Construction method of single-side formwork of concrete support structure

Abstract

The application relates to the technical field of single-face formwork construction of a surrounding purlin structure, and discloses a construction method of a single-face formwork of a concrete supporting structure, which comprises a cast-in-place pile, a plurality of expansion screws are fixedly installed on one side of the cast-in-place pile, a tension screw rod is fixedly installed at one end of the expansion screw, a surrounding purlin formwork is fixedly installed on the outer wall of the tension screw rod, a plurality of mounting holes are formed in one side of the surrounding purlin formwork, the surrounding purlin formwork is connected with the tension screw rod through the mounting holes, a secondary batten is installed on one side of the surrounding purlin formwork, and a primary batten is installed on one side of the secondary batten; the surrounding purlin formwork is installed by using the expansion screw and the tension screw rod after being subjected to bending treatment, the reinforcing strength of the surrounding purlin formwork can be effectively improved, the risk of formwork explosion can be reduced, the work efficiency can be improved, the construction period can be shortened, the number of inclined braces on the outer side of the surrounding purlin can be reduced, the cost can be reduced, and certain economic benefits can be brought.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of single-face formwork construction of surrounding purlin structure, and more particularly to a construction method of single-face formwork construction of concrete support structure. BACKGROUND

[0002] In deep foundation pit engineering in deep silt soft soil layer in Shanghai, bored piles, triaxial mixing piles and two-way concrete supports are often used for the design and construction of deep foundation pit support, among which, the two-way support surrounding purlin is mostly a high beam with a beam width of 1200mm-1400mm. Because the other side is a bored pile, only single-face formwork can be used for the two-way support surrounding purlin, and the two-way support surrounding purlin cannot be directly reinforced by using a screw rod. If the two-way support surrounding purlin is only supported by single-face formwork without using a screw rod for reinforcement, the risk of formwork explosion will be greatly increased, and the forming quality and construction progress of the surrounding purlin will be seriously affected. SUMMARY

[0003] The purpose of the present application is to provide a construction method of single-face formwork construction of concrete support structure, which can effectively improve the reinforcement strength of the surrounding purlin formwork and reduce the risk of formwork explosion.

[0004] The technical scheme adopted by the present application is as follows: a construction method of single-face formwork construction of concrete support structure, comprising a bored pile, wherein the bored pile is fixedly installed with a plurality of expansion screws on one side, the expansion screws are fixedly installed with a tensioning screw rod at one end, the tensioning screw rod is fixedly installed with a surrounding purlin formwork on the outer wall, the surrounding purlin formwork is provided with a plurality of installation holes on one side, and the surrounding purlin formwork is connected with the tensioning screw rod through the installation holes, a secondary beam is installed on one side of the surrounding purlin formwork, and a primary beam is installed on one side of the secondary beam.

[0005] The construction method comprises the following steps:

[0006] S1, bending one end of the expansion screw;

[0007] S2, detecting the elevation on the surface of the bored pile and drawing an elevation line for installing the surrounding purlin formwork, and driving the expansion screws into the surface of the bored pile according to the positions of the elevation line;

[0008] S3, bending one end of the tensioning screw rod and using steel bars to make a steel cage;

[0009] S4, connecting the bent one end of the tensioning screw rod with the bent one end of the expansion screw;

[0010] S5, pouring cement into the steel cage to make a surrounding purlin formwork, installing the surrounding purlin formwork on the tensioning screw rod and fixing the surrounding purlin formwork.

[0011] Optionally, a bending machine is used to form a hook shape at one end of the expansion screw and one end of the tensioning screw rod, and a threaded groove is formed on the surface of the other end of the tensioning screw rod.

[0012] Optionally, according to the size of the prefabricated girt template, draw the elevation line on the surface of the cast-in-place pile with chalk, and the length of the elevation line is the same as the length of the girt template installed on one side of the surface of the cast-in-place pile, mark the installation points of the expansion screws on the elevation line, and the installation points are evenly distributed on the elevation line.

[0013] Optionally, punch holes at the positions of the installation points marked on the surface of the cast-in-place pile, and install the expansion screws into the holes at the installation points, and the expansion screws are installed during construction.

[0014] Optionally, connect the bent end of the tension screw rod to the bent end of the expansion screw, and adjust the tension screw rod to be perpendicular to the cast-in-place pile.

[0015] Optionally, when using steel bars to make the steel reinforcement cage, adjust the position of the steel bars according to the installation position of the expansion screws on the elevation line, and leave space for the installation of the tension screw rod to prevent affecting the installation of the tension screw rod.

