Reinforced concrete formwork composite arch cover support structure

Abstract

The utility model belongs to the technical field of tunnel construction, and specifically relates to a reinforced concrete molded superimposed arch cover support structure, including a first support and a second support, wherein the first support is a buckle support, and the second support includes a longitudinal beam I, an oblique support I and a top support I, wherein the longitudinal beam I is against the main rib of the arc-shaped arch frame, one end of the oblique support I is against the foundation, and the other end of the oblique support I is connected to the top support I, and the longitudinal beam I can be engaged with the top support I. In the utility model, the first support is used to vertically support the concrete casting template, and the second support is used to obliquely support the concrete casting template, so that the concrete casting template is subjected to an oblique upward thrust, thereby strengthening the support effect on the concrete casting template; and the second support can share the load borne by the first support, thereby reducing the load borne by the first support, improving the overall stability of the support system, so that the support system has sufficient rigidity, strength and stability, and can reliably withstand the weight, lateral pressure and other construction loads during concrete casting, effectively solving the problem of poor stability of the full-house buckle support when supporting the reinforced concrete molded superimposed arch cover template.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, and in particular relates to a reinforced concrete molded superimposed arch cover support structure. Background Art

[0002] The superimposed primary support arch cover method is a concealed excavation construction method in which a double-layer superimposed primary support arch cover is set on the arch part. After the construction of the first layer of primary support is completed, the superimposed arch cover can be constructed after the construction of the lower beam (large arch foot), that is, the arch cover part of the second layer of primary support can be constructed after the construction of the lower beam. If the superimposed arch cover adopts the reinforced concrete mold casting method, a bracket system is required to support the reinforced concrete casting formwork. At present, the full-chamber buckle bracket is mainly used as the bracket system for reinforced concrete casting formwork. However, when the full-chamber buckle bracket supports the arch concrete casting formwork, during the concrete pouring process, the force applied by the reinforced concrete casting formwork to the full-chamber buckle bracket includes horizontal force and vertical force, and along the direction close to the lower beam, the horizontal force applied by the reinforced concrete casting formwork to the full-chamber buckle bracket gradually increases, and the buckle bracket near the horizontal beam is subjected to a large extrusion force, resulting in horizontal deformation, thereby reducing the stability of the full-chamber buckle bracket. Utility Model Content

[0003] The utility model aims to provide a reinforced concrete mold-built superimposed arch cover support structure to solve the problem of poor stability of the full-height buckle support when supporting the reinforced concrete mold-built superimposed arch cover template.

[0004] In order to achieve the above-mentioned purpose, the scheme of the utility model is: a reinforced concrete form-cast composite arch cover support structure, comprising a first support and a second support, the first support is a disc-shaped support, the second support comprises a longitudinal beam I, an oblique support I and a top support I, the longitudinal beam I is abutted against the main rib of the arc-shaped arch frame, one end of the oblique support I is abutted against the foundation, the other end of the oblique support I is connected to the top support I, and the longitudinal beam I can be engaged with the top support I.

[0005] The working principle and beneficial effects of this solution are as follows: the concrete casting formwork close to the underlying beam is fixed by anchoring through holes in the main ribs of the arc-shaped arch frame. Therefore, in this solution, the first bracket is used to vertically support the concrete casting formwork, and the second bracket is used to obliquely support the main ribs of the arc-shaped arch frame, thereby achieving oblique support for the concrete casting formwork, so that the concrete casting formwork is subjected to an oblique upward thrust, thereby enhancing the supporting effect on the concrete casting formwork; and, in this solution, the second bracket can share the load borne by the first bracket, thereby reducing the load borne by the first bracket, improving the overall stability of the bracket system, and making the bracket system have sufficient rigidity, strength and stability, and can reliably withstand the weight, lateral pressure and other construction loads during concrete pouring.

[0006] Optionally, the second bracket also includes a limiting member for limiting the end of the oblique support I close to the foundation.

