Single-side formwork system for sheet-pile retaining wall and construction method thereof

Abstract

This invention discloses a single-sided formwork system and construction method for pile-slab retaining walls, comprising a plurality of anti-slide piles set at predetermined positions on the slope, a retaining wall formwork set between adjacent anti-slide piles, and a formwork structure set on the free side of the retaining wall formwork. The formwork structure is used to transfer the force of the retaining wall formwork to the anti-slide piles. The formwork structure includes a support component set on the free side of the retaining wall formwork and an adjustment component set between the support component and the retaining wall formwork. The adjustment component is used to adjust the horizontality and verticality of the retaining wall formwork and to transfer the force of the retaining wall formwork to the support component. After the support component is connected to the anti-slide piles, it receives the force from the adjustment component and transfers it to the anti-slide piles. This invention is not limited by site conditions, does not require a separate formwork support frame, and is not affected by the relative planar position relationship between the retaining wall and the anti-slide piles.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a unilateral formwork system for pile-slab retaining wall and a construction method. BACKGROUND

[0002] In slope support engineering, pile-slab retaining wall is one of the commonly used support types. The support structure includes anti-slide piles and retaining walls between piles. The existing construction method of pile-slab retaining wall is to first mechanically form a hole to construct anti-slide piles, and then excavate the earthwork to vertically segmentally construct the retaining wall between the piles when the concrete strength of the anti-slide piles reaches the design requirement.

[0003] Because the retaining wall will have lateral pressure when pouring concrete to form the retaining wall, unilateral formwork will be performed on the free side of the retaining wall during construction to resist the lateral pressure when pouring concrete for the retaining wall. When there is enough soil on the free side, it is usually excavated into a trench shape. The formwork of the retaining wall is usually supported by inclined struts for unilateral formwork. However, the height limitation of segmental pouring of the retaining wall makes the support force transmission path of the inclined strut support complex and not easy to calculate. At the same time, if the soil density on the free side is not enough, it is easy to cause support settlement, resulting in problems such as the vertical flatness of the retaining wall after construction not meeting the requirements. If the free side of the retaining wall cannot form a retaining soil, the formwork method of inclined struts will not be applicable.

[0004] Therefore, it is necessary to improve the formwork structure and formwork method of the retaining wall in the existing construction process of the pile-slab retaining wall, so that unilateral formwork of the formwork of the retaining wall can be realized without being affected by the soil on the free side of the retaining wall. SUMMARY

[0005] Therefore, the present application provides a unilateral formwork system for pile-slab retaining wall and a construction method. The device fully utilizes the anti-slide piles that have been constructed as force members of the formwork of the retaining wall, and solves the problem of no support point for the formwork on the outside of the retaining wall through horizontal double-channel steel force transmission.

[0006] The unilateral formwork system for pile-slab retaining wall provided by the present application comprises a plurality of anti-slide piles arranged at predetermined positions of a slope, a retaining wall formwork arranged between adjacent anti-slide piles, and a formwork structure arranged on the free side of the retaining wall formwork. The formwork structure is used to transmit the force of the retaining wall formwork to the anti-slide piles. The formwork structure comprises a support assembly arranged on the free side of the retaining wall formwork and an adjusting assembly arranged between the support assembly and the retaining wall formwork. The adjusting assembly is used to adjust the levelness and verticality of the retaining wall formwork and to transmit the force of the retaining wall formwork to the support assembly. The support assembly, after being connected with the anti-slide piles, transmits the force received by the adjusting assembly to the anti-slide piles.

[0007] Furthermore, the support assembly includes a support beam perpendicular to the height direction of the anti-slide pile and a U-shaped connector for connecting the beam and the anti-slide pile. The open end of the U-shaped connector is fixedly connected to the anti-slide pile, and the closed end is used to support and fix the support beam.

[0008] Furthermore, it also includes a wedge block disposed between the anti-slide pile and the supporting beam, the wedge block being used to wedge the gap between the supporting beam and the anti-slide pile.

