Non-metal anti-floating anchor bearing performance test system

Abstract

The utility model relates to the technical field of geotechnical engineering test equipment, in particular to a nonmetal anti-floating anchor bearing performance test system which comprises buttresses surrounding a test well, the top ends of the buttresses are connected with a cross beam, the cross beam is provided with a center hole jack, the center hole jack is connected with the top end of a dowel bar, and the bottom end of the dowel bar is connected with a cushion block. The cushion block is provided with a plurality of uniformly arranged hole sites, each hole site is connected with a sleeve, and the interior of each sleeve is bonded and fixed with a corresponding anchor rod to be tested. In consideration of the problem that the shear strength of the glass fiber anti-floating anchor rod is relatively weak, the sleeves and the anchor rod to be tested are bonded and fixed, meanwhile, the sleeves and the cushion block are connected and fixed, and the jack drives the cushion block through the dowel bar to ascend together with the sleeves and the anchor rod on the cushion block, so that the pull-out test is realized; the bearing capacity test is carried out in the state that the anchor rod is protected, the anchor rod is prevented from being damaged in the test period, and the shear stress borne by the anchor rod in the test period is reduced as much as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of non-metal anti-floating anchor rod bearing performance test system in geotechnical engineering test equipment technical field. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute prior art.

[0003] Anti-floating anchor rod is an engineering measure for preventing underground structures from floating due to groundwater buoyancy, and is widely used in underground construction, tunnels, basements and other projects. Generally, metal materials (e.g., steel bars) are used as common anchor rod materials, but steel bars are prone to corrosion. Related investigations show that more than 50% of anti-floating anchor rods have prematurely retired due to corrosion problems.

[0004] To solve the corrosion problem, existing technologies have emerged glass fiber anchor rods, such as GFRP anchor rods (Glass Fiber Reinforced Polymer), which have excellent properties such as high strength, light weight and corrosion resistance.

[0005] In practical applications, the pullout performance of anti-floating anchor rods needs to be tested to ensure the bearing capacity of anti-floating anchor rods. Traditional anti-floating anchor rods are made of metal materials, and the connection method with the test system is usually welding or special anchor. However, welding operation takes a long time and is difficult. GFRP anchor rods are non-metallic materials and cannot be welded directly. They are usually connected to the test system through punching and other methods. This method is destructive to the structure of GFRP anchor rods, affecting the test results on the one hand, and on the other hand, the GFRP anchor rods after testing cannot be reused in engineering due to structural damage and deformation, causing waste.

[0006] Currently, there are many technologies for connecting anchor rod bodies in anti-floating anchor rod pullout test systems. For example, CN108018890 discloses an anchor rod pullout test system, but does not involve glass fiber anti-floating anchor rods. Due to the difference in mechanical properties between glass fiber and steel bar, the steel bar anchor rod pullout test system cannot be completely copied. CN105699192 discloses a glass fiber anti-floating anchor rod pullout test system that uses an anchoring clamp to connect the anti-floating anchor rod, but only considers the case of a single anchor rod. The situation of multiple anchor rods under stress has not been addressed.

[0007] The above methods provide new connection methods for anchor rod bodies and test devices. However, GFRP anchor rods have relatively weak shear resistance. These methods do not consider the relatively weak shear strength of glass fiber anti-floating anchor rods, which makes existing test systems unable to be applied in multi-glass fiber anti-floating anchor rod bearing tests. Utility Model Content

[0008] To address the technical problems mentioned above, this invention provides a non-metallic anti-buoyancy anchor bearing capacity testing system. Considering the relatively weak shear strength of glass fiber anti-buoyancy anchors, a sleeve is used to bond and fix the anchor to be tested. Simultaneously, the sleeve is also connected and fixed to a pad. A jack, through a force transmission rod, drives the pad, along with multiple sleeves on the pad and the anchor, to rise together, achieving a pull-out test. The bearing capacity test is conducted while the anchor is protected, avoiding damage to the anchor during the test and minimizing the shear stress borne by the anchor during the test.

[0009] To achieve the above objectives, the present invention adopts the following technical embodiments:

[0010] This utility model provides a non-metallic anti-buoyancy anchor bearing performance test system, including a support pier surrounding the test well, a crossbeam connected to the top of the support pier, a through-type jack on the crossbeam, the through-type jack connected to the top of a force transmission rod, a pad connected to the bottom of the force transmission rod, a plurality of evenly arranged holes on the pad, a sleeve connected to each hole, and the inside of each sleeve is bonded and fixed to the corresponding anchor to be tested.

