Single-side formwork for cast-in-situ soil retaining wall between piles and construction method

Abstract

The present application provides a kind of pile between cast-in-place retaining wall single-sided formwork and construction method, arc stress reinforcement is reliably welded with pile foundation main reinforcement, whole arc stress reinforcement is in the interior of pile between wall body, water stop screw used in single-sided formwork is firmly welded with arc reinforcement, the first reinforcing of single-sided formwork outside adopts one screw configuration two vertical steel pipes vertical reinforcement, most outside is provided with horizontal steel pipe horizontal reinforcement to ensure the integrity of single-sided formwork, the present application is suitable for the installation and reinforcement of pile between retaining wall single-sided formwork, construction cycle is greatly shortened, and cost reduction effect is remarkable.

Description

Technical Field

[0001] This application relates to the technical field of municipal road construction, and more specifically, to a single-sided formwork and construction method for a cast-in-place retaining wall between piles. Background Technology

[0002] In general, large-scale excavation sections of roads adopt a pile foundation retaining wall support mode. A retaining wall of a certain thickness is set between the piles, and the horizontal reinforcement of the wall is welded to the pre-embedded reinforcement in the pile foundation to form a whole. On the soil-facing side, the soil itself serves as the natural formwork for the retaining wall, while on the soil-repelling side, wooden formwork needs to be installed for shaping.

[0003] Compared to the traditional construction process of double-sided formwork reinforcement for walls, the installation and reinforcement of single-sided formwork for pile retaining walls is more technically demanding and challenging. A method for the efficient installation and reinforcement of single-sided formwork for cast-in-place pile retaining walls is applicable to wide pile retaining walls, where the main force is the stress generated during concrete pouring. Without a safe and effective construction process, this task cannot be successfully completed.

[0004] Chinese patent CN204875849U discloses a single-sided formwork reinforcement structure for a pile-slab combined retaining wall. It proposes a casting space for the retaining wall formed by pre-embedded tie rods on the pile foundation reinforcement cage and the formwork on the outer side of the pile foundation. Tie rods extending horizontally outward from the outer side of the formwork, along with fasteners and multi-layered joists interlocking on the inner side, are fixed to the outer surface of the formwork, forming a tie-type formwork fixing structure. However, this method is limited to construction when there is a certain space between the outermost part of the wall and the pile foundation, and does not solve the problem of efficient installation and reinforcement of single-sided formwork for the retaining wall between pile foundations. Chinese patent CN107675699A discloses a prefabricated water-stop tie rod reinforcement structure and construction method for single-sided formwork. It utilizes pre-embedded tie rods in the vertical reinforcing bars of the reinforcement cage. The tie rods extending from the support structure surface should be vertical. Water-stop tie rods are fixed on the formwork, and the water-stop tie rods are connected to the pre-embedded tie rods through connecting sleeves to achieve the purpose of reinforcing the formwork. However, this method also does not solve the problem of efficient installation and reinforcement of single-sided formwork for the retaining wall between 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 order to address the above-mentioned problems. The curved steel bars are set in the wall and form an integral whole with the retaining wall after the concrete is formed, thus avoiding the main steel bars from being exposed on the wall surface.

[0006] The embodiments of this application are implemented as follows:

[0007] This application provides a single-sided formwork for a cast-in-place retaining wall between piles, characterized in that it includes a pile wall, a single-sided formwork, and reinforcing steel bars. The pile wall includes wall reinforcement bars, which are respectively tied and fastened to the horizontal reinforcing steel bars of the pre-embedded retaining wall on both sides of the pile foundation. The reinforcing steel bars are arc-shaped structures located inside the pile wall, and their two ends are respectively welded and fastened to the main reinforcing bars of the pile foundation on both sides. The single-sided formwork is made by splicing multiple cast-in-place formwork pieces from bottom to top. Multiple water-stop bolts are welded at intervals on the reinforcing steel bars, and the ends of the water-stop bolts are connected to the single-sided formwork through fastening devices.

[0008] In some alternative implementations, the fastening device includes a vertical fastening mechanism and a horizontal fastening mechanism, both of which correspond to the end clamping arrangement of the water-stop screw exposed on one side of the template.