[0007] In this solution, a limiting member is used to limit the bottom end of the oblique support I to prevent the bottom end of the oblique support I from sliding horizontally during the supporting process.

[0008] Optionally, the limiting member is a limiting block, and the limiting block is integrally formed with the foundation.

[0009] In this scheme, an excavator is used to remove the soft soil on the surface of the two sides and the bottom plate of the middle guide tunnel, and compact it. After compaction, 20cm C20 concrete is hardened as the foundation, and a limit block is formed on the foundation at the same time. In this way, the bottom end of the inclined support I is against the limit block, which can prevent the bottom end of the inclined support I from sliding toward the center line of the tunnel.

[0010] Optionally, the limiting member is a limiting plate, which is L-shaped. The L-shaped limiting plate includes a horizontal plate and a vertical plate. The vertical plate abuts against the middle partition wall, and the horizontal plate is provided with a protruding portion that abuts against the bottom end of the oblique support I.

[0011] In this solution, the limit plate abuts against the middle partition wall, and the abutting protrusion on the limit plate provides a tightening point for the bottom end of the oblique support I, thereby preventing the bottom end of the oblique support I from sliding toward the center line of the tunnel.

[0012] Optionally, the horizontal plate is provided with a plurality of transverse reinforcing ribs and a plurality of longitudinal reinforcing ribs.

[0013] In this solution, the transverse and longitudinal reinforcement ribs are provided to not only strengthen the strength of the horizontal plate, but also form a number of rectangular depressions for the bottom end of the oblique support I to sink into, that is, the transverse and longitudinal reinforcement ribs form a convex portion.

[0014] Optionally, the second bracket also includes a longitudinal beam II, an oblique support II and a top support II, the longitudinal beam II is abutted against the main rib of the arc-shaped arch frame, one end of the oblique support II is abutted against the foundation, and the other end of the oblique support II is connected to the top support II, and the longitudinal beam II can be engaged with the top support II; the bottom end of the oblique support II is abutted against the bottom end of the corresponding oblique support I, and the inclination direction of the oblique support II is opposite to that of the abutting oblique support I.

[0015] In this scheme, the oblique support II provides oblique support to the main rib of the arc-shaped arch frame near the arch top, and the inclination direction of the oblique support II is opposite to that of the oblique support I. At the same time, the bottom end of the oblique support II is against the bottom end of the corresponding oblique support I, so that the oblique support II and the corresponding oblique support I interact with each other, which can effectively prevent the bottom ends of the oblique support II and the corresponding oblique support I from sliding horizontally, thereby further improving the overall stability of the support system.

[0016] Optionally, the first bracket includes a vertical pole, a horizontal pole, a vertical diagonal pole, an adjustable base and an adjustable bracket.

[0017] In this solution, the first bracket is a conventional disc bracket, which is distributed on both sides of the tunnel and the central guide hole, and is adjusted to the required height through an adjustable bracket.

[0018] Optionally, the first bracket further includes a horizontal diagonal rod.

[0019] In this solution, the horizontal diagonal rods connect the vertical rods in the horizontal direction, thereby improving the integrity of the first bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a reinforced concrete molded superimposed arch cover support structure in a tunnel section in the first embodiment of the utility model;

[0021] Figure 2 It is a schematic structural diagram of the reinforced concrete molded superimposed arch cover support structure in another tunnel section in the first embodiment of the utility model;

[0022] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0023] Figure 4 This is a structural schematic diagram of a reinforced concrete molded superimposed arch cover support structure in Embodiment 2 of the present utility model;

[0024] Figure 5 This is a structural schematic diagram of a reinforced concrete molded superimposed arch cover support structure in Embodiment 3 of the present utility model;

[0025] Figure 6 This is a structural schematic diagram of a reinforced concrete molded superimposed arch cover support structure in Embodiment 4 of the present utility model;

[0026] Figure 7 It is a top view of the limiting plate in the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The marks in the drawings of the specification include: a first bracket 100, a vertical pole 101, a horizontal pole 102, a vertical diagonal pole 103, a horizontal diagonal pole 104, a second bracket 200, a longitudinal beam I 201, an oblique support I 202, a top support I 203, an adjusting wrench 2031, a top support rod 2032, a U-shaped support 2033, a longitudinal beam II 204, an oblique support II 205, a top support II 206, a limit block 207, a limit plate 208, a convex portion 2081, a main rib of an arc arch 300, a foundation 400, a concrete pouring template 500, a transverse reinforcement rib 601, and a longitudinal reinforcement rib 602.

