Construction method for controlling installation perpendicularity of CT clamping groove assembly type underground diaphragm wall

Abstract

The invention discloses a construction method for controlling the installation perpendicularity of a CT clamping groove assembly type underground diaphragm wall. After it is confirmed that grooving of the underground diaphragm wall is qualified, a prefabricated wall is hoisted through the following steps that (3-1) the prefabricated wall is lowered along a guide wall; (3-2) penetrating a solid steel bar into a lower lifting hole of the double-lug lifting bar, and enabling the prefabricated wall body to be crossly supported on the guide wall; 3-3) measuring the elevations of the four corners of the top surface of the prefabricated wall body, and calculating the height difference; (3-4) an adjusting base plate is placed between the lower lifting hole of the double-lug lifting bar and the solid steel bar, and leveling is conducted; (3-5) repeating the steps (3-3)-(3-4) until the height difference of the four corners of the top surface is smaller than a set threshold value; and (3-6) the side face perpendicularity of the prefabricated wall is detected, and if the side face perpendicularity is larger than a set threshold value, the step (3-3) to the step (3-5) are repeated till the side face perpendicularity is smaller than the set threshold value. According to the method, the T clamping head of the rear-row-width prefabricated wall can be smoothly and completely inserted into the C clamping groove of the front-row-width prefabricated wall.

Description

Technical Field

[0001] The invention relates to a construction method of a ground-connected wall, in particular to a construction method for controlling the installation verticality of a CT slot assembled ground-connected wall. Background Art

[0002] At present, Yonglin combined prefabricated ground-anchored wall has gradually replaced the conventional SMW construction method. The construction technology of Yonglin combined prefabricated ground-anchored wall can not only greatly save construction site and construction period, but also save energy and reduce emissions, and be green and environmentally friendly. However, the allowable deviation of the C slot and T head of the CT slot type Yonglin combined prefabricated ground-anchored wall in the thickness direction is only 2cm, and the allowable deviation in the width direction is only 2.2cm. Therefore, the CT slot type prefabricated ground-anchored wall has extremely high requirements for verticality during the lowering process. In addition, during the lowering process of the prefabricated ground-connected wall, the verticality of the prefabricated ground-connected wall often fails to meet the design requirements due to the deviation of the guide wall elevation and the pre-embedded hanging bars. When the verticality deviation of the prefabricated wall of the first section is large, the T-head of the prefabricated wall of the second section is difficult to fully insert into the C-slot of the prefabricated wall of the first section. At this time, the prefabricated wall of the second section is stuck on the prefabricated wall of the first section, unable to go up or down. The exposed part of the upper part needs to be chiseled off, and a row of reinforcement piles needs to be installed on the outside of the lower suspended part. After the excavation is completed in the later stage, the cast-in-place side wall will be re-installed. This not only prolongs the construction period and increases the construction cost, but also creates safety hazards for the later operation. Therefore, the construction method of controlling the verticality of the prefabricated wall installation is the key factor for the smooth construction of the prefabricated ground-connected wall in the form of CT slots. Summary of the invention

[0003] The present invention provides a construction method for controlling the verticality of CT slot assembled ground-connected wall installation to solve the technical problems existing in the known technology. The construction method can make the T-clip of the rear prefabricated wall smoothly and completely inserted into the C-clip of the front prefabricated wall.

[0004] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a construction method for controlling the verticality of the CT slot assembled ground-connected wall installation, adopting the following steps:

[0005] 1) Prefabricated ground-connected wall, each prefabricated wall is provided with two left and right side surfaces, a top surface and a bottom surface, a C-shaped slot is provided in the middle of one of the two side surfaces, and a T-shaped head is provided in the middle of the other side surface, the C-shaped slot and the T-shaped head are arranged along the length direction of the ground-connected wall, and two left and right transverse through grooves are provided on the top surface, and two front and rear double-ear hanging bars are provided in each of the transverse through grooves, each of the double-ear hanging bars is formed by welding two single-ear hanging bars with an upper and lower offset, and is provided with two upper and lower offset hanging holes, which are an upper hanging hole and a lower hanging hole, respectively, and the center lines of the upper hanging hole and the lower hanging hole extend in the longitudinal direction of the transverse through groove, the top of each double-ear hanging bar is flush with the top surface of the prefabricated wall, the two hanging holes of the double-ear hanging bar are both located in the transverse through groove, and the part below the two hanging holes of the double-ear hanging bar is pre-buried in the prefabricated wall;

[0006] 2) Confirm that the ground connection wall groove is qualified;

[0007] 3) Use the following steps to hoist each prefabricated wall:

[0008] 3-1) Use the upper hanging holes of the double-ear hanging rods to lower the prefabricated wall along the guide wall;