[0009] In some alternative implementations, the reinforcing bars are spaced apart along the height direction of the pile wall, with one piece of cast-in-place formwork corresponding to one reinforcing bar, and the reinforcing bars are located at the middle horizontal position of the cast-in-place formwork.

[0010] In some alternative implementations, the vertical fastening mechanism includes two vertical steel pipes as a set, located on both sides of the end of the corresponding water-stop screw, forming a vertical clamping fastening through a vertical butterfly fastener and a vertical hexagonal nut.

[0011] In some alternative implementations, the lateral fastening mechanism includes two lateral steel pipes as a group, which are closely attached to the vertical steel pipe. The two lateral steel pipes are located on both sides of the end of the corresponding water-stop screw, and are laterally clamped and fastened by lateral butterfly fasteners and lateral hexagonal nuts.

[0012] In some alternative implementations, two adjacent reinforcing bars in the height direction of the pile wall are welded to two adjacent reinforcing bars of the pile foundation column.

[0013] In some alternative implementations, a pile foundation water-stop screw is welded to each side of the stressed reinforcing bar, the pile foundation water-stop screw is welded to the main reinforcing bar of the pile foundation, and the end of the pile foundation water-stop screw is connected to the single-sided template through the fastening device.

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

[0015] Step 1: First, lay out and mark the verticality of the wall between piles to ensure that the wall between piles is neat and aesthetically pleasing.

[0016] Step 2: Tie the reinforcing steel bars in the wall between piles;

[0017] Step 3: Weld the arc-shaped reinforcing bars. Weld one reinforcing bar at half 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 reinforcing 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 bolts onto the curved steel bars. Weld the required number of water-stop bolts to meet the safety and stability requirements of the formwork, based on the width and thickness of the wall. Weld one pile foundation water-stop bolt at each end near the pile foundation. The length of the water-stop bolts must be sufficient to allow for the installation of fastening devices.

[0019] Step 5: Install the cast-in-place formwork, ensuring tight joints during installation to prevent grout leakage;

[0020] Step 6: Reinforce the vertical steel pipe by using vertical butterfly fasteners and vertical hexagonal nuts to form a vertical clamping and fastening mechanism;

[0021] Step 7: Reinforce the horizontal steel pipe by using horizontal butterfly fasteners and horizontal hexagonal nuts to form a horizontal clamping and fastening.

[0022] Step 8: Pour concrete;

[0023] Step 9: Demolding and curing. Demolding should follow the principle of "installing first, then removing" and "installing last, then removing first".

[0024] Step 10: Cut off the water-stop bolts, apply anti-corrosion agent, and plaster the wall; repeat the above steps to construct section by section and block by block.

[0025] The beneficial effects of this application are as follows: The single-sided formwork and construction method for cast-in-place retaining walls between piles provided by this application are more stable than traditional welding reinforcement methods. The curved steel structure effectively reduces the risk of formwork bursting due to stress concentration during concrete pouring, ensuring construction safety and quality. Furthermore, the curved steel bars can be reused by using scrap steel bars to make curved steel bars, further realizing the green recycling of building materials. The water-stop bolts are used in combination with butterfly buckles and hexagonal nuts, making installation and removal operations efficient, and the formwork can be effectively fixed in one go. It can support the pouring of walls up to 3-5 meters high in one go, greatly reducing the number of pouring times and the corresponding construction joints. This not only reduces the waste of concrete pumping machinery shifts but also significantly improves the appearance quality of the wall. By setting the curved steel bars inside the wall, after the concrete is formed, the two are tightly integrated to form a whole, effectively avoiding the common wall quality problems caused by exposed main steel bars, and improving the overall aesthetics and durability of the building. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a top view of the construction of a single-sided formwork for a cast-in-place retaining wall between piles, according to an embodiment of this application.

