Combined inverted arch concrete pouring formwork allowing reserved lengthened steel bars to penetrate through

Abstract

The utility model provides a combined inverted arch concrete pouring formwork allowing a reserved lengthened steel bar to penetrate through. The combined inverted arch concrete pouring formwork comprises a tunnel inverted arch formwork connecting framework, a tunnel inverted arch formwork inserting plate, a T-shaped sealing inserting plate and a reserved lengthened steel bar penetrating hole sealing plug. The tunnel inverted arch template inserting plate is inserted between the tunnel inverted arch template connecting frameworks; the tunnel inverted arch template insertion plate is provided with a reserved sealing plate insertion groove; the T-shaped sealing inserting plate is inserted into the reserved sealing plate inserting groove, and the reserved lengthened steel bar penetrating hole sealing plug is inserted into a reserved lengthened steel bar penetrating hole of the T-shaped sealing inserting plate. The construction quality and efficiency of the tunnel inverted arch and the transportation efficiency of the tunnel inverted arch formwork can be effectively improved, the multiple reserved sealing plate inserting grooves are formed, the multiple reserved lengthened steel bar penetrating holes are formed in the reserved sealing plate inserting grooves, and the tunnel inverted arch formwork can adapt to tunnel pouring of various different designs.

Description

Technical Field

[0001] The present invention relates to tunnel formwork engineering, and specifically to a combined inverted arch concrete casting formwork that allows reserved extended steel bars to pass through. Background Art

[0002] In tunnel engineering, the inverted arch is an important structural part at the bottom of the tunnel, bearing the pressure from the upper soil mass and surrounding rock. Its construction quality is directly related to the stability and safety of the tunnel structure. Traditional tunnel inverted arch formworks usually adopt wooden formworks or small-piece combined steel formworks. These formworks have problems such as long construction periods, many reinforcement supports, poor integrity, large formwork consumption, and the inability of the longitudinal steel bars of the tunnel inverted arch to pass through the formwork and reserve a part. This not only increases the construction cost but also affects the quality and efficiency of tunnel construction.

[0003] The "Code for Design of Highway Tunnels" (JTG 3370.1 - 2018) and the "Construction Guide for Expressway Tunnels" (DB14 / T715 - 2018) clearly stipulate that "the cross-sectional area of the joints of the stressed steel bars within the 'same cross-section' shall not be greater than 50% of the total cross-sectional area of the stressed steel bars". Therefore, at the end formwork of each mold of inverted arch concrete, the steel bars shall not all be disconnected here. They must be staggered and lapped, and the staggering distance must be greater than 35d (d is the diameter of the steel bar). Therefore, at the end of each mold of inverted arch concrete, at least half of the steel bars should extend out and lap with the steel bars of the next mold of inverted arch concrete to ensure the overall stability of the inverted arch structure. It is not allowed to cut off the steel bars at the inverted arch concrete. The current method is to bend and hide the lapped steel bars inside the formwork. After the formwork is removed, find the bent lapped steel bars and straighten them again to facilitate lapping with the steel bars of the next mold of inverted arch. Repeated bending will damage the steel bars and is not beneficial to the overall stability structure of the inverted arch.

[0004] Currently, there is a lack of a combined inverted arch concrete casting formwork with reserved holes for the lapped steel bars of the inverted arch to pass through. Because the positions of the reserved holes in each mold are not consistent, it is difficult for the formwork with fixed reserved hole positions to adapt to the changes in the positions of the inverted arch steel bars, resulting in problems such as difficulty in sealing the reserved holes.

[0005] Therefore, it is necessary to develop a combined inverted arch concrete casting formwork that allows the reserved extended steel bars of the tunnel inverted arch to pass through, which can adapt to the changes in the reserved steel bars of each mold of the inverted arch, helps to improve the lapping quality of the inverted arch steel bars, and can efficiently seal the reserved hole positions, improving the convenience and efficiency of inverted arch concrete casting. Summary of the Utility Model

[0006] The purpose of the present utility model is to provide a combined inverted arch concrete casting formwork that allows reserved extended steel bars to pass through, so as to solve the problems raised in the background art.