[0009] Furthermore, the adjustment assembly includes an adjustment top support and a sleeve that is connected and cooperates with the adjustment top support. The adjustment top support includes a fastening section and an abutment part. The fastening section extends into the sleeve and is fastened to the sleeve. The abutment part abuts against the retaining wall template and provides support for the retaining wall template.

[0010] Furthermore, one end of the sleeve is connected to the adjusting top support, and the other end extends into the supporting crossbeam. A limiting part is provided on the outer circumference of the sleeve to prevent the sleeve from longitudinally displacing within the supporting crossbeam.

[0011] It also includes a construction method for a single-sided formwork system for pile-slab retaining walls, which, using the aforementioned single-sided formwork system for pile-slab retaining walls, includes the following steps:

[0012] S1. Construction and maintenance of anti-slide piles;

[0013] S2. Excavate the earthwork on the open side of the retaining wall, and remove the protective layer of the anti-slide pile reinforcement at the installation location of the support beam according to the position and spacing of the support beam obtained from the design calculation, so as to expose the longitudinal main reinforcement.

[0014] S3. Install U-shaped connectors at the exposed longitudinal main reinforcement of the anti-slide pile;

[0015] S4. Tie the reinforcing bars of the retaining wall and install the retaining wall formwork and vertical secondary beams;

[0016] S5. Install the support beams into the U-shaped connectors in sequence according to the design requirements, and use them to wedge the wedges.

[0017] S6. While installing the adjustment assembly, install the horizontal main rib of the template, and adjust the length of the extension sleeve of the adjustment top support in the adjustment assembly so that the abutting part of the adjustment top support is pressed against the horizontal main rib to form support for the template.

[0018] S7. After the support is inspected and accepted, the concrete for the retaining wall is poured, and the formwork is removed after curing.

[0019] Furthermore, in step S3, the U-shaped connector is connected and fixed to the exposed longitudinal main reinforcement of the anti-slide pile by welding.

[0020] Furthermore, in step S4, before installing the retaining wall formwork and vertical secondary joists, vertical lines are marked on the side of the anti-slide pile according to the design requirements to control the position of the outer edge of the retaining wall formwork.

[0021] Furthermore, in step S6, the overall horizontality and verticality of the template are adjusted by adjusting multiple adjustment components that support the template.

[0022] Furthermore, in step S7, the template removal process is as follows: first, loosen the adjustable top support, remove the adjustable top support and sleeve, then loosen the wedge to remove the supporting channel steel, and finally remove the template.

[0023] The beneficial effects of the present invention are as follows: The single-sided formwork system and construction method for pile-slab retaining walls provided by the present invention are not limited by site conditions, do not require separate formwork support frames, and are not affected by the relative positional relationship between the retaining wall and the anti-slide piles. They can be adjusted by supporting the top support and increasing the length of the steel pipe. This single-sided formwork method only requires the setting of a supporting beam and a horizontal adjusting top support in conjunction with a short steel pipe. It is simple in structure and easy to install and dismantle. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Figure 1 This is an installation diagram of the single-sided formwork system for pile-slab retaining walls in this invention;

[0026] Figure 2 for Figure 1 AA section view;

[0027] Figure 3 This is a schematic diagram showing the interaction between the adjustment component and the support beam in this invention;

[0028] Explanation of reference numerals in the attached drawings: 1-Anti-slide pile; 2-Retaining wall formwork; 3-Retaining wall; 4-Support beam; 5-U-shaped connector; 6-Wedge block; 7-Adjusting top support; 8-Sleeve; 9-Soil side; 10-Open side; 101-Longitudinal main reinforcement; 701-Abutment part; 702-Fastening section; 801-Limiting part. Detailed Implementation

