Annular hoop self-locking connecting device for vertical uplift static load test of prestressed pipe pile

Abstract

The utility model relates to the technical field of prestressed pipe piles, and discloses a prestressed pipe pile vertical anti-pulling static load test annular hoop self-locking connecting device which comprises an annular hoop, a surrounding gap is formed between the inner side wall of the annular hoop and the outer side wall of a prestressed pipe pile, and a plurality of anchoring clamping pieces are inserted into the surrounding gap; two symmetrically arranged attached lugs are arranged on the periphery of the annular hoop; a steel beam is arranged above the prestressed pipe pile, a jack is arranged on the steel beam, and the jack is provided with a piston rod; a top disc steel beam is arranged above the jack, and the top of the piston rod abuts against the top disc steel beam from bottom to top; a force transmission device is arranged between the attached lug and the top plate steel beam, a lower end base plate of the force transmission device abuts against the lower portion of a bottom plate of the attached lug, and an upper end base plate of the force transmission device abuts against the upper portions of the two ends of the top plate steel beam. The piston rod applies upward jacking load to the top disc steel beam, the jacking load is transmitted to the annular hoop through the force transmission device, and the jacking load is transmitted to the prestressed pipe pile through the combined action of the annular hoop and the anchoring clamping piece.

Description

Technical Field

[0001] The utility model patent relates to the technical field of prestressed pipe piles. Specifically, it relates to a ring-shaped hoop self-locking connection device for vertical uplift static load test of prestressed pipe piles. Background Technique

[0002] Due to the advantages of fast construction speed, relatively low comprehensive cost, and convenient on-site management, prestressed pipe piles have been widely used in pile foundation projects. As uplift piles, prestressed pipe piles are also increasingly commonly used.

[0003] After the prestressed pipe piles are fabricated, certain tests or detections are required. Among them, the uplift static load test is a method for testing and detecting the prestressed pipe piles in the project to determine the vertical uplift ultimate bearing capacity of a single prestressed pipe pile, judge whether the vertical uplift static load capacity meets the design requirements, and measure the uplift friction resistance of the pile through the internal force and deformation tests of the prestressed pipe pile.

[0004] In the prior art, the method of using welded extended core filling steel bars for reaction force conduction is adopted in the uplift static load test of prestressed pipe piles. Before the test, it is necessary to reinforce and fill the core in its hollow part on-site. After reaching the age, the core filling steel bars are welded and extended to be fixed in the test reaction force bearing steel plate, and then the jack applies the jacking load to the reaction force bearing steel plate. It is necessary to wait for the age of the core filling concrete, so the on-site preparation time is long and the operation is troublesome. Moreover, during the welding process of the extended steel bars, there are certain safety hazards. At the same time, labor, as well as a certain amount of steel bars and electrode materials, are consumed. If the welding operation is improper, it is easy to have uneven stress or welding detachment at the welding point during the test, resulting in difficulties in carrying out the uplift static load test. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a ring-shaped hoop self-locking connection device for vertical uplift static load test of prestressed pipe piles, aiming to solve the problems of waiting for the concrete age and troublesome operation in the uplift static load test of prestressed pipe piles in the prior art.

[0006] The utility model is realized as follows. The ring-shaped hoop self-locking connection device for vertical uplift static load test of prestressed pipe piles is characterized in that it includes a ring-shaped hoop surrounding the outer periphery of the prestressed pipe pile. There is a surrounding gap between the inner side wall of the ring-shaped hoop and the outer side wall of the prestressed pipe pile. Multiple anchoring clips are inserted into the surrounding gap. The multiple anchoring clips are arranged around the outer periphery of the prestressed pipe pile to anchor the ring-shaped hoop to the prestressed pipe pile. Two symmetrically arranged attachment ears and a percussion anvil are provided on the outer periphery of the ring-shaped hoop.

[0007] A steel beam is provided above the prestressed pipe pile. A jack is provided on the steel beam. The jack has a piston rod. A top plate steel beam is provided above the steel beam. The top of the piston rod abuts against the top plate steel beam from bottom to top.

[0008] A force transmission device is provided between the ear appendage and the top plate steel beam. The lower end of the force transmission device is connected to the ear appendage, and the upper end of the force transmission device is connected to the top plate steel beam; the piston rod applies an upward jacking load to the top plate steel beam, and the jacking load is conducted to the annular hoop through the force transmission device, and the annular hoop then conducts it to the prestressed pipe pile through the anchoring clip.

[0009] Further, the annular hoop has a through cavity that penetrates up and down and is inverted conical from bottom to top.