[0029] Embodiment 1

[0030] This embodiment is basically Figure 1 and Figure 2 As shown: a reinforced concrete form-cast composite arch cover support structure includes a first support 100 and a second support 200. The first support 100 is a buckle support, and the first support 100 includes a vertical pole 101, a horizontal pole 102, a vertical diagonal pole 103, a horizontal diagonal pole 104, an adjustable base and an adjustable bracket. Specifically, the frame of each guide hole is an independent tower frame. The erection of the first bracket 100 starts from the bottom, and the vertical poles 101 and the horizontal poles 102 are arranged according to the design drawings. After adjusting the verticality and position of the vertical poles 101, the wheel buckles are fastened. After the installation of one layer of vertical poles 101 and horizontal poles 102, the second layer of vertical poles 101 and horizontal poles 102 are installed until the top layer. The vertical poles 101 are arranged in a staggered manner with standard vertical poles 101 of 1.0m, 1.5m, and 2.0m. The vertical distance between the staggered vertical poles 101 should not be less than 50cm. The connecting sleeves of the vertical poles 101 and the vertical poles 101 should be provided with anti-pullout pin holes for fixing the vertical pole 101 connectors. The diameter of the small holes should not be greater than 14mm, and the allowable dimensional deviation should be ±0.1mmm. The diameter of the vertical pole 101 connector should be 12mm, and the allowable dimensional deviation is ±0.1mm.

[0031] The vertical diagonal rods 103 are set throughout the length, the spacing type of the vertical rods 101 is 90*60cm, the diagonal rods are set strictly according to the plan, and scissors braces are added to the outermost layer (using D48 ordinary steel pipes), and locked with two steel pipe fasteners at the steel pipe connections. The scissors braces are set continuously according to the specifications to ensure the overall stability of the bracket. The site can be adjusted appropriately according to the actual situation, but the erection requirements must refer to the current specifications for erection. The diagonal rod erection requirements are as follows: The maximum erection height of this plan is 8.2m, the vertical diagonal rods 103 are fully set, the layout of the cross bar 102 is 1.2m, and horizontal diagonal rods 104 are set at standard steps along the top of the height, the third span, and the fifth span. The lateral arch node position is reinforced with Φ89, t=6mm thick steel pipe diagonal braces.

[0032] The cantilever length of the adjustable bracket extending from the top cross bar 102 or the double-slot steel joist is strictly prohibited from exceeding 650mm, and the exposed length of the screw rod is strictly prohibited from exceeding 400mm. The exposed length of the adjustable base adjustment screw rod should not be greater than 300mm. The height of the lowest cross bar 102 serving as a sweeping rod from the ground should not be greater than 550mm. The length of the adjustable bracket inserted into the vertical pole 101 or the double-slot steel joist shall not be less than 150mm.

[0033] In addition, a 50 cm standard section is provided at the top position of the vertical pole 101 for independent adjustment, and an inclined support Ⅰ202 is independently provided on the adjustment section to be connected with the frame as a whole.