[0011] Furthermore, the upper surface of the crossbeam is connected to a through-type jack via a through-type steel plate.

[0012] Furthermore, the pad is located in the space below the crossbeam.

[0013] Furthermore, the pad block has an internal thread inside the pit located at the center of the circle, and the bottom of the force transmission rod has a matching external thread. After the force transmission rod extends into the pit, it is connected by the thread.

[0014] Furthermore, the holes in the pad are arranged in multiple sets evenly along the circumference of the pad, with the center of the pad as the center point.

[0015] Furthermore, the holes in the pad have internal threads, and the sleeve has matching external threads. After the sleeve is inserted into the holes in the pad, it is initially fixed by the threaded connection.

[0016] Furthermore, the external threaded portion of the sleeve protruding from the upper and lower surfaces of the pad is secured a second time by a nut.

[0017] Furthermore, the anchor bolt to be tested is fixed inside the sleeve by adhesive bonding.

[0018] Furthermore, the test well contains concrete poured according to the test requirements to fix the lower end area of ​​the anchor bolt.

[0019] Further, the oil pump is used to drive the action of the through core jack, drive the force transmission rod to drive the pad to rise together with the sleeve and the anchor rod, and the anti-floating bearing capacity of the anchor rod is determined through the displacement data of the rising of the anchor rod.

[0020] Further, the displacement meter is connected with the anchor rod to be tested, and is used to acquire the displacement data during the test.

[0021] Compared with the prior art, the above one or more technical embodiments have the following beneficial effects:

[0022] 1. During the test, the sleeve is fixed outside the anchor rod, forming the first protection of the anchor rod during the test, the pad is fixed outside the sleeve, and the second protection of all the anchor rods participating in the test is performed, the shear stress borne by the anchor rod is shared by the sleeve and the pad, so that the shear stress transmitted to the anchor rod is as small as possible, the problem that the shear strength of the anchor rod of non-metallic material is relatively weak is fully considered, damage of the anchor rod of non-metallic material due to the relatively weak shear strength during the test is avoided, so that the anchor rod after the test can be repeatedly applied in engineering, and waste is reduced.

[0023] 2. By adding the pad, the test of multiple anchor rods can be performed at one time, and the multiple anchor rods are stressed more uniformly under the force transmission of the pad structure, and the problem that the test result is inaccurate due to the unbalanced tension between the multiple anchor rods is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings constituting a part of the specification of the present utility model are used to provide a further understanding of the present utility model, and the illustrative embodiments of the present utility model and the description thereof are used to explain the present utility model, and do not constitute an improper limitation on the present utility model.

[0025] Fig. 1 The test system main body structure schematic view provided by the present utility model is shown in the figure.

[0026] Fig. 2 The test system side structure schematic view provided by the present utility model is shown in the figure.

[0027] Fig. 3 The pad structure schematic view in the test system provided by the present utility model is shown in the figure.

[0028] In the figure: 1, pier; 2, I-beam; 3, through steel plate; 4, through core jack; 5, anchor rod; 6, sleeve; 7, pad; 8, force transmission rod; 9, nut; 10, jack nut; 11, oil pump; 12, displacement meter. DETAILED DESCRIPTION

[0029] The present utility model will be further described below in combination with the drawings and embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0031] A non-metal anti-floating anchor rod bearing performance test system, comprising a support pier 1 enclosed around the test well, the top end of the support pier 1 is connected to a cross beam, the cross beam can be an I-beam 2, the upper surface of the cross beam is connected to a through steel plate 3, the through steel plate 3 is connected to a through jack 4, the through jack 4 is connected to the top end of a force transmission rod 8, the bottom end of the force transmission rod 8 is connected to a cushion block 7, the cushion block 7 is provided with a plurality of uniformly arranged hole positions, each hole position is connected to a sleeve 6, and each sleeve 6 is connected to a corresponding anchor rod to be tested, and the exposed anchor rod area below the sleeve 6 is connected to a displacement meter 12.

[0032] The oil pump 11 drives the through jack 4 to act, drives the force transmission rod 8 to drive the cushion block 7 to rise or fall, and the test well is poured with concrete according to the test requirements to fix the lower end of the anchor rod 5, when the cushion block 7 drives the sleeve 6 together with the anchor rod 5 to rise, the parameters of the displacement meter 12 are obtained, and the anti-floating bearing capacity of the anchor rod 5 is calculated according to the existing anchor rod anti-pulling test specification.

