Steel casing positioning device

Abstract

The utility model relates to a steel casing positioning device which comprises a supporting frame, and a plurality of groups of positioning components which are uniformly distributed along the circumference up and down are arranged on the supporting frame; the positioning assembly comprises a cylindrical shell, a first piston block is arranged at the inner side end of a cavity of each shell, a supporting rod is fixed to the inner side end of each first piston block, a positioning wheel is arranged on each supporting rod, a second piston block is arranged at the outer side end of the cavity of each shell, and a threaded rod is fixed to the outer end of each second piston block. A first ventilation hole and a second ventilation hole are formed between the first piston block and the second piston block, a one-way valve is arranged in the first ventilation hole, a ventilation pipe is fixed to the outer end of the second ventilation hole, the other end of the ventilation pipe is connected with a buffering cavity, and a third piston block is arranged in the buffering cavity. Only the single-side positioning assembly needs to be adjusted, an operator does not need to adjust back and forth, and the adjusting and positioning efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of casing construction, in particular to a steel casing positioning device. Background Art

[0002] The steel casing is the main reference component for cast-in-place pile construction. Its positioning and embedding quality directly affects the subsequent construction quality. Therefore, its positioning accuracy and verticality need to be strictly controlled. When the existing steel casing is embedded, it is usually necessary to set a circle of support on its outside to facilitate its calibration. For example, the steel casing positioning device disclosed by announcement number CN 219586730 U sets multiple groups of positioning units evenly distributed along the circumference on the inner side of the support, and adjusts the extension length of the positioning wheel by the screw to change the position and verticality of the steel casing. However, in actual application, due to the self-locking function of the screw, when one side of the positioning wheel contacts the steel casing, the opposite side positioning wheel cannot be adjusted to move inward. The operator needs to repeatedly adjust the positioning wheels on both sides back and forth to accurately position the steel casing, and the positioning efficiency is low. Utility Model Content

[0003] In view of the above situation, in order to overcome the defects of the prior art, the utility model adopts a steel casing positioning device, which solves the problem that the steel casing positioning device in the prior art needs to be repeatedly adjusted on both sides.

[0004] The technical solution is to provide a steel casing positioning device, including a support frame, on which are arranged a plurality of upper and lower positioning components evenly distributed along the circumference; the positioning component comprises a cylindrical shell, the axis of the shell is horizontally oriented toward the middle of the support frame, a first piston block which can move along the axis of the shell is arranged at the inner side end of each shell cavity, a support rod is fixed at the inner side end of the first piston block, and a positioning wheel is arranged on the support rod; a second piston block which can move along the axis of the shell is arranged at the outer side end of each shell cavity, a screw is fixed at the outer end of the second piston block, the screw passes through the outer end surface of the shell and is threadedly matched with the outer end surface of the shell, a first ventilation hole and a second ventilation hole which pass through the inside and outside of the shell are arranged between the first piston block and the second piston block, a one-way valve is arranged in the first ventilation hole, and the one-way valve can only intake air into the shell in one direction, a ventilation pipe is fixed at the outer end of the second ventilation hole, the other end of the ventilation pipe is connected to a buffer chamber, a third piston block is arranged in the buffer chamber, the third piston block can move along the buffer chamber and a spring is connected between the third piston block and the buffer chamber.

[0005] A ball valve is arranged in the middle of the ventilation pipe, and the ventilation pipe can be opened or closed by rotating the ball valve.

[0006] The outer edges of the first piston block, the second piston block and the third piston block are all provided with rubber sealing layers and are respectively tightly fitted with the housing and the inner wall of the buffer cavity. The two bottom surfaces of the housing and the outer end of the buffer cavity are respectively provided with air holes.

[0007] The first ventilation hole is a rectangular hole, and a rectangular baffle is hinged in the first ventilation hole. The rectangular baffle is perpendicular to the axis of the first ventilation hole so that it can block the first ventilation hole. A baffle is fixed on the inner wall of the first ventilation hole at the outer end of the baffle hinge axis. The baffle can prevent the baffle from swinging outward in a direction perpendicular to the axis of the first ventilation hole.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] 1. By improving the existing steel casing positioning assembly, the positioning wheel is not restricted by the fixed position of the screw, and the horizontal offset of the steel casing caused by the adjustment of the opposite side positioning assembly is made to make way through the buffer chamber. Only one side positioning assembly needs to be adjusted, and the operator does not need to adjust back and forth, which greatly improves the adjustment and positioning efficiency;

[0010] 2. The one-way valve structure composed of the baffle plate and the baffle block can enable the first piston block and the positioning wheel to quickly move to the inner side end to contact the outer edge of the steel casing, which is convenient for the subsequent adjustment of the horizontal offset of the steel casing. At the same time, the three piston blocks can be reset by pressing the baffle plate inward. The operation is simple, the baffle can be reused, and the practicality is strong.

