Inter-pile cast-in-place retaining wall single-side formwork and construction method

Abstract

According to the inter-pile cast-in-place retaining wall single-side formwork and the construction method, the arc-shaped load-bearing steel bars and the pile foundation main bars are reliably welded, the whole arc-shaped load-bearing steel bars are located in the inter-pile wall body, and the water stop screws used by the single-side formwork and the arc-shaped steel bars are firmly welded; according to the first reinforcement outside the single-side formwork, one screw is provided with two vertical steel pipes for vertical reinforcement, transverse steel pipes are additionally arranged on the outermost side for horizontal reinforcement so as to guarantee the integrity of the single-side formwork, the applicability to installation and reinforcement of the single-side formwork of the retaining wall between the piles is high, the construction period is greatly shortened, and the cost reduction effect is remarkable.

Description

Technical Field

[0001] The present application relates to the technical field of municipal road construction, and in particular to a single-sided formwork for a cast-in-place retaining wall between piles and a construction method thereof. Background Art

[0002] Generally, large excavation sections adopt the pile foundation retaining wall support mode. A retaining wall of a certain thickness is set between the piles. The horizontal steel bars of the wall are welded with the embedded bars pre-set on the pile foundation to form a whole. The soil is used as the natural formwork of the retaining wall on the soil side, and the wooden formwork needs to be installed on the soil side to shape it.

[0003] Compared with the traditional construction technology of double-sided formwork reinforcement of the wall, the installation and reinforcement of the single-sided formwork of the pile retaining wall requires higher technical requirements and is more difficult. A construction method for efficient installation and reinforcement of the single-sided formwork of the pile-to-pile cast-in-place retaining wall is suitable for wide pile retaining walls, which are mainly subjected to the stress generated by concrete pouring. If a safe and effective construction technology is not adopted, the construction task cannot be successfully completed.

[0004] Chinese patent CN204875849U discloses a single-sided formwork reinforcement structure of a pile-plate combined retaining plate, and proposes a casting space for a retaining wall surrounded by a pre-buried tension screw on the pile foundation steel cage and the formwork outside the pile foundation, and the tension bolts and fasteners extending horizontally outward from the outside of the formwork and the multi-layer keels arranged on the inner side of the formwork are fixed on the outer surface of the formwork to form a tension template fixing structure. However, it is limited to the construction method when there is a certain space between the outermost side of the wall and the pile foundation, and does not solve the problem of efficient installation and reinforcement of the single-sided formwork of the retaining wall between the pile foundations. Chinese patent CN107675699A discloses an assembled water-stop screw reinforcement single-sided formwork structure and construction method, which uses the vertical force-bearing steel bars of the steel cage to embed the tie rods, and the tie rods extending out of the support structure surface should be vertical, and the water-stop screws are fixed on the formwork, and the water-stop screws are connected to the pre-buried tie rods through the connecting sleeve to achieve the purpose of reinforcing the formwork. It does not solve the problem of efficient installation and reinforcement of the single-sided formwork of the retaining wall between the pile foundations. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a single-sided formwork and construction method for a cast-in-place retaining wall between piles in view of the above-mentioned problems. The arc-shaped steel bars are arranged in the wall and form a whole with the retaining wall after the concrete is formed, so as to avoid the main steel bars from leaking out of the wall surface.

[0006] The embodiment of the present application is implemented as follows:

[0007] The embodiment of the present application provides a single-sided formwork for a cast-in-place retaining wall between piles, characterized in that it includes a wall between piles, a single-sided formwork and stressed steel bars, the wall between piles including wall steel bars, the wall steel bars are respectively tied and fastened to the heads of horizontal steel bars of the pre-embedded retaining wall of the pile foundation on both sides, the stressed steel bars are arc-shaped structures, located inside the wall between piles, and the two end heads are respectively welded and fastened to the main bars of the pile foundation on both sides, the single-sided formwork is made by splicing a plurality of cast-in-place formworks in sequence from bottom to top, a plurality of waterstop screws are welded to the stressed steel bars at intervals, and the ends of the waterstop screws are connected to the single-sided formwork through fastening devices.

[0008] In some optional embodiments, the fastening device includes a vertical fastening mechanism and a transverse fastening mechanism, and the vertical fastening mechanism and the transverse fastening mechanism both correspond to the end clamping arrangement of the water-stop screw exposed on the single-side template.

[0009] In some optional implementation schemes, the stress-bearing steel bars are arranged at intervals along the height direction of the inter-pile wall, one piece of the cast-in-place formwork corresponds to one stress-bearing steel bar, and the stress-bearing steel bar is located at a middle height level position of the cast-in-place formwork.

