achieve the function of stable support, they must fit tightly with the inner wall of the tunnel to achieve fixation. This method of laying out steel bars that fits the inside of the tunnel does not meet the requirements of relevant design and construction specifications because it cannot leave enough thickness for the protective layer. The present application provides support for the steel mesh from the inside to the outside through the tunnel steel cage operating equipment, so there is no need to set annular positioning bars to provide support, and there is no problem of not meeting the requirements of relevant design and construction specifications.

[0030] In this embodiment, the secondary lining steel cage does not include horizontal positioning bars. In the prior art, horizontal positioning bars are needed to control the distance between the inner annular bars and the inner wall of the tunnel and serve as the attachment points of the inner annular bars. In this application, the inner annular bars are arranged by tunnel steel cage operation equipment. During the operation, the tunnel steel cage operation equipment provides positioning and support for the inner annular bars, so there is no need to set horizontal positioning bars, which can save steel materials and simplify the operation process.

[0031] Example 2 Then, the present invention also discloses a synchronous binding method of a secondary lining steel cage, which in one embodiment comprises the following steps: Step A1, using tunnel reinforcement cage operation equipment to synchronously lay out inner annular reinforcement and outer annular reinforcement; Step A2, tying the inner distribution reinforcement and the outer distribution reinforcement to form the inner and outer steel meshes, and simultaneously fixing the supporting reinforcement between the inner and outer steel meshes; Step A3, tie hook bars and / or limit bars.

[0032] Specifically, step A2 includes: Step A21, positioning the inner and outer annular ribs from left to right along the tunnel annular direction; Step A22, following the progress of step A21, ties the inner and outer distribution bars to complete the positioning of the inner and outer annular bars, and fixes the supporting bars in the sandwich of the inner and outer steel meshes.

[0033] More specifically, step A21 includes: Step A211, the inner and outer guide wheels of the tunnel reinforcement cage operation equipment are positioned on the left side of the tunnel, the inner annular reinforcement is laid on the inner guide wheel, and the outer annular reinforcement is laid on the outer guide wheel; Step A212, the left ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the left side; Step A213, the inner and outer guide wheels move synchronously from left to right along the tunnel annular direction, and push the inner and outer annular ribs from left to right to the preset positions respectively; Step A214, the right ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the right side.

[0034] In this embodiment, step A22 includes: Step A221, following the rear side of the inner and outer guide wheels in the moving direction, tying the inner and outer distribution bars to form the inner and outer steel meshes; Step A222, following the rear side of the inner and outer distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer of the inner and outer steel meshes.

[0035] The tunnel steel cage operating equipment has an inner steel bar guide assembly and an outer steel bar guide assembly, which can limit the inner annular reinforcement and the outer annular reinforcement at the same time. During synchronous construction, since the support mechanism of the tunnel steel cage operating equipment only supports the inner steel mesh, in order to prevent the outer steel mesh from collapsing downward, it is necessary to install support bars simultaneously to transfer the supporting force of the tunnel steel cage operating equipment to the outer steel mesh in time. By setting the above steps, the above purpose can be achieved. During or after the tying of the inner and outer steel meshes, the hook bars and / or limit bars can be tied sequentially or synchronously according to the on-site arrangement.

[0036] The two ends of the inner and outer steel meshes are respectively connected to the inverted arch steel bars embedded in the tunnel. By setting hook bars and support bars on the inner and outer steel meshes at the same time, the hook bars provide reverse tension for the inner and outer steel meshes, and the support bars provide reverse thrust for the inner and outer steel bars, and the direction of the tension provided by the hook bars is opposite to the direction of the thrust provided by the support bars, so that the inner and outer steel meshes are relatively fixed along the radial direction of the tunnel. At this time, the inner and outer steel meshes are connected as a whole to form a thick structure. During the steel bar binding process, the tunnel steel cage operation equipment is set on the inner side of the inner steel mesh and provides it with support force outward along the radial direction of the tunnel. By setting support bars, the support force received by the inner steel mesh can be transmitted to the outer side of the outer steel mesh by the support bars, thereby achieving the purpose of using the tunnel steel cage operation equipment to support the entire steel cage.