[0007] To achieve the above object, the utility model provides a combined inverted arch concrete casting formwork for reserved extended reinforcing bars to pass through, which includes a tunnel inverted arch formwork connecting skeleton, a tunnel inverted arch formwork inserting plate, a T-shaped sealing inserting plate, and a reserved extended reinforcing bar passing hole sealing plug;

[0008] The tunnel inverted arch formwork inserting plate is inserted between the tunnel inverted arch formwork connecting skeletons; the tunnel inverted arch formwork inserting plate is provided with a reserved sealing plate slot; the T-shaped sealing inserting plate is inserted into the reserved sealing plate slot, and the reserved extended reinforcing bar passing hole sealing plug is inserted into the reserved extended reinforcing bar passing hole of the T-shaped sealing inserting plate.

[0009] Preferably, the tunnel inverted arch formwork connecting skeleton is composed of an intermediate connecting skeleton and an end connecting skeleton, and fixed inverted arch formwork inserting plate clamping grooves are arranged on one side of the end connecting skeleton and both sides of the intermediate connecting skeleton.

[0010] Preferably, the tunnel inverted arch formwork connecting skeleton is fixedly connected with an "L"-shaped steel plate, and the "L"-shaped steel plate is connected with a brace through a fixed inclined support screw.

[0011] Preferably, the area of the opening on the side of the reserved sealing plate slot facing the casting surface is larger than that on the other side, the shape of the hole is "convex" - shaped, and the opening of the reserved sealing plate slot is rectangular.

[0012] Preferably, the T-shaped sealing inserting plate includes a rectangular inserting plate and a rectangular clamping plate; the surface area of the rectangular clamping plate is larger than that of the rectangular inserting plate.

[0013] Preferably, the area of the opening on the side of the reserved extended reinforcing bar passing hole facing the casting surface is larger than that on the other side, the shape of the hole is "convex" - shaped, and the opening of the reserved extended reinforcing bar passing hole is circular.

[0014] Preferably, the reserved extended reinforcing bar passing hole sealing plug is provided with a plug and a fixed clamping plate, the cross-sectional area of the fixed clamping plate is larger than that of the plug; the shape of the reserved extended reinforcing bar passing hole sealing plug is "convex" - shaped, and both sides of the reserved extended reinforcing bar passing hole sealing plug are circular.

[0015] The utility model has the following beneficial effects:

[0016] The utility model / invention can enable a part of the longitudinal reinforcing bars of the tunnel inverted arch to pass through the formwork and be tied to the longitudinal reinforcing bars of the tunnel inverted arch to be cast later, improving the service performance and service life of the tunnel structure.

[0017] The utility model / invention can quickly connect, disassemble and support and fix each tunnel inverted arch formwork inserting plate and each T-shaped sealing inserting plate through fixed inverted arch formwork inserting plate clamping grooves on both sides of the tunnel inverted arch formwork connecting component, one brace and one "L"-shaped steel plate on one side, effectively improving the construction quality and efficiency of the tunnel inverted arch and the transportation efficiency of the tunnel inverted arch formwork.

[0018] The template splicing is convenient and efficient, and multiple reserved sealing plate slots are provided. Multiple reserved extended reinforcement passing holes are arranged in the reserved sealing plate slots, which can adapt to the tunnel pouring of various different designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0020] Figure 1 Construction result diagram of the in-situ cast inverted arch of the tunnel;

[0021] Figure 2 Partial view of the construction result diagram of the in-situ cast inverted arch of the tunnel;

[0022] Figure 3 Three-dimensional view of the connecting skeleton of the tunnel inverted arch formwork;

[0023] Figure 4 Three-dimensional view of the inserting plate of the tunnel inverted arch formwork;

[0024] Figure 5 Three-dimensional view of the T-shaped sealing inserting plate;

[0025] Figure 6 Three-dimensional view of the sealing plug for the reserved extended reinforcement passing hole;