[0010] In some optional embodiments, the vertical fastening mechanism includes two vertical steel pipes in a group, which are respectively located on both sides of the end of the corresponding water-stop screw, and vertical clamping and fastening are formed by vertical butterfly fasteners and vertical hexagonal nuts.

[0011] In some optional embodiments, the transverse fastening mechanism includes a group of two transverse steel pipes, which are tightly attached to the vertical steel pipe. The two transverse steel pipes are respectively located on both sides of the end of the corresponding water-stop screw, and a transverse clamping fastening is formed by a transverse butterfly fastener and a transverse hexagonal nut.

[0012] In some optional implementation schemes, two adjacent stress-bearing steel bars in the height direction of the inter-pile wall are respectively connected by welding to two adjacent pile foundation column steel bars.

[0013] In some optional embodiments, a pile foundation waterstop screw is welded on both sides of the stressed steel bars, the pile foundation waterstop screw is welded to the pile foundation main reinforcement, and the end of the pile foundation waterstop screw is connected to the single-sided formwork through the fastening device.

[0014] A construction method for a single-side formwork of a cast-in-place retaining wall between piles, characterized in that it comprises the following steps:

[0015] Step 1: First, the verticality of the wall between the piles is measured and the lines are drawn to ensure that the wall between the piles is neatly formed and beautiful;

[0016] Step 2, tying the wall reinforcement between the piles;

[0017] Step 3, welding arc-shaped stress-bearing steel bars, welding a stress-bearing steel bar at 1 / 2 the height of each cast-in-place formwork along the height of the wall between the piles. To avoid stress concentration on the main reinforcement of the pile foundation, the arc-shaped reinforcement bars of two adjacent cast-in-place formworks are welded to the main reinforcement of the adjacent pile foundation;

[0018] Step 4: Weld water-stop screws on the curved steel bars. According to the width and thickness of the wall, weld the number of water-stop screws that meet the safety and stability requirements of the formwork. Weld one pile foundation water-stop screw at each end close to the pile foundation. The length of the water-stop screws must reserve enough space for the installation of the fastening device.

[0019] Step 5: Install the cast-in-place formwork. During installation, the joints should be tightly connected to ensure that there is no leakage.

[0020] Step 6, reinforce the vertical steel pipe, and use vertical butterfly fasteners and vertical hexagonal nuts to form vertical clamping and fastening;

[0021] Step 7, reinforce the transverse steel pipe, and use transverse butterfly fasteners and transverse hexagonal nuts to form transverse clamping and fastening;

[0022] Step 8, pouring concrete;

[0023] Step 9, demoulding and curing. Demolding follows the principle of installing first and then demoulding, or installing last and then demoulding first;

[0024] Step 10, cut off the water stop screws, apply the preservative, and plaster the wall; repeat the above steps to construct section by section and block by block.

[0025] The beneficial effects of the present application are as follows: the present application provides a single-sided formwork and construction method for a cast-in-place retaining wall between piles. Compared with the traditional welding reinforcement method, the arc-shaped steel bar structure is more stable, which effectively reduces the risk of formwork explosion due to stress concentration during concrete pouring, ensures construction safety and quality, and can also be reused by making arc-shaped steel bars from scrap steel bars, further realizing the green cycle of building materials; the water-stop screw is used in combination with butterfly buckles and hexagonal nuts, and the installation and removal operations are efficient, and the formwork can be effectively fixed at one time; it can support the pouring of walls up to 3-5 meters in height at one time, greatly reducing the number of pouring times and the corresponding construction joint retention, which not only reduces the waste of concrete pumping machinery, but also significantly improves the visual quality of the wall; the arc-shaped steel bars are set in the wall, and after the concrete is formed, the two are tightly combined to form a whole, effectively avoiding the common wall quality problems caused by the exposure of the main steel bars, and improving the overall aesthetics and durability of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A top view of the construction of a single-side formwork for a cast-in-place retaining wall between piles according to an embodiment of the present application;

[0028] Figure 2 for Figure 1 AA view. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0037] like Figure 1-Figure 2 As shown, the present invention provides a single-sided formwork for a cast-in-place retaining wall between piles, comprising a wall body 1 between piles, a single-sided formwork 2 and stressed steel bars 3, the wall body between piles comprising wall steel bars 4, the wall steel bars are respectively tied and fastened to the horizontal steel bar heads of the pre-embedded retaining wall of the pile foundation 5 located on both sides, the stressed steel bars are arc-shaped structures, located inside the wall body between piles, and the two end heads are respectively welded and fastened to the main bars 6 of the pile foundation located on both sides, the single-sided formwork is made by splicing a plurality of cast-in-place formworks in sequence from bottom to top, a plurality of water-stop screws 7 are welded to the stressed steel bars at intervals, and the ends of the water-stop screws are connected to the single-sided formwork through fastening devices.