[0037] In the prior art, the inner and outer steel meshes are connected only by existing hook bars (equivalent to the hook bars in this application), and the existing hook bars only have a pulling effect on the two, and the tension of the existing hook bars on the existing inner steel mesh (equivalent to the inner steel mesh in this application) is radially outward along the tunnel, and the tension on the existing outer steel mesh (equivalent to the outer steel mesh in this application) is radially inward along the tunnel, which cannot prevent the inner and outer steel meshes from being close to each other. Therefore, if the tunnel steel cage operating equipment is used to support the existing inner steel mesh, the supporting force cannot be transmitted to the existing outer steel mesh, so it is impossible to prevent the existing outer steel mesh from deforming and collapsing toward the existing inner steel mesh. In addition, in order to achieve fixation, the steel cage in the prior art needs to additionally set up existing annular positioning bars and existing external horizontal positioning bars, and the existing annular positioning bars are also in contact with the inner wall of the tunnel, so that it cannot meet the relevant design and construction specifications. In the technical solution disclosed in the present application, since the existing annular positioning bars and the existing horizontal positioning bars are eliminated, a large amount of steel can be saved while meeting the regulatory requirements, and it can be adapted to the operating mode of the tunnel reinforcement cage operating equipment, thereby greatly improving the construction efficiency and saving construction manpower.

[0038] Example 3 Then, the present invention also discloses a step-by-step binding method for a secondary lining steel cage, which in one embodiment comprises the following steps: Step B1, using tunnel reinforcement cage operation equipment to lay out the outer annular reinforcement; Step B2, tying the outer distribution reinforcement to form an outer steel mesh; Step B3, using tunnel reinforcement cage operation equipment to lay out inner annular reinforcement; Step B4, tying the inner distribution reinforcement to form an inner layer of steel mesh, and simultaneously fixing the support reinforcement between the inner and outer layers of steel mesh; Step B5, tie hook reinforcement and / or limit reinforcement.

[0039] Specifically, step B2 is: positioning the outer annular reinforcement from left to right along the circumferential direction of the tunnel, and following the progress of positioning, tying the outer distribution reinforcement to complete the positioning of the outer annular reinforcement.

[0040] Further, step B2 comprises: Step B21, the outer guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the outer annular reinforcement is laid on the outer guide wheel; Step B22, the left end of the outer annular reinforcement is connected to the invert reinforcement located on the left side; Step B23, the outer guide wheel moves from left to right along the tunnel annular direction, pushing the outer annular rib from left to right to a preset position; Step B24, the right end of the outer annular reinforcement is connected to the invert reinforcement located on the right side; Step B25, following the rear side of the moving direction of the outer guide wheel, tying the outer distribution reinforcement to form an outer layer of steel mesh.

[0041] Specifically, step B3 is: positioning the inner annular reinforcement from left to right along the tunnel circumference; and following the progress of positioning, tying the inner distribution reinforcement to complete the positioning of the inner annular reinforcement; and at the same time, following the progress of tying, fixing the supporting reinforcement in the sandwich layer of the inner and outer steel meshes.

[0042] Further, step B3 includes: Step B31, the inner guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the inner annular reinforcement is laid on the inner guide wheel; Step B32, the left end of the inner annular reinforcement is connected to the invert reinforcement located on the left side; Step B33, the inner guide wheel moves from left to right along the tunnel annular direction, pushing the inner annular rib from left to right to a preset position; Step B34, the right end of the inner annular reinforcement is connected to the invert reinforcement located on the right side; Step B35, following the rear side of the moving direction of the inner guide wheel, tying the inner distribution reinforcement to form an inner layer of steel mesh; Step B36, following the rear side of the inner distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer between the inner and outer steel meshes.

[0043] The tunnel steel cage operating equipment has a steel bar guide assembly for limiting the inner annular reinforcement and the outer annular reinforcement. Since the tunnel steel cage operating equipment is located on the inner side of the steel cage, it can only provide support from the inside to the outside. When performing step-by-step construction, it is necessary to first tie and form the outer steel mesh. At this time, the support mechanism of the tunnel steel cage operating equipment can provide support for the outer annular reinforcement. When tying the inner steel mesh, it is necessary to fix the support bars simultaneously. At this time, the support mechanism of the tunnel steel cage operating equipment gradually changes from providing support for the outer annular reinforcement to providing support for the inner annular reinforcement. By fixing the support bars simultaneously, the support force exerted on the inner steel mesh can be transferred to the outer steel mesh, thereby avoiding deformation. By setting the above steps, the above purposes can be achieved. During or after the tying of the inner and outer steel meshes, the hook bars and / or limiting bars can be tied sequentially or synchronously according to the on-site arrangements.