[0026] In the figures: 1 - primary support, 2 - already cast inverted arch, 3 - inverted arch pouring section, 4 - reserved reinforcement, 5 - connecting skeleton of the tunnel inverted arch formwork, 51 - intermediate connecting skeleton, 52 - end connecting skeleton, 53 - fixed inverted arch formwork inserting plate slot, 54 - diagonal bracing rod, 55 - "L"-shaped steel plate, 56 - fixed diagonal bracing screw, 6 - inserting plate of the tunnel inverted arch formwork, 61 - reserved sealing plate slot, 7 - T-shaped sealing inserting plate, 71 - rectangular clamping plate, 72 - rectangular inserting plate, 73 - reserved extended reinforcement passing hole, 8 - sealing plug for the reserved extended reinforcement passing hole, 81 - fixed clamping plate, 82 - plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will describe in detail the embodiments of the present utility model / invention with reference to the accompanying drawings. However, the present utility model can be implemented in various different ways as defined and covered by the claims.

[0028] A combined inverted arch concrete pouring formwork for allowing reserved extended reinforcement to pass through includes a connecting skeleton 5 of the tunnel inverted arch formwork, an inserting plate 6 of the tunnel inverted arch formwork, a T-shaped sealing inserting plate 7, and a sealing plug 8 for the reserved extended reinforcement passing hole;

[0029] The tunnel invert formwork connecting skeleton 5 is composed of multiple intermediate connecting skeletons 51 and end connecting skeletons 52, and stainless steel is used as the main material. Fixed invert formwork inserting plate slots 53 are arranged on one side of the end connecting skeleton 52 and both sides of the intermediate connecting skeleton 51. The tunnel invert formwork inserting plate 6 is inserted between two tunnel invert formwork connecting skeletons 5 to strengthen the stability between the tunnel invert formwork connecting skeleton 5 and the tunnel invert formwork inserting plate 6. The tunnel invert formwork connecting skeleton 5 has a diagonal brace 54, which can keep the tunnel invert formwork stable after assembly. The tunnel invert formwork connecting skeleton 5 is fixedly connected to the "L"-shaped steel plate 5 5 , so that after the tunnel invert formwork is assembled, steel bars or wooden bars can be inserted into the "L"-shaped steel plates 55 of multiple tunnel invert formwork connecting skeletons 5 to keep the tunnel invert formwork stable. The "L"-shaped steel plate 55 is connected to the diagonal brace 54 through a fixed diagonal brace screw 56. The fixed diagonal brace screw 56 can be matched with a nut to adjust the tightness of the connection. The diagonal brace 54, the "L"-shaped steel plate 55, and the fixed diagonal brace screw 56 are all in the middle of one side of the skeleton, on the other side of the pouring surface.

[0030] The tunnel invert formwork inserting plate 6 uses high-strength plastic as the main material. Two rows of reserved sealing plate slots 61 are arranged on the tunnel invert formwork inserting plate 6. The openings of the reserved sealing plate slots 61 on the side facing the pouring surface are large and the other side is small, and the hole shape is "convex"-shaped. The openings of the reserved sealing plate slots 61 are rectangular.

[0031] The T-shaped sealing inserting plate 7 uses cis-butadiene rubber as the main material. The T-shaped sealing inserting plate 7 includes a rectangular inserting plate 72 and a rectangular clamping plate 71. The surface area of the rectangular clamping plate 71 is larger than that of the rectangular inserting plate 72 and matches the reserved sealing plate slot 61, so that the T-shaped sealing inserting plate 7 can be inserted into the tunnel invert formwork inserting plate 6 for quick installation and disassembly.

[0032] The T-shaped sealing inserting plate 7 has three rows of reserved extended reinforcing bar through holes 73 from top to bottom, which can allow the tunnel longitudinal reinforcing bars to pass through the tunnel invert formwork. The openings of the reserved extended reinforcing bar through holes 73 on the side facing the pouring surface are large and the other side is small, and the hole shape is "convex"-shaped. The openings of the holes 73 are circular.