[0038] The fastening device comprises a vertical fastening mechanism and a transverse fastening mechanism, and both the vertical fastening mechanism and the transverse fastening mechanism are clamped corresponding to the end of the water-stop screw exposed on the single-side template.

[0039] The stress-bearing steel bars are arranged at intervals along the height direction of the wall between the piles. One stress-bearing steel bar corresponds to one cast-in-place formwork, and the stress-bearing steel bar is located at the middle height level of the cast-in-place formwork. Two adjacent stress-bearing steel bars in the height direction of the wall between the piles are welded to the two adjacent pile foundation column steel bars to avoid the concentration of stress on the main reinforcement of the pile foundation.

[0040] The vertical fastening mechanism includes two vertical steel pipes 8 in a group, which are respectively located on both sides of the end of the corresponding water-stop screw, and vertical clamping and fastening are formed by vertical butterfly fasteners 9 and vertical hexagonal nuts 10.

[0041] The transverse fastening mechanism includes two transverse steel pipes 11 in a group, which are closely attached to the vertical steel pipe. The two transverse steel pipes are respectively located on both sides of the ends of the corresponding water-stop screws, and transverse clamping and fastening are formed by transverse butterfly fasteners 12 and transverse hexagonal nuts 13.

[0042] The number of waterstop screws welded according to the wall width and thickness that meet the safety and stability requirements of the formwork is ≤3 on the arc-shaped stress-bearing steel bars of a wall with a width of 3.0m and a thickness of 0.8m. A pile foundation waterstop screw 14 is welded on each end close to the pile foundation. The pile foundation waterstop screw is welded to the main reinforcement of the pile foundation, and the end of the pile foundation waterstop screw is connected to the single-sided formwork through a fastening device.

[0043] The hole diameter and hole spacing of the water-stop screws are unified to achieve standardized production of the template, so that each template can be reused in multiple constructions. When removing the template, only simple protection is required, which can significantly improve the turnover rate of the template. It has been verified in practice that the turnover rate can reach more than 10 times, which significantly reduces the construction cost.

[0044] The specific construction plan is as follows:

[0045] In order to more conveniently and quickly install and reinforce the single-sided formwork of the wall between piles, it is necessary to chisel out the horizontal steel bar heads of the pile foundation embedded retaining wall in the early stage, further straighten and remove rust, and then tie the wall steel bars. After the above preparatory work is completed, the formwork system construction can be carried out.

[0046] The verticality of the wall between piles is marked and marked to ensure that the wall between piles is neat and beautiful, the arc-shaped stress-bearing steel bars are firmly welded to the main bars of the pile foundation, the water-stop screws are welded to the arc-shaped stress-bearing steel bars, and the water-stop screws have a reinforcement length of the fastening device.

[0047] Because the wall between piles is constructed in sections and blocks, the single-sided formwork installation and reinforcement construction method of the wall between piles can ensure a pouring height of 3-5 meters at one time. Compared with other formwork installation methods, this formwork installation and reinforcement method is faster to construct, the wall formwork has better integrity, and the visual quality after forming is better.

[0048] Example 1

[0049] A construction method for a single-side formwork of a cast-in-place retaining wall between piles comprises the following steps:

[0050] Step 1: First, the verticality of the wall between the piles is measured and the lines are marked to ensure that the wall between the piles is neatly formed and beautiful.

[0051] Step 2: Tie the wall reinforcement between piles.

[0052] Step 3, weld arc-shaped stress-bearing steel bars. Weld a stress-bearing steel bar at 1 / 2 the height of each cast-in-place formwork along the height of the wall between piles. To avoid stress concentration on the main reinforcement of the pile foundation, the arc-shaped reinforcements of two adjacent cast-in-place formworks are welded to the main reinforcement of the adjacent pile foundations.

[0053] Step 4, weld waterstop screws on the arc-shaped steel bars. According to the width and thickness of the wall, weld a number of waterstop screws that meet the safety and stability requirements of the formwork. Weld a pile foundation waterstop screw at each end close to the pile foundation. The length of the waterstop screws must reserve enough space for the installation of the fastening device.

[0054] Step 5: Install the cast-in-place formwork. Make sure the joints are tight during installation to prevent leakage.

[0055] Step 6: Reinforce the vertical steel pipe by using vertical butterfly fasteners and vertical hexagonal nuts to form vertical clamping and fastening.

[0056] Step 7, reinforce the transverse steel pipe and use transverse butterfly fasteners and transverse hexagonal nuts to form a transverse clamping fastener.