[0033] The hole positions in the cushion block 7 are uniformly arranged in multiple groups along the circumferential direction of the cushion block 7 with the center of the cushion block 7 as the center point, so as to ensure that the multiple anchor rods 5 are uniformly stressed.

[0034] The hole positions in the cushion block 7 have internal threads, the sleeve 6 has external threads engaged with the internal threads, after the sleeve 6 is inserted into the hole position in the cushion block 7, the sleeve 6 is preliminarily fixed through thread connection, the part of the sleeve 6 exposed on the upper surface and the lower bottom surface of the cushion block 7 is secondarily fixed through a nut 9, so as to ensure that the sleeve 6 and the cushion block 7 are connected to form an integral whole, thereby having reliable force transmission effect.

[0035] The anchor rod 5 to be tested is made of non-metal material and is fixedly connected to the inner wall of the sleeve 6 through bonding, so as not to damage the structure of the anchor rod 5. The inner wall of the sleeve 6 can be processed with specific patterns or structures to improve the bonding strength.

[0036] During the test, the force transmission rod 8 is used to transmit the pulling force generated by the through jack 4 to the cushion block 7, the cushion block 7 uniformly transmits the received pulling force to each sleeve 6, and the sleeve 6 transmits the received pulling force to the respective internally fixed anchor rod 5, so as to realize the anti-pulling test, i.e. the bearing capacity test. The sleeve 6 is fixed outside the anchor rod 5 to form the first protection of the anchor rod 5 during the test, and the cushion block 7 is fixed outside the sleeve 6 to perform the second protection on all the anchor rods 5 participating in the test, so as to avoid damage to the non-metal anchor rod 5 during the test.

[0037] In the embodiment, as shown in Figs. 1-3As shown, the test system comprises: a pier 1, an I-beam 2, a through steel plate 3, a through jack 4, an anchor rod 5, a sleeve 6, a cushion block 7, a force transmission rod 8, a nut 9, a jack nut 10, an oil pump 11 and a displacement meter 12.

[0038] During erection, the pier 1 is first installed, then the steel beam 2 made of I-beam is erected on the pier 1, and then the through jack 4 is erected on the steel beam 2. The upper end of the force transmission rod 8 passes through the through steel plate 3 and the piston in the through jack 4, and is fixed by the nut 10. The lower part of the force transmission rod 8 is provided with the cushion block 7, and the hole of the sleeve 6 is arranged in the cushion block 7. The upper part of the sleeve 6 is externally threaded, and the sleeve 6 and the cushion block 7 can be fixed together by the nut 9. After being fixed, the anchor rod 5 and the sleeve 6 are bonded together by resin glue. The displacement meter 12 is designed below the anchor rod 5.

[0039] When the operation starts, the through jack 4 is driven by the oil pump 11. When the piston in the through jack 4 moves upward, the through jack 4 will drive the force transmission rod 8 to lift upward due to the action of the nut 10. The force transmission rod 8 will transmit the upward pulling force to the cushion block 7 through the anchoring effect of the thread. Since the anchor rod 5 and the sleeve 6 are bonded together by the resin glue, and the cushion block 7 and the sleeve 6 are fixed by the nut, an integral whole is formed. The cushion block 7 will transmit the force to the anchor rod 5 through the sleeve 6 in the axial direction, so as to apply a controllable axial pulling force to one or more anchor rods 5. During the whole process, the displacement meter 12 is used to monitor the displacement change of the anchor rod 5 in real time. For specific test details, refer to the relevant anchor rod test specification.

[0040] The pier 1 is a steel pier with a length of 1.0 m, a width of 0.7 m and a height of 0.4 m, which can provide a stable counterforce support. When the anchor rod is stretched, the I-beam 2 can transmit the counterforce generated to the pier 1.

[0041] The I-beam 2 has a cross-sectional height of 320 mm, a flange width of 130 mm, a flange thickness of 15 mm and a web thickness of 9.5 mm.

[0042] The through steel plate 3 has a thickness of not less than 20 mm and a central hole diameter of 40 mm. The through steel plate 3 can transmit the pulling force received by the anchor rod to the I-beam 2, and can also provide vertical support for the force transmission rod 8.