[0009] 3-2) When the prefabricated wall is lowered until the bottom of the lower hanging hole of the double-ear hanger is flush with the top of the guide wall, insert the solid steel rod into the lower hanging hole of the double-ear hanger and place the prefabricated wall cross-arm on the guide wall;

[0010] 3-3) Use a level to measure the four corners of the top surface of the prefabricated wall and calculate the height difference based on the measured data;

[0011] 3-4) Lift the prefabricated wall and place an adjustment pad between the lower hanging hole of the double-ear hanger and the solid steel rod according to the height difference measured in step 3-3);

[0012] 3-5) Repeat steps 3-3) to 3-4) until the height difference of the four corners of the top surface of the prefabricated wall is less than the set threshold;

[0013] 3-6) Use ultrasonic waves to detect the verticality of the side of the prefabricated wall. If the verticality of the side is greater than the set threshold, repeat steps 3-3) to 3-5) until the verticality of the side is less than the set threshold.

[0014] The height difference threshold of the four corners of the top surface of the prefabricated wall is set to 5mm.

[0015] The verticality threshold of the side of the prefabricated wall is set at 3‰.

[0016] The thickness of a single adjustment pad is any one of 1 mm, 2 mm and 5 mm.

[0017] The advantages and positive effects of the present invention are: by adding an adjustment pad between the double-ear hanger and the solid steel rod, the horizontality of the top surface of the prefabricated wall and the verticality of the side surface are adjusted, thereby ensuring the installation verticality of the prefabricated wall, so that the T-clip of the rear-row prefabricated wall can be smoothly and completely inserted into the C-clip groove of the front-row prefabricated wall. The problem of the verticality of the front-row prefabricated wall not meeting the requirements due to the unevenness of the guide wall and the pre-embedded error of the double-ear hanger is solved, and the verticality of the prefabricated wall with the cross arm on the solid steel rod meets the design requirements is ensured, and a series of quality and safety problems caused by the difficulty of fully lowering the rear-row due to the verticality of the front-row prefabricated wall not meeting the requirements are avoided, thereby improving construction efficiency and reducing construction costs. In addition, the present invention is simple to construct, highly practical, and has a high utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a plan view schematic diagram of the application of the present invention;

[0019] Figure 2 It is a schematic elevation diagram of the application of the present invention.

[0020] In the figure: 1. Prefabricated wall, 1-1. C-shaped slot, 1-2. T-shaped clamp, 1-3. Horizontal through slot, 1-4. Double-ear hanger, 2. Guide wall, 3. Solid steel rod, 4. Adjustment pad. DETAILED DESCRIPTION

[0021] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0022] See also Figure 1 and Figure 2 A construction method for controlling the verticality of the CT slot assembled ground-connected wall installation, using the following steps:

[0023] 1) Prefabricated ground-connected wall, each prefabricated wall 1 is provided with two left and right side surfaces, a top surface and a bottom surface, a C-shaped card slot 1-1 is provided in the middle of one of the two side surfaces, and a T-shaped card head 1-2 is provided in the middle of the other side surface, the C-shaped card slot 1-1 and the T-shaped card head 1-2 are arranged along the length direction of the ground-connected wall, and two left and right transverse through grooves 1-3 are provided on the top surface, and two front and rear double-ear suspension bars 1-4 are provided in each of the transverse through grooves 1-3, each The double-ear suspension rod 1-4 is formed by welding two single-ear suspension rods with an upper and lower offset, and is provided with two upper and lower offset hanging holes, namely an upper hanging hole and a lower hanging hole. The center lines of the upper hanging hole and the lower hanging hole extend longitudinally along the transverse through groove 1-3. The top of each double-ear suspension rod 1-4 is flush with the top surface of the prefabricated wall 1. The two hanging holes of the double-ear suspension rod 1-4 are both located in the transverse through groove 1-3, and the parts below the two hanging holes of the double-ear suspension rod 1-4 are pre-buried in the prefabricated wall 1.

[0024] 2) Confirm that the trenching of the ground-anchored wall is qualified. After the trenching of the ground-anchored wall is completed, testing is required and subsequent construction can be carried out only after it is confirmed that the trenching is qualified.

[0025] 3) Use the following steps to hoist each prefabricated wall 1:

[0026] 3-1) Using the upper hanging holes of the double-ear hanging rods 1-4, lower the prefabricated wall 1 along the guide wall 2;

[0027] 3-2) When the prefabricated wall 1 is lowered to the point where the bottom of the lower hanging hole of the double-ear hanger 1-4 is flush with the top of the guide wall 2, the solid steel rod 3 is inserted into the lower hanging hole of the double-ear hanger 1-4, and the prefabricated wall 1 is cross-armed on the guide wall 2. Due to the height difference between the guide wall elevations H and h, the pre-embedded deviation of the hanger, etc., the verticality of the prefabricated wall 1 may not meet the design requirements after it is lowered. Therefore, the following steps are required for adjustment.