[0010] Further, the anchoring clip is wedge-shaped. The outer side of the anchoring clip has an outer abutting side wall, and the inner side of the anchoring clip has an inner abutting side wall; the outer abutting side wall is arranged obliquely and abuts against the inner side wall of the ring steel ring of the annular hoop, and the inner abutting side wall abuts against the outer side wall of the prestressed pipe pile.

[0011] Further, the inner abutting side wall of the anchoring clip is provided with sawteeth, and the sawteeth are arranged along the length direction of the inner abutting side wall.

[0012] Further, there is an opening at the upper end of the anchoring clip, and a pull ring is passed through the opening. The pull ring is exposed outside the annular hoop and is used to pull the anchoring clip out of the surrounding gap.

[0013] Further, a steel backing plate is provided at the bottom of the top plate steel beam, and the top of the piston rod of the jack abuts against the bottom of the steel backing plate from bottom to top. There are 4 anti-slip plates below the steel backing plate, and the anti-slip plates are evenly and symmetrically arranged on the four sides of the regular octagon to prevent the piston rod of the jack from slipping.

[0014] Further, the ear appendage has a bottom plate that abuts against the outer side wall of the annular hoop. An opening groove is provided in the bottom plate. The lower end of the high-strength pull rod of the force transmission device is clamped into the opening groove. The lower end of the high-strength pull rod is connected with a backing plate and a high-strength nut. The backing plate abuts against the lower part of the bottom plate from bottom to top, and the high-strength nut relatively fixes the high-strength pull rod and the bottom plate.

[0015] Further, openings are provided at both ends of the top plate steel beam, and steel bars are inserted into the openings to prevent the force transmission device from slipping off. The upper end of the high-strength pull rod of the force transmission device is connected with a backing plate and a high-strength nut. The backing plate abuts against the top plate steel beam from top to bottom, and the high-strength nut relatively fixes the high-strength pull rod and the top plate steel beam.

[0016] Furthermore, side plates are provided on both sides of the lug. The inner ends of the side plates are butted against the outer side wall of the annular hoop ring steel ring, and the lower ends are correspondingly butted against the upper parts on both sides of the bottom plate. There are openings on the outer side of the upper part of the side plates for hoisting the main body of the device. After hoisting, steel bars can be inserted to prevent the force transmission member from slipping off. Two reinforcing plates are connected to the bottom plate, arranged on both sides of the opening groove of the bottom plate, and the bottom is butted against the upper parts on both sides of the opening groove of the bottom plate. The inner sides of the reinforcing plates are butted against the outer side wall of the annular hoop ring steel ring.

[0017] Furthermore, a limiting plate is provided at the bottom of the bottom plate of the lug to prevent the force transmission device from slipping off.

[0018] Compared with the prior art, the prestressed pipe pile vertical uplift static load test annular hoop self-locking connection device provided by the present utility model arranges an annular hoop on the outer periphery of the prestressed pipe pile, anchors the annular hoop and the prestressed pipe pile by using a plurality of anchoring clips, connects a force transmission device between the annular hoop and the top plate steel beam, and applies a jacking load to the top plate steel beam by the piston rod of the jack, so as to form an uplift on the prestressed pipe pile and form an uplift force transmission system. The operation is simple and there is no need to wait for the concrete age and extend the steel bars, etc. Description of the Drawings

[0019] Figure 1 is the front view schematic diagram of the prestressed pipe pile vertical uplift static load test annular hoop self-locking connection device provided by the present utility model;

[0020] Figure 2 is the side view schematic diagram of the prestressed pipe pile vertical uplift static load test annular hoop self-locking connection device provided by the present utility model;

[0021] Figure 3 is the front view schematic diagram of the anchoring clip provided by the present utility model. Detailed Embodiment

[0022] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] The implementation of the present utility model will be described in detail below with reference to specific embodiments.

[0024] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Referring to Figures 1-3 as shown, it is a preferred embodiment provided by the present utility model.

[0026] In this embodiment, it is applicable to the ring-shaped hoop self-locking connection device 10 for the vertical uplift static load test of prestressed pipe piles, which includes a ring-shaped hoop 11, anchor clips 12, a top plate steel beam 13 and a force transmission device 14.