[0034] The second bracket 200 includes a longitudinal beam Ⅰ201, an oblique support Ⅰ202 and a top support Ⅰ203. The longitudinal beam Ⅰ201 abuts against the main rib 300 of the arc-shaped arch frame, one end of the oblique support Ⅰ202 abuts against the foundation 400, and the other end of the oblique support Ⅰ202 is connected to the top support Ⅰ203. The longitudinal beam Ⅰ201 can be engaged with the top support Ⅰ203. The second bracket 200 is distributed in the left and right guide holes. There are three oblique supports Ⅰ202 in each guide hole. The oblique supports Ⅰ202 and the longitudinal beam Ⅰ201 are both made of Φ89 steel pipes, combined with Figure 3 As shown, the oblique support Ⅰ202 is abutted against the adjusting wrench 2031 of the top support Ⅰ203, the adjusting wrench 2031 is threadedly connected to the top support rod 2032 of the top support Ⅰ203, and the longitudinal beam Ⅰ201 is located in the U-shaped support 2033 of the top support Ⅰ203. In this way, by rotating the adjusting wrench 2031 so that the adjusting wrench 2031 moves axially along the top support rod 2032, the supporting length of the second bracket 200 can be adjusted.

[0035] In addition, in this embodiment, the concrete casting template 500 (i.e., reinforced concrete molded superimposed arch cover template) is made of a P3015 small steel mold, and the concrete casting template 500 is fixed by perforating and anchoring the arc-shaped arch frame main rib 300. The soft soil on the surface is removed by an excavator on both sides and the bottom plate of the middle guide hole, and compacted, and then hardened 20cm C20 concrete is used as the foundation 400.

[0036] In this embodiment, the first bracket 100 supports the concrete casting template 500 vertically, and the second bracket 200 supports the arc-shaped arch frame main rib 300 obliquely I202, so that the arc-shaped arch frame main rib 300 is subjected to an oblique upward thrust, thereby causing the concrete casting template 500 to be subjected to an oblique upward thrust, thereby strengthening the support effect on the concrete casting template 500; and in this embodiment, the second bracket 200 can share the load borne by the first bracket 100, thereby reducing the load borne by the first bracket 100, improving the overall stability of the bracket system, and making the bracket system have sufficient rigidity, strength and stability, and can reliably withstand the weight, lateral pressure and other construction loads during concrete casting. Compared with the method of using only a buckle bracket for concrete casting template 500, this embodiment can share the load borne by the buckle bracket, thereby reducing the burden of the buckle bracket and avoiding stability problems of the buckle bracket.

[0037] Embodiment 2

[0038] The difference between this embodiment and the first embodiment is that: Figure 4 As shown, the second bracket 200 also includes a longitudinal beam II 204, an oblique support II 205 and a top support II 206. The longitudinal beam II 204 abuts against the main rib 300 of the arc-shaped arch frame, one end of the oblique support II 205 abuts against the foundation 400, and the other end of the oblique support II 205 is connected to the top support II 206. The longitudinal beam II 204 can be engaged with the top support II 206; the bottom end of the oblique support II 205 abuts against the bottom end of the corresponding oblique support I 202, and the inclination direction of the oblique support II 205 and the abutting oblique support I 202 are opposite.

[0039] In this embodiment, the oblique support II 205 applies an oblique upward thrust to the arc-shaped arch main rib 300, thereby sharing the load borne by the first bracket 100. In addition, the bottom end of the oblique support II 205 abuts against the bottom end of the corresponding oblique support I 202, which can effectively prevent the bottom end of the oblique support I 202 from sliding toward the tunnel centerline, and can also effectively prevent the bottom end of the oblique support II 205 from sliding away from the tunnel centerline, thereby ensuring the support of the second bracket 200 for the concrete casting template 500.

[0040] Embodiment 3

[0041] The difference between this embodiment and the first embodiment is that: Figure 5 As shown, the second bracket 200 also includes a stopper for limiting the end of the oblique support Ⅰ202 close to the foundation 400, and the stopper is used to prevent the bottom end of the oblique support Ⅰ202 from sliding toward the tunnel centerline. Specifically, the stopper is a stopper block 207, and the stopper block 207 is integrally formed with the foundation 400.