[0016] Optionally, pour cement and gravel into the steel reinforcement cage, and wait for the cement to dry to form the girt template, and according to the installation position of the expansion screws on the elevation line during pouring of the cement and gravel, reserve installation holes for the installation of the girt template and the tension screw rod.

[0017] Optionally, after the girt template is formed, punch a notch on the side of the girt template installed with the cast-in-place pile, the position of the notch is above the installation hole, and a positioning assembly is bonded in the notch through glue, the positioning assembly comprises a mounting frame, a sliding groove, a spring and a guide plate, the mounting frame is fixedly installed on the groove wall of the notch through glue, the sliding groove is opened in the inner wall bottom end of the mounting frame, the spring is fixedly installed on one side of the inner wall of the mounting frame, the guide plate is fixedly installed on one end of the spring, the guide plate is slidingly installed on the groove wall of the sliding groove, and one end of the guide plate extends to the outer wall of the mounting frame.

[0018] Optionally, install the girt template on the tension screw rod through the installation hole above the girt template, install the secondary ridge on one side of the girt template, install the primary ridge on one side of the secondary ridge, and the tension screw rod penetrates through the secondary ridge and the primary ridge, and the fixed nut is installed on one end of the tension screw rod with a thread groove to fasten the tension screw rod.

[0019] The technical effects obtained by the application are as follows:

[0020] The expansion screws and the tension screw rod after the bending treatment are used to install the girt template, which can effectively improve the reinforcement strength of the girt template, reduce the risk of mold explosion, improve the work efficiency, shorten the construction period, reduce the number of diagonal braces outside the girt, reduce the cost, and bring certain economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 The construction flowchart of the present application;

[0023] Figure 2 The single-side formwork schematic diagram of the present application;

[0024] Figure 3 The reinforcement cage diagram of the present application;

[0025] Figure 4 The expansion screw diagram of the present application;

[0026] Figure 5 The installation frame installation position diagram of the present application.

[0027] In the drawings, the component list represented by each number is as follows:

[0028] 1, expansion screw; 2, counter-pulling screw rod; 3, reinforcement cage; 4, secondary beam; 5, main beam; 6, cast-in-place pile; 7, surrounding purlin formwork; 8, installation frame; 9, sliding groove; 10, spring; 11, guide plate; 12, installation hole. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present application.

[0030] Embodiment 1

[0031] S1, bend one end of the expansion screw 1, use a bending machine to form a hook shape at one end of the expansion screw 1 and one end of the counter-pulling screw rod 2, and open a threaded groove at the other end surface of the counter-pulling screw rod 2, which is used for installing a fixing nut, and the counter-pulling screw rod 2 and the surrounding purlin formwork 7 are fixed.

[0032] In this example, the expansion screw 1 can be selected as an M8*70 expansion screw.

[0033] S2, detect the elevation on the surface of the cast-in pile 6, draw the elevation line of the installation of the surrounding purlin template 7, and punch the expansion screw 1 into the surface of the cast-in pile 6 according to the position of the elevation line. The elevation line is drawn on the surface of the cast-in pile 6 using chalk according to the size of the surrounding purlin template 7, and the length of the elevation line is the same as the length of the surrounding purlin template 7 installed on one side of the surface of the cast-in pile 6. Mark the installation points of the expansion screw 1 on the elevation line, and the installation points are evenly distributed on the elevation line. Punch holes at the positions of the installation points marked on the surface of the cast-in pile 6, and install the expansion screw 1 into the holes at the installation points. When the expansion screw 1 is installed, the bending hook direction is consistent and upward, which is convenient for connecting with the screw rod.

[0034] In this example, the vertical spacing of the elevation line can be 40 cm, and the horizontal spacing of the installation point can be 50 cm.

[0035] S3, use steel binding to make the steel cage 3. When using steel binding to make the steel cage 3, adjust the position of the steel according to the installation position of the expansion screw 1 on the elevation line to leave space for the installation of the tension rod 2 and prevent affecting the installation of the tension rod 2. Pour cement and gravel into the steel cage 3 and wait for the cement to dry to form the surrounding purlin template 7. When pouring cement and gravel, adjust the position of the steel according to the installation position of the expansion screw 1 on the elevation line to reserve installation holes 12 for the installation of the surrounding purlin template 7 and the tension rod 2.