[0057] Step 8: Pour concrete.

[0058] Step 9, demolding and curing. Demolding should follow the principle of installing first and then dismantling, or installing last and then dismantling.

[0059] Step 10, cut off the water stop screws, apply the preservative, and plaster the wall; repeat the above steps to construct section by section and block by block.

Claims

1. A single-sided formwork for a cast-in-place retaining wall between piles, characterized in that: It includes a wall between piles, a single-sided formwork and stressed steel bars. The wall between piles includes wall steel bars. The wall steel bars are respectively tied and fastened to the horizontal steel bar heads of the pile foundation embedded retaining wall on both sides. The stressed steel bars are arc-shaped structures and are located inside the wall between piles. The two end heads are respectively welded and fastened to the main bars of the pile foundation on both sides. The single-sided formwork is made of multiple cast-in-place formworks spliced ​​in sequence from bottom to top. Multiple waterstop screws are welded on the stressed steel bars at intervals, and the ends of the waterstop screws are connected to the single-sided formwork through fastening devices.

2. The single-sided formwork for cast-in-place retaining wall between piles according to claim 1, characterized in that: The fastening device comprises a vertical fastening mechanism and a transverse fastening mechanism, and both the vertical fastening mechanism and the transverse fastening mechanism are clamped corresponding to the end of the water-stop screw exposed on the single-side template.

3. The single-sided formwork for the cast-in-place retaining wall between piles according to claim 2 is characterized in that: The stress-bearing steel bars are arranged at intervals along the height direction of the inter-pile wall, one cast-in-place formwork corresponds to one stress-bearing steel bar, and the stress-bearing steel bar is located at a middle height level position of the cast-in-place formwork.

4. A single-sided formwork for a cast-in-place retaining wall between piles according to claim 2 or 3, characterized in that: The vertical fastening mechanism includes two vertical steel pipes in a group, which are respectively located on both sides of the end of the corresponding water-stop screw, and vertical clamping and fastening are formed by vertical butterfly fasteners and vertical hexagonal nuts.

5. The single-sided formwork for cast-in-place retaining wall between piles according to claim 4, characterized in that: The transverse fastening mechanism includes two transverse steel pipes in a group, which are closely attached to the vertical steel pipe. The two transverse steel pipes are respectively located on both sides of the ends of the corresponding water-stop screws, and transverse clamping and fastening are formed by transverse butterfly fasteners and transverse hexagonal nuts.

6. The single-sided formwork for cast-in-place retaining wall between piles according to claim 3, characterized in that: Two adjacent stress-bearing steel bars in the height direction of the inter-pile wall are respectively connected by welding to two adjacent pile foundation column steel bars.

7. The single-sided formwork for cast-in-place retaining wall between piles according to claim 6, characterized in that: A pile foundation water-stopping screw is welded to both sides of the stressed steel bars respectively, the pile foundation water-stopping screw is welded to the pile foundation main bars, and the end of the pile foundation water-stopping screw is connected to the single-side formwork through the fastening device.

8. The construction method of a single-side formwork for a cast-in-place retaining wall between piles according to claim 6 is characterized in that: The steps include: Step 1: First, the verticality of the wall between the piles is measured and the lines are drawn to ensure that the wall between the piles is neatly formed and beautiful; Step 2, tying the wall reinforcement between the piles; Step 3, welding arc-shaped stress-bearing steel bars, welding a stress-bearing steel bar at 1 / 2 the height of each cast-in-place formwork along the height of the wall between the piles. To avoid stress concentration on the main reinforcement of the pile foundation, the arc-shaped reinforcement bars of two adjacent cast-in-place formworks are welded to the main reinforcement of the adjacent pile foundation; Step 4: Weld water-stop screws on the curved steel bars. According to the width and thickness of the wall, weld the number of water-stop screws that meet the safety and stability requirements of the formwork. Weld one pile foundation water-stop screw at each end close to the pile foundation. The length of the water-stop screws must reserve enough space for the installation of the fastening device. Step 5: Install the cast-in-place formwork. During installation, the joints should be tightly connected to ensure that there is no leakage. Step 6, reinforce the vertical steel pipe, and use vertical butterfly fasteners and vertical hexagonal nuts to form vertical clamping and fastening; Step 7, reinforce the transverse steel pipe, and use transverse butterfly fasteners and transverse hexagonal nuts to form transverse clamping and fastening; Step 8, pouring concrete; Step 9, demoulding and curing. Demolding follows the principle of installing first and then demoulding, or installing last and then demoulding first; Step 10, cut off the water stop screws, apply the preservative, and plaster the wall; repeat the above steps to construct section by section and block by block.

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