[0033] The reserved extended reinforcing bar through hole sealing plug 8 uses high-strength plastic as the main material. The plastic reserved extended reinforcing bar through hole sealing plug 8 has a plug 82 and a fixed clamping plate 81, so that the reserved extended reinforcing bar through hole sealing plug 8 can be inserted into the reserved extended reinforcing bar through hole 73 in the T-shaped sealing inserting plate 7 where no reinforcing bar is inserted for quick installation and disassembly. The cross-sectional area of the fixed clamping plate 81 is larger than that of the plug 82, and the fixed clamping plate 81 faces the pouring surface. The shape of the reserved extended reinforcing bar through hole sealing plug 8 is "convex"-shaped, and both sides of the reserved extended reinforcing bar through hole sealing plug 8 are circular. And the holes of the reserved extended reinforcing bar through holes 73 where the reinforcing bars are inserted are well plugged for the second time to prevent the poured concrete from running out.

[0034] The fixed clamping plate 81, the rectangular clamping plate 71 and the tunnel invert formwork inserting plate 6 are on the same vertical plane to ensure the smoothness of the cast concrete. The reserved sealing plate slots 61, the holes 73, and the reserved extended reinforcement passing through hole seals 8 fit and match with each other, so the cast concrete will not flow out from the gaps of the reserved sealing plate slots 61 and the holes 73.

[0035] The construction process of using a combined invert concrete casting formwork that allows the reserved extended reinforcement to pass through is as follows:

[0036] After the tunnel invert steel bars are tied, it is used for invert concrete casting. 5 is the connecting skeleton, and both ends are firmly welded to the side walls. Before pouring the invert concrete, according to the pouring length of the invert, it is placed at the front end of the invert steel bars, and it is ensured that the reserved extended reinforcement protrudes 25d outside the formwork. Only one end of the invert needs to be sealed because the other end can use the already cast invert 2 as a formwork. As Figure 3 shown, the tunnel invert formwork connecting skeleton 5 is composed of an intermediate connecting skeleton 51 and an end connecting skeleton 52. The intermediate connecting skeleton 51 and the end connecting skeleton 52 are composed of a fixed invert formwork inserting plate slot 53, a diagonal brace 54, an "L"-shaped steel plate 55, and a fixed diagonal brace screw 56. The fixed invert formwork inserting plate slot 53, the diagonal brace 54, the "L"-shaped steel plate 55, and the fixed diagonal brace screw 56 are all in the middle of the skeleton and are located on the side away from the concrete casting. As Figure 4 shown, the tunnel invert formwork inserting plate 6 has a reserved sealing plate slot 61. The shape of the reserved sealing plate slot 61 is a "convex"-shaped hole, and the opening of the reserved sealing plate slot 61 is rectangular. Figure 5 shown, the T-shaped sealing inserting plate 7 is composed of a rectangular clamping plate 71, a rectangular inserting plate 72, and a reserved extended reinforcement passing through hole 73. The shape of the reserved extended reinforcement passing through hole 73 is a "convex"-shaped hole, and the opening of the hole 73 is circular. Figure 6 shown, the reserved extended reinforcement passing through hole seal 8 is composed of a fixed clamping plate 81 and a plug 82. The reserved extended reinforcement passing through hole seal 8 is "convex"-shaped, and both sides of the reserved extended reinforcement passing through hole seal 8 are circular.