[0036] In this example, when pouring cement and gravel into the steel cage 3, a soil pit can be dug according to the size of the surrounding purlin template 7, and the steel cage 3 is placed in the soil pit. According to the position of the reserved installation hole 12, a wooden stick with the same diameter as the installation hole 12 is inserted into the steel cage 3, and the two ends of the wooden stick are inserted into the inner wall surface of the soil pit to make the steel cage 3 suspended in the soil pit. Pour cement and mortar into the soil pit and wait for the cement to solidify to obtain the surrounding purlin template 7.

[0037] S4, connect the bent end of the tension rod 2 with the bent end of the expansion screw 1, connect the bent end of the tension rod 2 with the bent end of the expansion screw 1, and adjust the tension rod 2 to be perpendicular to the cast-in pile 6.

[0038] After connecting the tension rod 2 with one end of the expansion screw 1, the expansion screw 1 is punched into the cast-in pile 6 again for a distance, so that the bent end of the expansion screw 1 presses the bent end of the tension rod 2, and the tension rod 2 is fixed.

[0039] S5, pour cement into the steel cage 3 to make the surrounding purlin template 7, install the surrounding purlin template 7 on the tension rod 2 and fix the surrounding purlin template 7, install the surrounding purlin template 7 on the tension rod 2 through the installation hole 12 on it, install the secondary beam 4 on one side of the surrounding purlin template 7, install the primary beam 5 on one side of the secondary beam 4, and the tension rod 2 penetrates the secondary beam 4 and the primary beam 5. Install the fixed nut at one end of the tension rod 2 with a threaded groove to tighten the tension rod 2.

[0040] In the installation of the surrounding purlin template 7, the connecting rope is wound around the surrounding purlin template 7 once, the connecting head of the crane is connected to the connecting rope, the surrounding purlin template 7 is lifted and hoisted to one end of the tensioning screw rod 2, the workers cooperate to align the installation holes 12 on the surrounding purlin template 7 with the tensioning screw rod 2 one by one, the surrounding purlin template 7 is moved by the crane, the surrounding purlin template 7 is installed on the tensioning screw rod 2, and the surrounding purlin template 7 is installed at one end of the tensioning screw rod 2 through the fixing nut. By tightening the fixing nut, the main beam 5 can press the surrounding purlin template 7 tightly on one side of the cast-in-place pile 6, so that the side of the surrounding purlin template 7 located on one side of the cast-in-place pile 6 is fixed. This can effectively improve the reinforcement strength, reduce the risk of mold explosion, improve the work efficiency, shorten the construction period, reduce the number of diagonal braces outside the surrounding purlin, reduce the cost, and bring certain economic benefits.

[0041] Example 2

[0042] After the surrounding purlin template 7 is formed, a notch is punched on the side where the surrounding purlin template 7 and the cast-in-place pile 6 are installed. The notch is located above the installation hole 12. A positioning assembly is bonded in the notch by glue. The positioning assembly includes an installation frame 8, a sliding groove 9, a spring 10, and a guide plate 11. The installation frame 8 is fixedly installed on the notch wall by glue. The sliding groove 9 is opened in the inner wall bottom end of the installation frame 8. The spring 10 is fixedly installed on one side of the inner wall of the installation frame 8. The guide plate 11 is fixedly installed on one end of the spring 10. The guide plate 11 is slidingly installed on the groove wall of the sliding groove 9. One end of the guide plate 11 extends to the outer wall of the installation frame 8

[0043] In this example, in the installation of the surrounding purlin template 7, the connecting rope is wound around the surrounding purlin template 7 once, the connecting head of the crane is connected to the connecting rope, the surrounding purlin template 7 is lifted and hoisted to one end of the tensioning screw rod 2, the workers cooperate to align the installation holes 12 on the surrounding purlin template 7 with the tensioning screw rod 2 one by one. When the workers align the installation holes 12 and the tensioning screw rod 2, the spring 10 supports the guide plate 11 to pop out on one side of the surrounding purlin template 7. One end of the guide plate 11 is an arc plate. The guide plate 11 is aligned with the tensioning screw rod 2, and the guide plate 11 is on the outer wall of the tensioning screw rod 2, so that the installation between the tensioning screw rod 2 and the installation hole 12 is more convenient. After the surrounding purlin template 7 is fixed, the guide plate 11 is pressed back into the installation frame 8 by the cast-in-place pile 6. When the surrounding purlin template 7 is moved, a wooden pile can be placed at the bottom end of the surrounding purlin template 7. The height of the wooden pile can be adjusted according to the installation position of the surrounding purlin template 7. The wooden pile supports the surrounding purlin template 7, which can make the surrounding purlin template 7 move more conveniently.