[0044] The two ends of the inner and outer steel meshes are respectively connected to the inverted arch steel bars embedded in the tunnel. By setting hook bars and support bars on the inner and outer steel meshes at the same time, the hook bars provide reverse tension for the inner and outer steel meshes, and the support bars provide reverse thrust for the inner and outer steel bars, and the direction of the tension provided by the hook bars is opposite to the direction of the thrust provided by the support bars, so that the inner and outer steel meshes are relatively fixed along the radial direction of the tunnel. At this time, the inner and outer steel meshes are connected as a whole to form a thick structure. During the steel bar binding process, the tunnel steel cage operation equipment is set on the inner side of the inner steel mesh and provides it with support force outward along the radial direction of the tunnel. By setting support bars, the support force received by the inner steel mesh can be transmitted to the outer side of the outer steel mesh by the support bars, thereby achieving the purpose of using the tunnel steel cage operation equipment to support the entire steel cage.

[0045] In the prior art, the inner and outer steel meshes are connected only by existing hook bars (equivalent to the hook bars in this application), and the existing hook bars only have a pulling effect on the two, and the tension of the existing hook bars on the existing inner steel mesh (equivalent to the inner steel mesh in this application) is radially outward along the tunnel, and the tension on the existing outer steel mesh (equivalent to the outer steel mesh in this application) is radially inward along the tunnel, which cannot prevent the inner and outer steel meshes from being close to each other. Therefore, if the tunnel steel cage operating equipment is used to support the existing inner steel mesh, the supporting force cannot be transmitted to the existing outer steel mesh, so it is impossible to prevent the existing outer steel mesh from deforming and collapsing toward the existing inner steel mesh. In addition, in order to achieve fixation, the steel cage in the prior art needs to additionally set up existing annular positioning bars and existing external horizontal positioning bars, and the existing annular positioning bars are also in contact with the inner wall of the tunnel, so that it cannot meet the relevant design and construction specifications. In the technical solution disclosed in the present application, since the existing annular positioning bars and the existing horizontal positioning bars are eliminated, a large amount of steel can be saved while meeting the regulatory requirements, and it can be adapted to the operating mode of the tunnel reinforcement cage operating equipment, thereby greatly improving the construction efficiency and saving construction manpower.

[0046] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are relative concepts for the convenience of understanding. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying a specific orientation and direction of operation that the device or element referred to must have. Therefore, they cannot be understood as limitations on the present invention.

[0047] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A secondary lining steel cage, comprising an inner steel mesh (1) and an outer steel mesh (2) which can be constructed by tunnel steel cage operation equipment, wherein the inner steel mesh (1) and the outer steel mesh (2) are arranged at intervals, and characterized in that: The inner steel mesh (1) and the outer steel mesh (2) are provided with a plurality of hook bars (3) connected to the inner steel mesh (1) and the outer steel mesh (2) and tightening the inner steel mesh (1) and the outer steel mesh (2) inwardly approximately along the radial direction of the tunnel, and a plurality of support bars (4) are sandwiched between the inner steel mesh (1) and the outer steel mesh (2) and abutting against the inner steel mesh (1) and providing an outward thrust to the inner steel mesh (1) and the outer steel mesh (2) inwardly approximately along the radial direction of the tunnel.

2. The secondary lining steel cage according to claim 1 is characterized in that: The inner layer steel mesh (1) comprises a plurality of inner annular ribs (11) and a plurality of inner distribution ribs (12) located on the outside thereof and connected in a cross-connection manner; the outer layer steel mesh (2) comprises a plurality of outer annular ribs (21) and a plurality of outer distribution ribs (22) located on the inside thereof and connected in a cross-connection manner; two ends of the support ribs (4) respectively abut against the inner distribution ribs (12) and the outer distribution ribs (22).

3. The secondary lining steel cage according to claim 1 is characterized in that: The steel cage further comprises a plurality of limiting ribs (5) arranged along the radial direction of the tunnel. The limiting ribs (5) are respectively fixed to the inner steel mesh (1) and the outer steel mesh (2), and one end of each limiting rib is connected to the tunnel wall.

4. The secondary lining steel cage according to claim 3 is characterized in that: The tail sections of the limiting ribs (5) are bent and fit against the tunnel wall, and the tail sections are arranged in disorder in various directions.

5. The secondary lining steel cage according to claim 2 is characterized in that: The support ribs (4) are configured as "J"-shaped horse stool ribs, including a middle transverse rib, wherein the two ends of the middle transverse rib are respectively bent vertically toward the same side to form two sections of vertical ribs, and one end of the two sections of vertical ribs is bent vertically in the opposite direction away from the middle transverse rib to form two sections of tail transverse ribs, wherein the tail transverse ribs are perpendicular to the middle transverse ribs; the middle transverse ribs are abutted against at least one inner annular rib (11), and each of the tail transverse ribs is abutted against at least one outer annular rib (21).