[0029] A single-sided formwork system for a pile-slab retaining wall includes several anti-slide piles 1 set at predetermined positions on the slope, retaining wall formwork 2 set between adjacent anti-slide piles 1, and a formwork structure set on the free side 10 of the retaining wall formwork. The formwork structure is used to transfer the force of the retaining wall formwork 2 to the anti-slide piles 1. The formwork structure includes a support component set on the free side of the retaining wall formwork and an adjustment component set between the support component and the retaining wall formwork. The adjustment component is used to adjust the horizontality and verticality of the retaining wall formwork and to transfer the force of the retaining wall formwork to the support component. After the support component is connected to the anti-slide piles, it receives the adjustment component. The force of the retaining wall formwork is transferred to the anti-slide pile. The formwork structure includes a support component and an adjustment component set between the support component and the retaining wall formwork. The adjustment component is mainly used to adjust the horizontality and verticality of the retaining wall formwork and to transfer the force of the retaining wall formwork to the support component. The support component is mainly used to transfer the force received by the adjustment component to the anti-slide pile after being connected to it. By setting the formwork structure on the free side of the pile-slab retaining wall, the formwork can be supported without being limited by site conditions and without the need to erect a separate support frame for the retaining wall formwork. At the same time, the formwork structure is not affected by the relative positional relationship between the retaining wall 3 and the anti-slide pile 1.

[0030] In this embodiment, the support assembly includes a support beam 4 arranged perpendicular to the height direction of the anti-slide pile 1 and a U-shaped connector 5 for connecting the support beam 4 and the anti-slide pile 1. The open end of the U-shaped connector 5 is connected and fixed to the anti-slide pile 1, and the closed end is used to support and fix the support beam 4. The support beam 4 consists of two channel steels. The U-shaped connector 5 has two φ16 U-shaped tie ring steel bars on a single anti-slide pile 1. The connecting ends of the U-shaped tie ring steel bars are connected and fixed to the exposed longitudinal main reinforcement 101 on the anti-slide pile 1 by welding, so as to ensure that the support beam 4 can be fixed on two adjacent anti-slide piles 1, and finally form the support assembly in the support structure of this area.

[0031] In this embodiment, a wedge-shaped block 6 is also included, which is disposed between the anti-slide pile 1 and the supporting beam 4. The wedge-shaped block 6 is used to wedge the gap between the supporting beam 4 and the anti-slide pile 1. Figure 1 As shown, since the anti-slide pile 1 is circular, there is a gap between the supporting beam 4 and the anti-slide pile 1. In order to ensure that the supporting beam 4 can better transmit force to the anti-slide pile 1, wedge blocks 6 are used to tighten the gap between the supporting beam 4 and the anti-slide pile 1. Two wedge blocks 6 are selected to facilitate disassembly and assembly by construction personnel.

[0032] In this embodiment, the adjusting assembly includes an adjusting top support 7 and a sleeve 8 connected and cooperating with the adjusting top support. The adjusting top support 7 includes a fastening section 702 and an abutting part 701. The fastening section 702 extends into the sleeve 8 and is fastened to the sleeve 8. The abutting part 701 abuts against the retaining wall template 2 and provides support for the retaining wall template 2. The adjusting top support 7 is a commonly used support in existing building construction. The sleeve 8 is a steel pipe with internal threads. The fastening section 702 of the adjusting top support 7 extends into the sleeve 8 and is threadedly connected to the sleeve 8, and the distance of the adjusting top support 7 extending into the sleeve 8 can be adjusted. The abutting part 701 of the adjusting top support 7 abuts against the retaining wall template 2 and provides support for the retaining wall template 2, so as to ensure that the adjusting assembly can transmit the supporting force of the retaining wall template 2 to the supporting assembly.

