Construction method for positioning transverse steel bars of top beam of SMW (soil mixing wall) pile

Abstract

The invention discloses a construction method for positioning transverse steel bars of top beams of SMW (soil mixing wall) piles, which comprises the following steps of: providing various brackets, and selecting adaptive heights of vertical rods and the number and spacing of transverse rods according to different design sizes of the top beams; the supports are arranged at intervals according to the interval of every three pieces of H-shaped steel; according to the method, the steel bar binding construction efficiency is improved, deviation of a concrete protection layer and the steel bars is prevented from exceeding the standard requirement, and the influence on the safety of a foundation pit supporting system structure is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of crown beam construction, and more specifically, to a construction method for positioning the horizontal steel bars of the crown beam of SMW method piles. Background Art

[0002] During the construction of SMW method piles, the temporary support of steel bars before the binding of the crown beam steel bars has always been a thorny problem in the actual construction of concrete projects. The traditional method is to use temporary stirrups to support the steel bars before the binding of the steel bars. This method can only support the steel bars and cannot play a role in fixing the corresponding positions of the horizontal multi-layer steel bars. Moreover, the steel bars are prone to deviation, resulting in insufficient steel bar cover. When binding the horizontal steel bars, the stirrup frame needs to be removed before binding, which makes the construction of on-site workers laborious and time-consuming. And when supporting heavier steel bars, the stressed soil body may sink, resulting in an unattractive concrete after pouring. In this way, the construction quality cannot be effectively guaranteed, and it is easy to cause waste of time and manpower, and the safety of the foundation pit support system cannot be well guaranteed.

[0003] At present, there is no targeted solution for the temporary support of the binding of the crown beam steel bars of SMW method piles, and there is no known effective way to solve the problem of the temporary support of the binding of horizontal steel bars. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a construction method for positioning the horizontal steel bars of the crown beam of SMW method piles, improve the construction efficiency of steel bar binding, avoid the steel bar cover and the deviation of steel bars exceeding the specification requirements, and avoid affecting the structural safety of the foundation pit support system.

[0005] The present invention adopts the following technical solutions:

[0006] A construction method for positioning the horizontal steel bars of the crown beam of SMW method piles, comprising the following steps:

[0007] (1). Provide a variety of brackets, and select the appropriate vertical rod height, the number and spacing of horizontal rods according to different crown beam design dimensions.

[0008] (2). The bracket spacing is arranged to place one every three H-shaped steels.

[0009] (3). The brackets are directly poured into the concrete without being removed.

[0010] Further, before installing the brackets, first clean the soil in the middle of the H-shaped steel.

[0011] Further, when installing the brackets, first hook the hook on the web of the H-shaped steel, then hook the hook on the highest horizontal rod, and the horizontal steel bars are respectively placed on the horizontal rods at different heights, and the direction of the negative steel bars is perpendicular to the direction of the horizontal rods.

[0012] Furthermore, the pull hook is in a "冖" shape, each pull hook is 400mm long, the upper end is hung on the web of the H-shaped steel, and the lower end is hung on the cross bar. The cross bar is vertically fixed to the vertical bar, and two positioning ribs are welded at each end of the cross bar.

[0013] Furthermore, the height of the vertical pole is set according to the height of the H-shaped steel exposed from the first layer of soil, and a short steel bar is welded to the bottom end of the vertical pole as a foot support.

[0014] Furthermore, the hook, crossbar and vertical pole are all made of steel bars, the length of the crossbar is 900-1200mm; the height of the vertical pole is 600-1200mm.

[0015] Furthermore, two draw hooks are arranged side by side at a certain interval, a cross bar is horizontally erected, the cross bar is welded to the sides of the two vertical bars, and the cross bars are parallel to each other to form a bracket.

[0016] Furthermore, the hooks and the positioning bars are HPB400 steel bars with a diameter of 12 mm, and the cross bars and the vertical bars are HRB400 steel bars with a diameter of 25 mm.

[0017] Furthermore, the crossbar spacing is 100mm-200mm.

[0018] Beneficial Effects

[0019] The invention facilitates reinforcement workers to tie the transverse reinforcement of the SMW pile crown beam, thereby improving work efficiency; the invention is assembled from small components, is easy to use, and can be quickly installed; the invention can be used by personnel for simple operation without relying on machinery; the invention saves material, is economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view after construction of an embodiment of the present invention;

[0021] Figure 2 This is a right side view after construction of an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] As shown in the figure, the present invention discloses a construction method for positioning the transverse reinforcement of the crown beam of a SMW method pile, comprising the following steps:

[0024] (1) Provide a variety of brackets, wherein the brackets include a crossbar 5, a vertical bar 3, a hook 2 and a positioning rib 6. The height of the vertical bar 3 and the number and spacing of the crossbar 5 are selected according to the different design dimensions of the crown beam.

[0025] (2) The spacing between supports is one for every three H-shaped steels, which can ensure that the steel bars do not fall to the ground and control the thickness of the concrete cover and the steel bar deviation value within the standard value, thus ensuring the structural safety of the foundation pit support system.