[0028] Figure 2 for Figure 1 AA view. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

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

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "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 expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0037] like Figures 1-2 As shown, the present invention provides a single-sided formwork for a cast-in-place retaining wall between piles, including a pile wall 1, a single-sided formwork 2, and reinforcing steel bars 3. The pile wall includes wall reinforcing bars 4, which are tied and fastened to the horizontal reinforcing bars of the retaining wall pre-embedded in the pile foundation 5 on both sides. The reinforcing steel bars have an arc-shaped structure and are located inside the pile wall. Both ends are welded and fastened to the main reinforcing bars 6 of the pile foundation on both sides. The single-sided formwork is made by splicing multiple cast-in-place formwork pieces from bottom to top. Multiple water-stop bolts 7 are welded at intervals on the reinforcing steel bars. The ends of the water-stop bolts are connected to the single-sided formwork through fastening devices.

[0038] The fastening device includes a vertical fastening mechanism and a horizontal fastening mechanism, both of which correspond to the clamping setting of the exposed end of the water-stop screw on one side of the template.

[0039] The reinforcing bars are spaced apart along the height of the pile wall, with one reinforcing bar corresponding to each cast-in-place formwork. The reinforcing bars are located at the middle horizontal position of the cast-in-place formwork. Adjacent reinforcing bars in the height direction of the pile wall are welded to the reinforcing bars of the two adjacent pile columns to avoid stress concentration in the main reinforcement of the pile foundation.

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

[0041] The transverse fastening mechanism includes two transverse steel pipes 11 as a group, which are closely attached to the vertical steel pipe. The two transverse steel pipes are located on both sides of the end of the corresponding water-stop screw, and are clamped and fastened by transverse butterfly fasteners 12 and transverse hexagonal nuts 13.

[0042] The number of water-stop tie rods welded to meet the safety and stability requirements of the template should be determined according to the width and thickness of the wall. For a wall with a width of 3.0m and a thickness of 0.8m, the number of water-stop tie rods welded on the curved reinforcing steel bars should be ≤3. One pile foundation water-stop tie rod 14 should be welded to each end near the pile foundation. The pile foundation water-stop tie rod should be welded to the main reinforcing steel bars of the pile foundation. The end of the pile foundation water-stop tie rod should be connected to the template on one side through a fastening device.

[0043] Standardizing the hole diameter and spacing of the water-stop bolts enables standardized formwork manufacturing, allowing each formwork to be reused in multiple construction projects. Simple protection is required during formwork removal, significantly improving the formwork's turnover rate. Practical experience has shown that the turnover rate can reach more than 10 times, significantly reducing construction costs.

[0044] The specific construction plan is as follows:

[0045] To facilitate the installation and reinforcement of the single-sided formwork for the pile-to-pillar wall, the horizontal steel bars embedded in the pile foundation must be chiseled out, straightened, and rust-removed before the wall steel bars are tied. Once these preparations are completed, the formwork system can be constructed.

[0046] The verticality of the wall between piles is laid out and marked to ensure that the wall between piles is neat and beautiful. The arc-shaped reinforcing steel bars are firmly welded to the main reinforcing bars of the pile foundation. The water-stop screws are welded to the arc-shaped reinforcing steel bars, and the water-stop screws are reinforced with fastening devices.

[0047] Because the pile wall is constructed in sections and blocks, the single-sided formwork installation and reinforcement method of the pile wall can ensure a pouring height of 3-5 meters in one go. Compared with other formwork installation methods, this formwork installation and reinforcement method is faster, has better overall integrity of the wall formwork, and has better appearance quality after completion.

[0048] Example 1

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

[0050] Step 1: First, lay out and mark the verticality of the wall between piles to ensure that the wall between piles is neat and aesthetically pleasing.

[0051] Step 2: Tie the reinforcing bars of the wall between piles.

[0052] Step 3: Weld the arc-shaped reinforcing bars. Weld one reinforcing bar at half 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 reinforcing bars of two adjacent cast-in-place formworks are welded to the main reinforcement of the adjacent pile foundation.

[0053] Step 4: Weld water-stop bolts onto the curved steel bars. Weld the required number of water-stop bolts to meet the safety and stability requirements of the formwork, based on the width and thickness of the wall. Weld one pile foundation water-stop bolt at each end near the pile foundation. The length of the water-stop bolts must allow sufficient space for the installation of fastening devices.

[0054] Step 5: Install the cast-in-place formwork. During installation, ensure that the joints are tightly connected to prevent grout leakage.