[0028] 3-3) Use a level to measure the four corners of the top surface of the prefabricated wall 1 and calculate the height difference based on the measured data.

[0029] 3-4) Lift the prefabricated wall 1, and according to the height difference measured in step 3-3), place an adjustment pad 4 between the lower hanging hole of the double-ear hanger 1-4 and the solid steel rod 3 to level the top surface of the prefabricated wall.

[0030] 3-5) Repeat step 3-3) to step 3-4) until the height difference of the four corners of the top surface of the prefabricated wall 1 is less than the set threshold. In this embodiment, the allowable deviation of the C-cage and T-cage of the prefabricated wall in the thickness direction is 2 cm, and the allowable deviation in the width direction is 2.2 cm. The height difference setting threshold of the four corners of the top surface of the prefabricated wall is 5 mm, and the preferred height difference setting threshold is 1 mm.

[0031] 3-6) Use ultrasound to detect the side verticality of the prefabricated wall 1. If the side verticality is greater than its set threshold, repeat steps 3-3) to 3-5) until the side verticality is less than its set threshold. In this embodiment, the side verticality set threshold is 3‰.

[0032] The above-mentioned side verticality setting threshold and the above-mentioned height difference setting threshold can be determined through simulation.

[0033] In this embodiment, the thickness of a single adjustment pad is any one of 1 mm, 2 mm and 5 mm.

[0034] Multiple engineering practices have shown that the above construction method can effectively control the installation verticality of the CT slot prefabricated ground-connected wall, ensuring that the T-clip of the rear prefabricated wall can be smoothly and completely inserted into the C-clip of the front prefabricated wall, and the rear prefabricated wall will not be stuck on the front prefabricated wall.

[0035] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which belong to the scope of protection of the present invention.

Claims

1. A construction method for controlling the verticality of CT slot assembled ground-connected wall installation, characterized in that: Use the following steps: 1) Prefabricated ground-connected wall, each prefabricated wall is provided with two left and right side surfaces, a top surface and a bottom surface, a C-shaped slot is provided in the middle of one of the two side surfaces, and a T-shaped head is provided in the middle of the other side surface, the C-shaped slot and the T-shaped head are arranged along the length direction of the ground-connected wall, and two left and right transverse through grooves are provided on the top surface, and two front and rear double-ear hanging bars are provided in each of the transverse through grooves, each of the double-ear hanging bars is formed by welding two single-ear hanging bars with an upper and lower offset, and is provided with two upper and lower offset hanging holes, which are an upper hanging hole and a lower hanging hole, respectively, and the center lines of the upper hanging hole and the lower hanging hole extend in the longitudinal direction of the transverse through groove, the top of each double-ear hanging bar is flush with the top surface of the prefabricated wall, the two hanging holes of the double-ear hanging bar are both located in the transverse through groove, and the part below the two hanging holes of the double-ear hanging bar is pre-buried in the prefabricated wall; 2) Confirm that the ground connection wall groove is qualified; 3) Use the following steps to hoist each prefabricated wall: 3-1) Use the upper hanging holes of the double-ear hanging rods to lower the prefabricated wall along the guide wall; 3-2) When the prefabricated wall is lowered until the bottom of the lower hanging hole of the double-ear hanger is flush with the top of the guide wall, insert the solid steel rod into the lower hanging hole of the double-ear hanger and place the prefabricated wall cross-arm on the guide wall; 3-3) Use a level to measure the four corners of the top surface of the prefabricated wall and calculate the height difference based on the measured data; 3-4) Lift the prefabricated wall and place an adjustment pad between the lower hanging hole of the double-ear hanger and the solid steel rod according to the height difference measured in step 3-3); 3-5) Repeat steps 3-3) to 3-4) until the height difference of the four corners of the top surface of the prefabricated wall is less than the set threshold; 3-6) Use ultrasonic waves to detect the verticality of the side of the prefabricated wall. If the verticality of the side is greater than the set threshold, repeat steps 3-3) to 3-5) until the verticality of the side is less than the set threshold.

2. The construction method for controlling the verticality of the CT slot assembled ground-connected wall installation according to claim 1 is characterized in that: The height difference threshold of the four corners of the top surface of the prefabricated wall is set to 5mm.

3. The construction method for controlling the verticality of the CT slot assembled ground-connected wall installation according to claim 1 is characterized in that: The verticality threshold of the side of the prefabricated wall is set at 3‰.

4. The construction method for controlling the verticality of the CT slot assembled ground-connected wall installation according to claim 1 is characterized in that: The thickness of a single adjustment pad is any one of 1 mm, 2 mm and 5 mm.

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