[0037] When preparing to support the formwork, first use the fixed invert formwork inserting plate slots 53 on both sides of the tunnel invert formwork connecting skeleton 5 to connect each tunnel invert formwork inserting plate 6 into a whole. When connecting the tunnel invert formwork connecting skeleton 5, the side with the diagonal brace 54 should not face the tunnel invert pouring section. The side with the larger opening of the reserved sealing plate slot 61 of the tunnel invert formwork inserting plate 6 ( Figure 4The side (left side) faces the concrete pouring surface. Secondly, insert the T-shaped sealing plug 7 into the reserved sealing plate slot 61. Install the side without the diagonal strut 54 on the integral cast-in-place tunnel invert formwork facing the longitudinal reinforcement of the tunnel invert, and align the reserved extended reinforcement of the T-shaped sealing plug 7 with the longitudinal reinforcement of the tunnel invert through the through-hole 73 one by one. Then, translate the assembled cast-in-place tunnel invert formwork towards the longitudinal reinforcement of the tunnel invert until the length of the longitudinal reinforcement of the tunnel invert passing through the cast-in-place tunnel invert formwork reaches the required reserved length. Next, use the reserved extended reinforcement through-hole seal 8 to plug the reserved extended reinforcement through-hole 73 of the T-shaped sealing plug 7 without reinforcement passing through, and perform secondary sealing on the through-hole 73 of the reserved extended reinforcement through-hole where the reinforcement is inserted. If the screw 56 is loosened, the diagonal strut 54 can be knocked down to adjust the inclination angle. After the screw 56 is tightened, the diagonal strut 54 can be fixed on the "L"-shaped steel plate 55 to form a stable angle on the ground. Finally, insert steel bars or wooden bars into the "L"-shaped steel plates 55 of the connecting skeletons 5 of multiple tunnel invert formworks to keep them stable. At this time, the invert reinforcement has successfully penetrated the formwork, leaving enough length for lapping with the next version of the invert reinforcement to form an overall stress-bearing structure.

Claims

1. A combined inverted arch concrete casting formwork for reserved extended reinforcing bars to pass through, characterized in that, The concrete pouring formwork includes a tunnel invert formwork connection skeleton, a tunnel invert formwork insertion plate, a T-shaped sealing insertion plate, and a sealing plug for the reserved extended reinforcement through-hole; The tunnel invert formwork insertion plate is inserted between the tunnel invert formwork connection skeletons; the tunnel invert formwork insertion plate is provided with a reserved sealing plate slot; the T-shaped sealing insertion plate is inserted into the reserved sealing plate slot, and the sealing plug for the reserved extended reinforcement through-hole is inserted into the reserved extended reinforcement through-hole of the T-shaped sealing insertion plate.

2. The combined inverted arch concrete casting formwork for reserved passing of extended reinforcing bars according to claim 1, wherein, The tunnel invert formwork connection skeleton is composed of an intermediate connection skeleton and an end connection skeleton, and fixed invert formwork insertion plate clamping grooves are arranged on one side of the end connection skeleton and both sides of the intermediate connection skeleton.

3. The combined inverted arch concrete casting formwork for reserved extended reinforcing bars to pass through according to claim 1, characterized in that The tunnel invert formwork connection skeleton is fixedly connected with an "L"-shaped steel plate, and the "L"-shaped steel plate is connected with a brace rod through a fixed inclined support screw.

4. The combined inverted arch concrete casting formwork for reserved extended steel bars to pass through according to claim 1, characterized in that, The area of the opening on the side of the reserved sealing plate slot facing the pouring surface is larger than that on the other side, and the shape of the opening is "convex", and the opening of the reserved sealing plate slot is rectangular.

5. The combined inverted arch concrete casting formwork for reserved extension steel bars to pass through according to claim 1, characterized in that, The T-shaped sealing insertion plate includes a rectangular insertion plate and a rectangular clamping plate; the surface area of the rectangular clamping plate is larger than that of the rectangular insertion plate.

6. The combined inverted arch concrete casting formwork for reserved through-elongated steel bars according to claim 1, characterized in that, The area of the opening on the side of the reserved extended reinforcement through-hole facing the pouring surface is larger than that on the other side, and the shape of the opening is "convex", and the opening of the reserved extended reinforcement through-hole is circular.

7. A combined inverted arch concrete casting formwork for reserved extension steel bars to pass through according to claim 1, characterized in that, The sealing plug for the reserved extended reinforcement through-hole is provided with a plug and a fixed clamping plate, and the cross-sectional area of the fixed clamping plate is larger than that of the plug; the shape of the sealing plug for the reserved extended reinforcement through-hole is "convex", and both sides of the sealing plug for the reserved extended reinforcement through-hole are circular.

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