[0043] The through jack 4 is a key device for applying pulling force. The body has a height of 165 mm, a through hole diameter of 40 mm and a cylinder outer diameter of 80 mm.

[0044] The anchor rod 5 is made of glass fiber material and has a diameter of 25 mm, which is a core force component. In the system, the anchor rod 5 passes through the sleeve 6 and is bonded together with the sleeve 6 by epoxy resin glue.

[0045] The sleeve 6 is a steel sleeve with an inner diameter greater than 25 mm, a wall thickness not less than 5 mm and a hollow middle part.

[0046] The cushion block 7 is a solid steel block with a thickness of 15 cm and a diameter of 60 mm. Fig. 3 As shown in the figure, a pit with a diameter greater than 36 mm is reserved in the middle part for passing through the force transmission rod 8, and the inner side of the pit is threaded. Three holes with a diameter greater than 25 mm are reserved on the outer side for passing through the sleeve 6, and the sleeve 6 and the force transmission rod 8 are connected together through the cushion block 7.

[0047] The force transmission rod 8 is made of steel with a diameter of 36 mm, and the upper part of the force transmission rod passes through the through steel plate 3 and the through jack 4 and is fixed and locked by the nut 10. The lower part is externally threaded and fixed together with the internal thread of the cushion block 7. The force transmission rod 8 can transmit the pulling force applied by the jack 4 to the cushion block 7 to drive the anchor rod 5 to be pulled.

[0048] The displacement meter 12 is connected with the anchor rod and is mainly used for accurately measuring the displacement of the anchor rod 5 when the anchor rod 5 is subjected to the pulling force.

[0049] The lower end of the force transmission rod 8 is provided with the cushion block 7, the cushion block 7 is provided with a hole through which the sleeve 6 passes, and the nut 9 is matched to lock the sleeve 6 passing through. The anchor rod 5 passes through the sleeve 6 and is bonded together by resin glue. The system transmits force by the cushion block 7 to avoid direct contact between the force transmission rod 8 and the anchor rod 5.

[0050] The system has the advantages of simple structure, convenient installation, easy disassembly, reusability, reduced test cost to a certain extent and improved test efficiency. The system can connect the anchor rod and the cushion block through the sleeve, ensure the axial stress of the anchor rod, avoid the direct contact between the force transmission rod and the anchor rod, greatly reduce the contingency of the test and improve the accuracy of the test results. Moreover, the test system can perform anchor rod pull-out tests on multiple rod bodies in one hole, and the uniform stress of each anchor rod can be ensured by adjusting the nut. Compared with the traditional connection mode, the system will not cause irreversible damage to the anchor rod. Moreover, the device can be recycled.

[0051] The above is only a preferred embodiment of the utility model and is not used for limiting the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A test system for the bearing capacity of a non-metallic anti-buoyancy anchor, characterized in that, It includes a support pier surrounding the test well, a crossbeam connected to the top of the support pier, a through-type jack on the crossbeam, the top of the through-type jack connected to the force transmission rod, a pad connected to the bottom of the force transmission rod, and multiple evenly arranged holes on the pad, with a sleeve connected to each hole, and each sleeve being bonded and fixed to the corresponding anchor rod to be tested inside.

2. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The upper surface of the crossbeam is connected to the through-hole jack via a through-hole steel plate.

3. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The spacer block is located in the space below the crossbeam.

4. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The holes in the pad are arranged in multiple sets evenly along the circumference of the pad, with the center of the pad as the center point.

5. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The holes in the pad have internal threads, and the sleeve has matching external threads. After the sleeve is inserted into the holes in the pad, it is initially fixed by the threaded connection.

6. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The external threaded portion of the sleeve protruding from the upper and lower surfaces of the pad is secured a second time by a nut.

7. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The anchor bolt to be tested is fixed inside the sleeve by adhesive bonding.

8. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, The test well contains concrete poured according to the test requirements to fix the lower end area of ​​the anchor bolt.

9. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, It also has an oil pump to drive the through-hole jack, which drives the force transmission rod to lift the pad, sleeve and anchor rod together. The displacement data of the rising anchor rod is used to determine the anti-buoyancy bearing capacity of the anchor rod.

10. The non-metallic anti-buoyancy anchor bearing capacity test system according to claim 1, characterized in that, It also has a displacement gauge, which is connected to the anchor rod under test to obtain displacement data during the test.

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