[0033] In this embodiment, one end of the sleeve 8 is connected to the adjusting top support 7, and the other end extends into the supporting beam 4. A limiting part 801 is provided on the outer circumference of the sleeve 8. The limiting part 801 is used to prevent the sleeve 8 from longitudinally displacing within the supporting beam 4. The limiting part 801 is located on the outer circumference of the sleeve 8 and is mainly used for the sleeve 8 to abut against the supporting beam 4 of the support assembly. Figure 3 As shown, the U-shaped connector 5 has two supporting beams 4, and one end of the sleeve 8 is inserted between the two supporting beams 4 and abuts against the supporting beams 4 through the limiting part 801. Combined with the abutting part 701 of the adjusting top support 7, it abuts against the retaining wall template 2 to achieve support and force transmission on the retaining wall template 2.

[0034] This embodiment also provides a construction method for a single-sided formwork system for pile-slab retaining walls. This construction method is applicable to pile-slab retaining walls in edge slope support design, wherein the anti-slide piles are constructed first through mechanical drilling, and the earthwork is excavated after the concrete reaches a certain strength, and the retaining wall is constructed in sections from top to bottom. This construction method includes the following steps:

[0035] S1. Construction and maintenance of anti-slide piles: First, anti-slide piles are constructed by mechanical drilling until the concrete strength of the anti-slide piles reaches the design strength.

[0036] S2. Excavate the soil on the open side of the retaining wall, and according to the position and spacing of the supporting beam 4 obtained from the design calculation, remove the protective layer of the anti-slide pile 1 reinforcement at the installation location of the supporting beam 4 to expose the longitudinal main reinforcement 101; excavate the soil outside the retaining wall in layers, excavating one layer of soil and constructing one layer of retaining wall, and gradually advance downwards until the construction of the retaining wall is completed; after the soil excavation is completed, the joint between the retaining wall and the pile should be cleaned, and it is qualified if there is no soil.

[0037] S3. Install U-shaped connector 5 at the exposed longitudinal main reinforcement 101 of the anti-slide pile;

[0038] S4. Tie the reinforcing bars of the retaining wall and install the retaining wall formwork 2 and vertical secondary ribs; the reinforcing bars of the retaining wall 2 are usually connected to the anti-slide piles 1 by rebar installation. After the reinforcing bars of the retaining wall are tied, protective layer pads or internal supports are installed to ensure that the thickness of the retaining wall section meets the requirements.

[0039] S5. According to the design requirements, install the support beam 4 into the U-shaped connector 5 in sequence, and wedge it with the wedge 6.

[0040] S6. While installing the adjustment assembly, install the horizontal main rib of the template, and adjust the length of the adjusting top support 7 extending from the sleeve 8 in the adjustment assembly so that the abutting part 701 of the adjusting top support 7 is pressed against the horizontal main rib to form support for the template; draw the horizontal spacing of the top support 7 on the support beam 4, and install the horizontal main rib of the template while placing the sleeve 8, adjusting the length of the top support as it is placed so that it is pressed against the main rib of the template.

[0041] S7. After the support is inspected and accepted, the concrete for the retaining wall is poured, and the formwork is removed after curing.

[0042] In this embodiment, in step S3, the U-shaped connector 5 is connected and fixed to the exposed longitudinal main reinforcement 101 of the anti-slide pile by welding.

[0043] In this embodiment, before installing the retaining wall template 2 and the vertical secondary ribs in step S4, vertical lines are marked on the side of the anti-slide pile according to the design requirements to control the position of the outer edge of the retaining wall template.

[0044] In this embodiment, in step S6, the overall horizontality and verticality of the template are adjusted by adjusting multiple adjustment components that support the template.