[0027] In this embodiment, the ring-shaped hoop 11 includes a ring steel ring 111 surrounding the outer periphery of the prestressed pipe pile, attachment ears 112 symmetrically arranged on the outer periphery of the ring steel ring, and a percussion anvil 113 (the symmetric arrangement direction of the percussion anvil is perpendicular to the symmetric arrangement direction of the attachment ears). The attachment ear 112 includes a bottom plate 1121, a side plate 1122 above the bottom plate, a reinforcing plate 1123 above the bottom plate, and a limiting plate 1124 below the bottom plate. The percussion anvil 113 includes a panel 1131 and a reinforcing plate 1132 below.

[0028] In this embodiment, a plurality of anchor clips 12 are included, which are inserted into the gap between the inner side wall of the ring steel ring 111 of the ring-shaped hoop and the outer side wall of the prestressed pipe pile 21, and are arranged around the outer periphery of the prestressed pipe pile 21 to form an anchoring structure between the ring-shaped hoop 11 and the prestressed pipe pile 21.

[0029] In this embodiment, the top plate steel beam 13 includes 2 steel beams 131 (the 2 steel beams are parallel to each other). There are 2 lifting holes 135 at each end of the top plate steel beam 13. After installation, steel bars 151 can be inserted into the lifting holes to reduce the relative slip between the two top plate steel beams and prevent the force transmission device 14 from slipping off the two ends of the top plate steel beam. There is 1 steel backing plate 132 at the central position of the lower part of the 2 steel beams, and there are 4 anti-slip plates 134 below the steel backing plate (the 4 anti-slip plates 134 are evenly and symmetrically arranged on the four sides of a regular octagon). There is 1 reinforcing plate 133 at the central position of the upper part of the 2 steel beams.

[0030] In this embodiment, the force transmission device 14 includes high-strength tie rods 141, backing plates 142 and high-strength nuts 143, which conduct force between the ring-shaped hoop and the top plate steel beam.

[0031] In this embodiment, the ring steel ring 111 of the annular hoop is in the shape of an inverted frustum with a smaller bottom and a larger top. The wall thickness is the same around the perimeter, and there is a cavity that runs through from top to bottom in the middle. The inner sidewall forms a surrounding gap with the outer sidewall of the prestressed pipe pile 21 inserted therein, and the longitudinal section of the surrounding gap also forms a shape with a smaller bottom and a larger top.

[0032] In this embodiment, attachment ears 112 are symmetrically arranged on the outer periphery of the ring steel ring of the annular hoop. The inner end of the bottom plate 1121 is connected to the outer sidewall of the ring steel ring 111. There is an opening groove in the middle of the outer side of the bottom plate 1121 (the length of the opening groove is slightly longer than the center of the bottom plate, and the width is slightly larger than the diameter of the high-strength tie rod for the insertion of the high-strength tie rod). Two trapezoidal side plates 1122 are arranged on the upper sides of both sides of the bottom plate 1121. The lower ends are correspondingly connected to the upper sides of both sides of the bottom plate 1121, and the inner ends are correspondingly connected to the outer sidewall of the ring steel ring 111. There are openings on the outer sides of the upper parts of the two side plates 1122 (for hoisting the main body of the device, and after hoisting, steel bars 152 can be inserted to prevent the force transmission device 14 from slipping). Two triangular reinforcing plates 1123 are arranged on the upper sides of both sides of the opening groove of the bottom plate. The lower ends are correspondingly connected to the upper sides of both sides of the middle opening groove of the bottom plate 1121, and the inner ends are correspondingly connected to the outer sidewall of the ring steel ring 111. During the process of transmitting the tensile force, the two side plates and the two reinforcing plates work together to avoid deformation of the bottom plate 1121 and enhance the stability of the attachment ear 112. Two rectangular limiting plates 1124 are arranged on the lower sides of both sides of the opening groove of the bottom plate 1121. The upper ends are correspondingly connected to the lower parts of the outer sides of the bottom plate 1121. During the process of transmitting the tensile force, the two limiting plates 1124 can prevent the sliding plate 142 at the lower part of the force transmission device 14 from sliding and falling off.

[0033] In this embodiment, percussion anvils 113 are symmetrically arranged on the outer periphery of the ring steel ring 111 of the annular hoop (the symmetric arrangement direction of the percussion anvils is perpendicular to the symmetric arrangement direction of the attachment ears). The inner end of the panel 1131 is connected to the outer sidewall of the ring steel ring 111 of the annular hoop. A triangular reinforcing plate is arranged at the middle position of the lower part of the panel, and the upper end of the reinforcing plate is connected to the lower part of the middle of the panel.