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

[0056] Step 7: Reinforce the horizontal steel pipe by using horizontal butterfly fasteners and horizontal hexagonal nuts to form a horizontal clamping and fastening.

[0057] Step 8: Pour concrete.

[0058] Step 9: Demolding and curing. Demolding should follow the principle of "installing first, then removing" and "installing last, then removing first".

[0059] Step 10: Cut off the water-stop bolts, apply anti-corrosion agent, 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, The system includes a pile-interlocking wall, a single-sided formwork, and reinforcing steel bars. The pile-interlocking wall includes wall reinforcement bars, which are tied and secured to the horizontal reinforcing steel bars of the pre-embedded retaining wall on both sides of the pile foundation. The reinforcing steel bars are arc-shaped structures located inside the pile-interlocking wall, with both ends welded and secured to the main reinforcing bars of the pile foundation on both sides. The single-sided formwork is constructed by sequentially splicing multiple cast-in-place formwork panels from bottom to top. Multiple water-stop bolts are welded at intervals on the reinforcing steel bars, and the ends of the water-stop bolts are connected to the single-sided formwork panels via fastening devices. The reinforcing steel bars are spaced apart along the height direction of the pile-interlocking wall, with one reinforcing steel bar corresponding to one cast-in-place formwork panel, and the reinforcing steel bars are located at the middle horizontal position of the cast-in-place formwork panels. Two adjacent reinforcing steel bars in the height direction of the pile-interlocking wall are welded to two adjacent main reinforcing bars of the pile foundation. A water-stop bolt is welded to each side of the reinforcing steel bar, and the water-stop bolt is welded to the main reinforcing bar of the pile foundation. The ends of the water-stop bolts are connected to the single-sided formwork panels via fastening devices.

2. A single-sided formwork for a cast-in-place retaining wall between piles according to claim 1, characterized in that, The fastening device includes a vertical fastening mechanism and a horizontal fastening mechanism, both of which are configured to clamp the exposed ends of the water-stop screw on one side of the template.

3. A single-sided formwork for a cast-in-place retaining wall between piles according to claim 2, characterized in that, The vertical fastening mechanism consists of two vertical steel pipes as a set, located on both sides of the end of the corresponding water-stop screw, and is vertically clamped and fastened by vertical butterfly fasteners and vertical hexagonal nuts.

4. A single-sided formwork for a cast-in-place retaining wall between piles according to claim 3, characterized in that, The horizontal fastening mechanism includes two horizontal steel pipes as a group, which are closely attached to the vertical steel pipe. The two horizontal steel pipes are located on both sides of the end of the corresponding water-stop screw, and are clamped and fastened horizontally by horizontal butterfly fasteners and horizontal hexagonal nuts.

5. A construction method for a single-sided formwork of a cast-in-place retaining wall between piles as described in claim 4, characterized in that, Includes the following steps: Step 1: First, lay out and mark the verticality of the wall between piles to ensure that the wall between piles is neat and aesthetically pleasing. Step 2: Tie the reinforcing steel bars in the wall between piles; Step 3: Weld the arc-shaped reinforcing bars. Weld one reinforcing bar along half 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 reinforcing bars of two adjacent cast-in-place formworks are welded to the main reinforcement of the adjacent pile foundation. Step 4: Weld water-stop bolts onto the curved steel bars. Weld the required number of water-stop bolts to meet the safety and stability requirements of the formwork, based on the width and thickness of the wall. Weld one pile foundation water-stop bolt at each end near the pile foundation. The length of the water-stop bolts must be sufficient to allow for the installation of fastening devices. Step 5: Install the cast-in-place formwork, ensuring tight joints during installation to prevent grout leakage; Step 6: Reinforce the vertical steel pipe by using vertical butterfly fasteners and vertical hexagonal nuts to form a vertical clamping and fastening mechanism; Step 7: Reinforce the horizontal steel pipe by using horizontal butterfly fasteners and horizontal hexagonal nuts to form a horizontal clamping and fastening. Step 8: Pour concrete; Step 9: Demolding and curing. Demolding should follow the principle of "installing first, then removing" and "installing last, then removing first". Step 10: Cut off the water-stop bolts, apply anti-corrosion agent, and plaster the wall; repeat the above steps to construct section by section and block by block.

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