[0042] Embodiment 4

[0043] The difference between this embodiment and the first embodiment is that: Figure 6 As shown, the second bracket 200 also includes a stopper for limiting the end of the oblique support I 202 close to the foundation 400, and the stopper is used to prevent the bottom end of the oblique support I 202 from sliding toward the center line of the tunnel. Specifically, the stopper is a stopper plate 208, and the stopper plate 208 is L-shaped. The L-shaped stopper plate 208 includes a horizontal plate and a vertical plate, and the vertical plate abuts against the middle partition wall. The horizontal plate is provided with a protruding portion 2081 that abuts against the bottom end of the oblique support I 202.

[0044] In this embodiment, the vertical plate abuts against the middle partition wall, thus preventing the limit plate 208 from sliding toward the tunnel centerline after receiving the thrust. The abutting protrusion 2081 on the horizontal plate can abut against the oblique support I 202, thereby preventing the oblique support I 202 from sliding toward the tunnel centerline.

[0045] Embodiment 5

[0046] The difference between this embodiment and the fourth embodiment is that: Figure 7 As shown, the horizontal plate is also provided with a plurality of transverse reinforcing ribs 601 and a plurality of longitudinal reinforcing ribs 602. In this embodiment, the transverse reinforcing ribs 601 and the longitudinal reinforcing ribs 602 on the horizontal plate can strengthen the strength of the horizontal plate, and the transverse reinforcing ribs 601 and the longitudinal reinforcing ribs 602 can form a plurality of rectangular depressions for the bottom end of the oblique support I 202 to sink into, thereby preventing the oblique support I 202 from sliding toward the center line of the tunnel. That is, in this embodiment, the longitudinal reinforcing ribs 602 serve as the abutting convex portion 2081.

[0047] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model. For example, the limiters in the third and fourth embodiments are applied to the second embodiment, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the utility model. The specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A reinforced concrete molded composite arch cover support structure, characterized in that: It includes a first bracket and a second bracket, the first bracket is a buckle bracket, and the second bracket includes a longitudinal beam I, an oblique support I and a top support I, the longitudinal beam I is against the main rib of the arc-shaped arch frame, one end of the oblique support I is against the foundation, and the other end of the oblique support I is connected to the top support I, and the longitudinal beam I can be engaged with the top support I.

2. The reinforced concrete molded composite arch cover support structure according to claim 1, characterized in that: The second bracket also includes a limiting member for limiting the end of the oblique support I close to the foundation.

3. The reinforced concrete molded composite arch cover support structure according to claim 2 is characterized in that: The limiting component is a limiting block, and the limiting block is integrally formed with the foundation.

4. The reinforced concrete molded composite arch cover support structure according to claim 2, characterized in that: The limiting member is a limiting plate, which is L-shaped. The L-shaped limiting plate includes a horizontal plate and a vertical plate. The vertical plate abuts against the middle partition wall, and the horizontal plate is provided with an abutting protrusion that abuts against the bottom end of the oblique support I.

5. The reinforced concrete molded composite arch cover support structure according to claim 4, characterized in that: The horizontal plate is provided with a plurality of transverse reinforcing ribs and a plurality of longitudinal reinforcing ribs.

6. The reinforced concrete molded composite arch cover support structure according to claim 1, characterized in that: The second bracket also includes a longitudinal beam II, an oblique support II and a top support II. The longitudinal beam II is abutted against the main rib of the arc-shaped arch frame, one end of the oblique support II is abutted against the foundation, and the other end of the oblique support II is connected to the top support II. The longitudinal beam II can be engaged with the top support II; the bottom end of the oblique support II is abutted against the bottom end of the corresponding oblique support I, and the inclination direction of the oblique support II is opposite to that of the abutting oblique support I.

7. The reinforced concrete molded composite arch cover support structure according to claim 1, characterized in that: The first bracket comprises a vertical rod, a horizontal rod, a vertical diagonal rod, an adjustable base and an adjustable bracket.

8. The reinforced concrete molded composite arch cover support structure according to claim 7, characterized in that: The first bracket also includes a horizontal diagonal rod.

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