[0011] 3. The expansion and contraction of the first piston block is controlled by the air cavity, which can achieve rapid positioning compared with the traditional bolt control of the expansion and contraction amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the front view of the positioning component of the utility model.

[0013] Figure 2 This is a front sectional view of the positioning assembly of the utility model.

[0014] Figure 3 for Figure 2 A is an enlarged view of the middle image.

[0015] Figure 4 It is a top sectional view of the utility model. DETAILED DESCRIPTION

[0016] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] Depend on Figures 1 to 4The utility model includes a support frame 1, on which multiple groups of positioning components 2 are evenly distributed along the circumference are arranged; the positioning component 2 includes a cylindrical shell 3, the axis of the shell 3 is horizontally facing the middle of the support frame 1, and the inner side end of each shell 3 cavity is provided with a first piston block 4 that can move along the axis of the shell 3, and the inner side end of the first piston block 4 is fixed with a support rod 5, and the support rod is provided with a positioning wheel 6; the outer side end of each shell 3 cavity is provided with a second piston block 7 that can move along the axis of the shell 3, and the outer end of the second piston block 7 is fixed with a screw 8. The screw rod 8 passes through the outer end surface of the shell 1 and is matched with the outer end surface of the shell 1 by a thread. A first ventilation hole 9 and a second ventilation hole 10 are provided between the first piston block 4 and the second piston block 7, which pass through the inside and outside of the shell 3. A one-way valve is provided in the first ventilation hole 9, and the one-way valve can only intake air into the shell 3 in one direction. A ventilation pipe 11 is fixed to the outer end of the second ventilation hole 10, and a buffer chamber 12 is connected to the other end of the ventilation pipe 11. A third piston block 13 is provided in the buffer chamber 12. The third piston block 13 can move along the buffer chamber 12 and is connected to the buffer chamber 12 by a spring.

[0018] A ball valve 14 is disposed in the middle of the ventilation pipe 11 , and the ventilation pipe 11 can be opened or closed by rotating the ball valve 14 .

[0019] The outer edges of the first piston block 4, the second piston block 7 and the third piston block 13 are all provided with rubber sealing layers and are respectively tightly fitted with the housing 3 and the inner wall of the buffer chamber 12. The bottom surfaces of the housing 3 and the outer end of the buffer chamber 12 are respectively provided with air holes 15.

[0020] The first ventilation hole 9 is a rectangular hole, and a rectangular baffle 16 is hinged inside the first ventilation hole 9. The rectangular baffle 16 is perpendicular to the axial direction of the first ventilation hole 9 so as to block the first ventilation hole 9. A stopper 17 is fixed to the inner wall of the first ventilation hole 9 at the outer end of the hinge axis of the baffle 16. The stopper 17 can prevent the baffle 16 from swinging outward in a direction perpendicular to the axis of the first ventilation hole 9.

[0021] When the utility model is used, the support frame 1 is first fixed and installed, and then all the first piston blocks 4 and the second piston blocks 5 are placed at the outermost end of the shell 3, and all the air valves 14 are in an open state. Then, the steel casing is hoisted above the support frame 1 and the steel casing is released downward until the lower end surface of the steel casing exceeds the positioning component 2 on the lower side, and then the positioning component is adjusted: first, the support rod 5 or the positioning wheel 6 is manually pulled inward to make all the positioning wheels 6 contact with the outer edge surface of the steel casing. Since the baffle 16 can freely swing inwardly toward the first ventilation hole 9, during the process of pulling the support rod 5 to move inward, the air flow can enter the shell 3 through the first ventilation hole 9 to make up for the pressure difference. At this time, since the gas cannot be discharged through the first ventilation hole 9, the cavity between the first piston block 4 and the second piston block 7 is only connected to the buffer cavity 12 through the second ventilation hole 10;