[0026] (3) The bracket is poured directly into the concrete without being dismantled, eliminating the dismantling operation and further improving work efficiency.

[0027] In one embodiment of the present invention, before installing the bracket, the soil in the middle of the H-shaped steel 1 is cleaned.

[0028] In one embodiment of the present invention, when installing the bracket, the hook 2 is first hooked on the web of the H-shaped steel 1, and then the hook 2 is hooked on the highest crossbar 5 to ensure that most of the bearing force acts on the H-shaped steel 1 to avoid the depression of the bottom soil. The transverse steel bars are respectively placed on the crossbars 5 at different heights, and the positioning bars 6 play a role in preventing the steel bars from being deviated beyond the requirements of the specification. The direction of the negative bars is perpendicular to the direction of the crossbar 5.

[0029] In one embodiment of the present invention, the hook 2 is in a "冖" shape, each hook 2 is 400 mm long, the upper end is hung on the web of the H-shaped steel 1, and the lower end is hung on the cross bar 5. The cross bar 5 is vertically fixed to the vertical bar 3, and two positioning ribs 6 are welded at both ends of the cross bar 5.

[0030] In one embodiment of the present invention, the height of the vertical pole is set according to the height of the H-shaped steel 1 exposed from the first layer of soil, and a short steel bar is welded to the bottom end of the vertical pole as a foot support.

[0031] In one embodiment of the present invention, the draw hook, the cross bar and the vertical bar are all steel bars, the length of the cross bar is 900-1200 mm, and the height of the vertical bar is 600-1200 mm.

[0032] In one embodiment of the present invention, two draw hooks are arranged side by side at a certain interval, a cross bar is horizontally erected, the cross bar is welded to the sides of two vertical bars, and the cross bars are parallel to each other to form a bracket.

[0033] In one embodiment of the present invention, the hooks and the positioning bars are HPB400 steel bars with a diameter of 12 mm, and the cross bars and the vertical bars are HRB400 steel bars with a diameter of 25 mm.

[0034] In one embodiment of the present invention, the spacing between the cross bars is 100 mm to 200 mm, which is adjusted according to the number of lateral reinforcement bars 4 required by the design. The lateral reinforcement bars 4 are distributed on both sides of the H-shaped steel 1, and the lateral reinforcement bars 4 are connected to the cross bars 5. The present invention has a simple structure and is easy to manufacture, which can ensure the construction quality of the project and improve work efficiency.

[0035] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A construction method for positioning the transverse steel bars of the crown beam of SMW method piles, characterized in that: The following steps are involved: (1) Provide a variety of brackets to select the appropriate height of the vertical poles, number of horizontal poles and spacing according to the different crown beam design dimensions; (2) The bracket spacing is one for every three H-shaped steels; (3) The support is poured directly into the concrete without being removed.

2. A construction method for positioning the transverse steel bars of the crown beam of the SMW method pile, according to claim 1, characterized in that: Before installing the bracket, clean the soil in the middle of the H-beam.

3. The construction method for positioning the transverse steel bars of the crown beam of the SMW method pile, according to claim 2, is characterized in that: When installing the bracket, first hook the hook on the web of the H-shaped steel, and then hook the hook on the highest crossbar. The transverse steel bars are placed on crossbars at different heights, and the direction of the negative reinforcement is perpendicular to the direction of the crossbar.

4. A construction method for positioning the transverse steel bars of the crown beam of the SMW method pile, according to claim 3, characterized in that: The pull hook is in a "冖" shape, each pull hook is 400mm long, the upper end is hung on the web of the H-shaped steel, and the lower end is hung on the cross bar. The cross bar is fixed vertically to the vertical bar, and two positioning ribs are welded at both ends of the cross bar.

5. A construction method for positioning the transverse steel bars of the crown beam of SMW method piles according to claim 4, characterized in that: The height of the vertical pole is set according to the height of the H-shaped steel exposed from the first layer of soil, and a short steel bar is welded to the bottom of the vertical pole as a foot support.

6. A construction method for positioning the transverse steel bars of the crown beam of the SMW method pile, according to claim 5, characterized in that: The hooks, cross bars and vertical poles are all made of steel bars. The length of the cross bar is 900-1200mm; the height of the vertical pole is 600-1200mm.

7. A construction method for positioning the transverse steel bars of the crown beam of the SMW method pile, as described in claim 4, characterized in that: The two draw hooks are arranged side by side at a certain interval, a cross bar is horizontally erected, the cross bar is welded to the sides of the two vertical poles, and the cross bars are parallel to each other to form a bracket.

8. A construction method for positioning the transverse steel bars of the crown beam of SMW method piles according to claim 4, characterized in that: The hooks and positioning bars are HPB400 steel bars with a diameter of 12 mm, and the cross bars and vertical bars are HRB400 steel bars with a diameter of 25 mm.

9. A construction method for positioning the transverse steel bars of the crown beam of SMW method piles according to claim 4, characterized in that: The crossbar spacing is 100mm-200mm.

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