[0045] In this embodiment, the template removal process in step S7 is as follows: first, loosen the adjustable top support 7, remove the adjustable top support 7 and sleeve 8, then loosen the wedge 6 to remove the supporting beam 4, and finally remove the retaining wall template 2.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A single-sided formwork system for sheet pile retaining walls, characterized in that: The single-side formwork system for the pile-board type retaining wall comprises a plurality of anti-slide piles arranged at preset positions of a slope, a retaining wall formwork arranged between adjacent anti-slide piles, and a formwork support structure arranged at a free side of the retaining wall formwork, the formwork support structure being used for transmitting the force of the retaining wall formwork to the anti-slide piles, the formwork support structure comprising a support assembly arranged at the free side of the retaining wall formwork and an adjusting assembly arranged between the support assembly and the retaining wall formwork, the adjusting assembly being used for adjusting the horizontal degree and the vertical degree of the retaining wall formwork and transmitting the force of the retaining wall formwork to the support assembly, and the support assembly being connected with the anti-slide piles to transmit the force of the adjusting assembly to the anti-slide piles; and the single-side formwork system further comprises wedge blocks arranged between the anti-slide piles and support beams, the wedge blocks being used for wedging the gaps between the support beams and the anti-slide piles. The support assembly comprises a support beam arranged perpendicularly to the height direction of the anti-slide piles and a U-shaped connecting piece used for connecting the support beam and the anti-slide piles, the U-shaped connecting piece being connected and fixed with the anti-slide piles at an open end and being used for supporting and fixing the support beam at a closed end. The adjusting assembly comprises an adjusting top support and a sleeve connected with the adjusting top support, the adjusting top support comprising a fastening segment and an abutting part, the fastening segment being inserted into the sleeve and being fastened with the sleeve, and the abutting part being abutted on the retaining wall formwork and providing support for the retaining wall formwork.

2. The single-sided formwork system for sheet pile retaining walls according to claim 1, characterized in that: One end of the sleeve is connected with the adjusting top support, and the other end is inserted into the support beam, a limiting part is arranged on the outer circumference of the sleeve, and the limiting part is used for preventing the sleeve from being longitudinally displaced in the support beam.

3. A construction method for a single-sided formwork system of a sheet-pile retaining wall, characterized in that: The single-side formwork system for the pile-board type retaining wall is used, and the following steps are included: S1, anti-slide pile construction and maintenance; S2, earth excavation at the free side of the retaining wall, and the anti-slide pile reinforcement layer at the position and interval of the support beam obtained according to the design calculation is chipped to expose the longitudinal main reinforcement; S3, the U-shaped connecting piece is installed at the exposed longitudinal main reinforcement of the anti-slide pile; S4, the steel bar binding of the retaining wall is performed, and the retaining wall formwork and the vertical secondary bars are installed; S5, the support beam is installed in the U-shaped connecting piece in sequence according to the design requirement, and the wedge blocks are wedged; S6, the adjusting assembly is installed, the horizontal main bars of the retaining wall formwork are installed at the same time, the length of the adjusting top support extending out of the sleeve in the adjusting assembly is adjusted, the abutting part of the adjusting top support is tightly abutted on the horizontal main bars to form support for the retaining wall formwork; S7, after the support is accepted, the retaining wall concrete is poured, and the retaining wall formwork is removed after the maintenance is completed.

4. The method for constructing a single-sided formwork system for sheet pile retaining walls according to claim 3, characterized in that: In the step S3, the U-shaped connecting piece is connected and fixed with the exposed longitudinal main reinforcement of the anti-slide pile by welding.

5. The method for constructing a single-sided formwork system for sheet pile retaining wall according to claim 3, wherein: In the step S4, before the retaining wall formwork and the vertical secondary bars are installed, the vertical line is drawn on the side surface of the anti-slide pile according to the design requirement to control the position of the outer edge line of the retaining wall formwork.

6. The method for constructing a single-sided formwork system for sheet pile retaining wall according to claim 3, wherein: In the step S6, the horizontal degree and the vertical degree of the retaining wall formwork as a whole are adjusted by adjusting a plurality of adjusting assemblies which form support for the retaining wall formwork.

7. The method for constructing a single-sided formwork system for sheet pile retaining wall according to claim 3, wherein: In the step S7, the formwork removal construction process is as follows: the adjusting top support is loosened, the adjusting top support and the sleeve are taken out, the wedge blocks are loosened to take out the support channel steel, and finally the retaining wall formwork is removed.

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