[0022] Then, according to the horizontal offset of the steel casing, the ball valve 14 on the positioning assembly 2 away from the side of the positioning axis is closed. At this time, the cavity between the first piston block 4 and the second piston block 7 is completely sealed, and then the screw 8 on the positioning assembly 2 on this side is rotated so that the screw 8 drives the second piston block 7 and the first piston block 4 to synchronously push the steel casing in the direction of the positioning axis to the position where the axis of the steel casing is closest to the positioning axis in this moving direction. During the movement of the steel casing, all the positioning wheels 6 on the opposite side can be squeezed, so that the support rod 5 on the opposite side drives the first piston block 4 to move outward synchronously, and the third piston block 13 on the opposite side can overcome the spring force and move outward along the buffer cavity 12 to achieve buffering; then repeat the above adjustment process to adjust the horizontal movement of the steel casing from multiple directions until the axis of the steel casing coincides with the positioning axis, close all the ball valves 14, and lock the positions of all the positioning wheels 6, that is, complete the adjustment of the positioning assembly, and then continue to release the steel casing downward to ensure accurate burial;

[0023] After the steel casing is buried, the baffle 16 can be manually pressed inward to reset the third piston block 13 under the action of the spring, and the first piston block 5 and the second piston block 7 can be reset to the outermost end of the housing 3, so as to facilitate the next use;

[0024] It is worth mentioning that a scale can be provided on the screw rod 8 to ensure that the extended lengths of the positioning wheels 6 on all positioning assemblies 2 on the same side are consistent during the adjustment process, thereby ensuring the verticality of the steel casing.

[0025] The utility model improves the existing steel casing positioning assembly so that the positioning wheel 6 is not limited by the fixed position of the screw rod 8, and the buffer chamber 12 makes way for the horizontal offset of the steel casing caused by the adjustment of the opposite side positioning assembly 2. Only the single-side positioning assembly needs to be adjusted, and there is no need for the operator to adjust back and forth, which greatly improves the adjustment and positioning efficiency. The one-way valve structure formed by the baffle 16 and the baffle 17 can enable the first piston block 5 and the positioning wheel 6 to move quickly to the inner end to contact the outer edge surface of the steel casing, which is convenient for the subsequent adjustment of the horizontal offset of the steel casing. At the same time, the three piston blocks can be reset by pressing the baffle 16 inward. The utility model is simple to operate, can be reused, and has strong practicality.

Claims

1. A steel casing positioning device, comprising a support frame (1), on which a plurality of upper and lower positioning components (2) evenly distributed along the circumference are arranged; characterized in that: The positioning assembly (2) comprises a cylindrical shell (3), the axis of the shell (3) being horizontally oriented toward the middle of the support frame (1), a first piston block (4) which can move along the axis of the shell (3) is provided at the inner side end of each shell (3) cavity, a support rod (5) is fixed to the inner side end of the first piston block (4), and a positioning wheel (6) is provided on the support rod; a second piston block (7) which can move along the axis of the shell (3) is provided at the outer side end of each shell (3) cavity, a screw rod (8) is fixed to the outer side end of the second piston block (7), and the screw rod (8) passes through the outer end surface of the shell (3) and is connected to the shell (3) ) are threadedly engaged with each other on the outer end surfaces; a first air exchange hole (9) and a second air exchange hole (10) penetrating inside and outside the shell (3) are provided between the first piston block (4) and the second piston block (7); a one-way valve is provided in the first air exchange hole (9); the one-way valve can only allow air to enter the shell (3) in one direction; an air exchange pipe (11) is fixed to the outer end of the second air exchange hole (10); the other end of the air exchange pipe (11) is connected to a buffer chamber (12); a third piston block (13) is provided in the buffer chamber (12); the third piston block (13) can move along the buffer chamber (12) and a spring is connected between the third piston block (13) and the buffer chamber (12).

2. A steel casing positioning device according to claim 1, characterized in that: A ball valve (14) is provided in the middle of the ventilation pipe (11), and the ventilation pipe (11) can be opened or closed by rotating the ball valve (14).

3. A steel casing positioning device according to claim 1, characterized in that: The outer edges of the first piston block (4), the second piston block (7) and the third piston block (13) are all provided with rubber sealing layers and are respectively tightly fitted to the housing (3) and the inner wall of the buffer chamber (12); and air holes (15) are respectively provided on the two bottom surfaces of the housing (3) and the outer end of the buffer chamber (12).

4. A steel casing positioning device according to claim 1, characterized in that: The first ventilation hole (9) is a rectangular hole, and a rectangular baffle (16) is hinged inside the first ventilation hole (9), the rectangular baffle (16) is perpendicular to the axis direction of the first ventilation hole (9) so as to be able to block the first ventilation hole (9), and a stopper (17) is fixed to the inner wall of the first ventilation hole (9) at the outer end of the hinge axis of the baffle (16), and the stopper (17) can prevent the baffle (16) from swinging outward in a direction perpendicular to the axis of the first ventilation hole (9).

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