6. The secondary lining steel cage according to any one of claims 1 to 5, characterized in that: The secondary lining steel cage does not include annular positioning bars.

7. The secondary lining steel cage according to any one of claims 1 to 5, characterized in that: The secondary lining steel cage does not include horizontal positioning bars.

8. A synchronous binding method for secondary lining steel cage, characterized in that: The following steps are involved: Step A1, using tunnel reinforcement cage operation equipment to synchronously lay out inner annular reinforcement and outer annular reinforcement; Step A2, tying the inner distribution reinforcement and the outer distribution reinforcement to form the inner and outer steel meshes, and simultaneously fixing the supporting reinforcement between the inner and outer steel meshes; Step A3, tying hook reinforcement and / or limiting reinforcement; Wherein, the step A2 comprises: Step A21, positioning the inner and outer annular ribs from left to right along the tunnel annular direction; Step A22, following the progress of step A21, ties the inner and outer distribution bars to complete the positioning of the inner and outer annular bars, and fixes the supporting bars in the sandwich of the inner and outer steel meshes.

9. The synchronous binding method of the secondary lining steel cage according to claim 8 is characterized in that: The step A21 comprises: Step A211, the inner and outer guide wheels of the tunnel reinforcement cage operation equipment are positioned on the left side of the tunnel, the inner annular reinforcement is laid on the inner guide wheel, and the outer annular reinforcement is laid on the outer guide wheel; Step A212, the left ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the left side; Step A213, the inner and outer guide wheels move synchronously from left to right along the tunnel annular direction, and push the inner and outer annular ribs from left to right to the preset positions respectively; Step A214, the right ends of the inner and outer annular reinforcements are respectively connected to the invert reinforcement located on the right side; The step A22 comprises: Step A221, following the rear side of the inner and outer guide wheels in the moving direction, tying the inner and outer distribution bars to form the inner and outer steel meshes; Step A222, following the rear side of the inner and outer distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer of the inner and outer steel meshes.

10. A step-by-step binding method for a secondary lining steel cage, characterized in that: The following steps are involved: Step B1, using tunnel reinforcement cage operation equipment to lay out the outer annular reinforcement; Step B2, tying the outer distribution reinforcement to form an outer steel mesh; Step B3, using tunnel reinforcement cage operation equipment to lay out inner annular reinforcement; Step B4, tying the inner distribution reinforcement to form an inner layer of steel mesh, and simultaneously fixing the support reinforcement between the inner and outer layers of steel mesh; Step B5, tie hook reinforcement and / or limit reinforcement.

11. The step-by-step binding method of the secondary lining steel cage according to claim 10 is characterized in that: The step B2 is: using the tunnel reinforcement cage operation equipment to position the outer annular reinforcement from left to right along the tunnel circumference, and following the progress of the positioning, tying the outer distribution reinforcement to complete the positioning of the outer annular reinforcement; The step B2 comprises: Step B21, the outer guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the outer annular reinforcement is laid on the outer guide wheel; Step B22, the left end of the outer annular reinforcement is connected to the invert reinforcement located on the left side; Step B23, the outer guide wheel moves from left to right along the tunnel annular direction, pushing the outer annular rib from left to right to a preset position; Step B24, the right end of the outer annular reinforcement is connected to the invert reinforcement located on the right side; Step B25, following the rear side of the moving direction of the outer guide wheel, tying the outer distribution reinforcement to form an outer layer of steel mesh.

12. The step-by-step binding method of the secondary lining steel cage according to claim 10 is characterized in that: The step B3 is: positioning the inner annular reinforcement from left to right along the tunnel circumference; and following the progress of positioning, tying the inner distribution reinforcement to complete the positioning of the inner annular reinforcement; and simultaneously following the progress of tying, fixing the support reinforcement in the sandwich of the inner and outer steel meshes; The step B3 comprises: Step B21, the inner guide wheel of the tunnel reinforcement cage operation equipment is positioned on the left side of the tunnel, and the inner annular reinforcement is laid on the inner guide wheel; Step B22, the left end of the inner annular reinforcement is connected to the invert reinforcement located on the left side; Step B23, the inner guide wheel moves from left to right along the tunnel annular direction, pushing the inner annular rib from left to right to a preset position; Step B24, the right end of the inner annular reinforcement is connected to the invert reinforcement located on the right side; Step B25, following the rear side of the moving direction of the inner guide wheel, tying the inner distribution reinforcement to form an inner layer of steel mesh; Step B26, following the rear side of the inner distribution reinforcement binding direction, fix the supporting reinforcement in the sandwich layer between the inner and outer steel meshes.

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