[0034] In this embodiment, the anchoring clip 12 is wedge-shaped and has the same shape as the longitudinal section of the surrounding gap between the inner sidewall of the ring steel ring 111 of the annular hoop and the outer sidewall of the prestressed pipe pile 21. It is inserted into the gap between the inner sidewall of the ring steel ring 111 of the annular hoop and the outer sidewall of the prestressed pipe pile 21 and arranged in multiple pieces along the outer sidewall of the prestressed pipe pile. When the annular hoop 11 is subjected to an upward tensile force, multiple wedge-shaped anchoring clips together form a greater frictional force on the outer sidewall of the prestressed pipe pile, thereby making the anchoring of the annular hoop 11 and the prestressed pipe pile 21 more stable.

[0035] In this embodiment, the outer side of the anchoring wedge 12 has an outer abutting side wall 121, which is arranged obliquely and is used to abut against the inner side wall of the annular hoop ring steel ring 111. The inner side has an inner abutting side wall 122, which is arranged vertically and is used to abut against the outer side wall of the prestressed pipe pile 21. The inner abutting side wall 122 is provided with saw teeth 123, which are arranged along the length direction. In this way, the abutting and clamping between the anchoring wedge 12 and the prestressed pipe pile 21 can be more stable.

[0036] In this embodiment, there is an opening 124 at the upper end of the anchoring wedge 12. A pull ring 125 passes through the opening 124 and is exposed outside the annular hoop 11. When it is necessary to disassemble the anchoring wedge 12 from the surrounding gap, the anchoring wedge 12 can be pulled through the pull ring 125, which is convenient for operation.

[0037] In this embodiment, the force transmission device 14 includes a high-strength tie rod 141 (with threads provided at both ends), a backing plate 142 (with a through hole provided in the middle, and the hole diameter is slightly larger than the diameter of the high-strength tie rod), and a high-strength nut 143. The upper and lower ends of the high-strength tie rod pass through the backing plate 142, and the high-strength tie rod 141 and the backing plate 142 are relatively fixed by the high-strength nut 143.

[0038] In actual detection applications, the annular hoop 11 is hoisted and sleeved on the prestressed pipe pile 21 that needs to be subjected to the uplift static load test. A plurality of anchoring wedges 12 are inserted into the gap between the inner side wall of the annular hoop ring steel ring 111 and the outer side wall of the prestressed pipe pile 21, and are evenly arranged along the outer side wall of the prestressed pipe pile. Then, two abutments 22 are arranged on both sides of the prestressed pipe pile 21, and a steel beam 23 is arranged directly above. The two ends of the steel beam 23 are arranged on the abutments 22. A jack 24 is placed above the center position of the steel beam 23. There is a piston rod 25 above the jack 24. A top plate steel beam 13 is placed above the piston rod 25 (when the top plate steel beam is placed, the piston rod 25 is located at the center of the top plate steel beam and at the center of the four anti-disengagement plates 134, and the direction of the top plate steel beam is consistent with the symmetric direction of the lug 112 of the annular hoop). Two sets of force transmission devices 14 are symmetrically arranged between the two ends of the top plate steel beam 13 and the lugs 112 of the annular hoop 11. The upper backing plate 142 abuts against the upper parts of the two ends of the top plate steel beam 13, and the lower backing plate abuts against the lower part of the bottom plate 1121 of the lug of the annular hoop, so as to form a relatively fixed force transmission structure between the annular hoop 11 and the top plate steel beam 13.

[0039] In actual detection applications, the piston rod 24 of the jack applies an upward lifting load. Through the top plate steel beam 13 and the force transmission devices 14 arranged at both ends, the lifting load is transmitted to the lugs 112 on the outer circumference of the annular hoop 11 and then to the annular hoop 11. Then, a plurality of anchoring wedges 12 arranged around the prestressed pipe pile are used to transmit the lifting load to the prestressed pipe pile 21, causing uplift of the prestressed pipe pile 21, thereby completing the uplift static load test of the prestressed pipe pile 21.