[0044] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and get the best results from the application. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A construction method of a single-sided formwork of a concrete support structure, applied to a single-sided formwork construction of a surrounding purlin structure, characterized in that, The utility model provides a kind of construction method of pile foundation, including perfusion pile (6), the perfusion pile (6) one side is fixedly installed with several expansion screws (1), the expansion screw (1) one end is fixedly installed with counter pull screw rod (2), the counter pull screw rod (2) outer wall is fixedly installed with surrounding purlin template (7), the surrounding purlin template (7) one side is equipped with several installation holes (12), and surrounding purlin template (7) is connected with the counter pull screw rod (2) by the installation hole (12), the surrounding purlin template (7) one side is installed with secondary beam (4), the secondary beam (4) one side is installed with main beam (5); The construction method comprises the following steps: S1, bend one end of the expansion screw (1); S2, detect the elevation on the surface of the perfusion pile (6) and draw an elevation line for installing the surrounding purlin template (7), and then drive the expansion screw (1) into the surface of the perfusion pile (6) according to the position of the elevation line; S3, bend one end of the counter pull screw rod (2) and make the steel reinforcement cage (3) by using steel reinforcement binding; S4, connect the bent one end of the counter pull screw rod (2) with the bent one end of the expansion screw (1); S5, pour cement into the steel reinforcement cage (3) to make the surrounding purlin template (7), install the surrounding purlin template (7) on the counter pull screw rod (2) and fix the surrounding purlin template (7); After the surrounding purlin template (7) is formed, a notch is punched on the side of the surrounding purlin template (7) and the perfusion pile (6), the notch is located above the installation hole (12), and a positioning assembly is bonded in the notch by using glue, the positioning assembly comprises a mounting frame (8), a sliding groove (9), a spring (10) and a guide plate (11), the mounting frame (8) is fixedly installed on the notch wall by using glue, the sliding groove (9) is opened on the inner wall bottom end of the mounting frame (8), the spring (10) is fixedly installed on one side of the inner wall of the mounting frame (8), the guide plate (11) is fixedly installed on one end of the spring (10), and the guide plate (11) is slidingly installed on the groove wall of the sliding groove (9), and one end of the guide plate (11) extends to the outer wall of the mounting frame (8).

2. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: Use a bending machine to form a hook shape at one end of the expansion screw (1) and one end of the counter pull screw rod (2), and a threaded groove is formed on the surface of the other end of the counter pull screw rod (2).

3. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: Draw an elevation line on the surface of the perfusion pile (6) using chalk according to the size of the surrounding purlin template (7), the length of the elevation line is the same as the length of the surrounding purlin template (7) installed on one side of the surface of the perfusion pile (6), and mark the installation points of the expansion screw (1) on the elevation line, and the installation points are evenly distributed on the elevation line.

4. The construction method of one-sided formwork of a concrete support structure according to claim 3, characterized in that: Punch holes at the installation point positions marked on the surface of the perfusion pile (6), and install the expansion screw (1) into the holes at the installation points.

5. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: Connect the bent one end of the counter pull screw rod (2) with the bent one end of the expansion screw (1), and adjust the counter pull screw rod (2) to be perpendicular to the perfusion pile (6).

6. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: When making the steel reinforcement cage (3) by using steel reinforcement binding, adjust the position of the steel reinforcement according to the installation position of the expansion screw (1) on the elevation line, leave space for installing the counter pull screw rod (2) to prevent affecting the installation of the counter pull screw rod (2).

7. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: In the reinforcement cage (3) pour in cement and sand and wait for the cement to dry to form the purlin formwork (7), when pouring cement and sand adjust the position of the reinforcement according to the installation position of the expansion screw (1) on the elevation line to reserve installation holes (12) for the installation of the purlin formwork (7) and the tensioning screw rod (2).

8. The construction method of one-sided formwork of a concrete support structure according to claim 1, characterized in that: Install the purlin formwork (7) on the tensioning screw rod (2) through the installation holes (12) on it, install the secondary joist (4) on one side of the purlin formwork (7), install the primary joist (5) on one side of the secondary joist (4), the tensioning screw rod (2) penetrates the secondary joist (4) and the primary joist (5), and a fixed nut is installed at the end of the tensioning screw rod (2) with a threaded groove to fasten the tensioning screw rod (2).

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