[0040] In actual detection applications, when detection is required, the above-provided ring hoop self-locking connection device 10 for vertical uplift static load test of prestressed pipe piles anchors the ring hoop 11 to the prestressed pipe pile 21 through the anchoring clip 12, connects the force transmission device between the ring hoop 11 and the top plate steel beam 13, applies a jacking load to the top plate steel beam 13 by the piston rod 25 of the jack, and then uplifts the prestressed pipe pile 21 to form an uplift force conduction system to complete the detection. After the detection is completed, the percussion anvil 113 on the outer periphery of the ring hoop 11 is struck by an external tool to cause the ring hoop 11 to slide down, so as to disengage from the prestressed pipe pile 21 and disconnect the anchoring. The above operations are simple and do not require pouring concrete, waiting for the concrete age, splicing steel bars, etc.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The annular clamp self-locking connection device for the vertical pull-out static load test of prestressed pipe piles is characterized by: It comprises an annular hoop surrounding the outer circumference of the prestressed pipe pile, wherein there is an encircling gap between the inner side wall of the annular hoop and the outer side wall of the prestressed pipe pile, wherein a plurality of anchoring clips are inserted into the encircling gap, and the plurality of anchoring clips are arranged around the outer circumference of the prestressed pipe pile to anchor the annular hoop and the prestressed pipe pile; the outer circumference of the annular hoop is provided with two symmetrically arranged attachment ears and a striking anvil; A steel beam is arranged above the prestressed pipe pile, a jack is arranged on the steel beam, and the jack has a piston rod; a top plate steel beam is arranged above the steel beam, and the top of the piston rod abuts against the top plate steel beam from bottom to top; A force transmission device is provided between the attached ear and the top plate steel beam, the lower end of the force transmission device is connected to the attached ear, and the upper end of the force transmission device is connected to the top plate steel beam; the piston rod applies an upward lifting load to the top plate steel beam, and the lifting load is transmitted to the annular hoop through the force transmission device, and the annular hoop then transmits it to the prestressed pipe pile through the anchor clip.

2. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles as claimed in claim 1, characterized in that: The annular hoop has a through cavity which passes through from top to bottom and is in an inverted cone shape from bottom to top.

3. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles as claimed in claim 1 or 2, characterized in that: The anchoring clip is wedge-shaped, with an outer side wall on the outer side of the anchoring clip and an inner side wall on the inner side of the anchoring clip; the outer side wall is inclined and abuts against the inner side wall of the steel ring of the annular hoop, and the inner side wall abuts against the outer side wall of the prestressed pipe pile.

4. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles as claimed in claim 3 is characterized in that: The inner side wall of the anchoring clip is provided with saw teeth, and the saw teeth are arranged along the length direction of the inner side wall.

5. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 1 or 2, characterized in that: An opening is provided at the upper end of the anchoring clip, and a handle ring is passed through the opening. The handle ring is exposed outside the annular clamp and is used to pull the anchoring clip out of the surrounding gap.

6. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 1 or 2, characterized in that: A steel pad is provided at the bottom of the top plate steel beam, and the top of the jack piston rod abuts against the bottom of the steel pad from bottom to top. Four anti-slip plates are provided under the steel pad, and the anti-slip plates are evenly and symmetrically arranged on the four sides of the regular octagon to prevent the jack piston rod from slipping.

7. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 1 or 2, characterized in that: The attached ear has a bottom plate butt-jointed to the outer side wall of the annular clamp, an open groove is provided in the bottom plate, the lower end of the high-strength pull rod of the force transmission device is inserted into the open groove, a pad and a high-strength nut are connected to the lower end of the high-strength pull rod, the pad abuts against the lower part of the bottom plate from bottom to top, and the high-strength nut fixes the high-strength pull rod relative to the bottom plate.

8. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 1 or 2, characterized in that: Openings are provided at both ends of the top plate steel beam, and steel bars are inserted into the openings to prevent the force transmission device from slipping. The upper end of the high-strength pull rod of the force transmission device is connected with a pad and a high-strength nut. The pad abuts against the top plate steel beam from top to bottom, and the high-strength nut fixes the high-strength pull rod and the top plate steel beam relatively.

9. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 7, characterized in that: Side plates are provided on both sides of the attached ears, the inner ends of the side plates are butt-jointed with the outer side walls of the annular hoop ring steel ring, and the lower ends are correspondingly butt-jointed with the upper parts of both sides of the bottom plate; the upper part of the side plates is provided with openings on the outer sides for hoisting the main body of the device, and after the hoisting is completed, steel bars can be inserted to prevent the force transmission components from slipping off; two reinforcing plates are connected to the bottom plate, which are arranged on both sides of the opening groove of the bottom plate, and the bottom is butt-jointed with the upper parts of both sides of the opening groove of the bottom plate, and the inner side of the reinforcing plates is butt-jointed with the outer side walls of the annular hoop ring steel ring.

10. The annular clamp self-locking connection device for vertical pull-out static load test of prestressed pipe piles according to claim 9, characterized in that: A limiting plate is provided at the bottom of the ear-attached bottom plate to prevent the force transmission device from slipping off.

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