Single-pile vertical compression resistance static load test loading device

Abstract

The utility model provides a single-pile vertical compression resistance static load test loading device, which comprises a rigid beam, two groups of pull stand column assemblies, a test pile, a fixed plate, an anchor rod, a telescopic table and a jack, each group of pull stand column assembly comprises two pull stand columns, the two pull stand columns are respectively arranged on the left side and the right side of the rigid beam, and the test pile is arranged on the fixed plate. An upper bottom plate and a lower bottom plate are fixed between the two pulling stand columns through large nuts, a rigid beam is installed between the two pulling stand column assemblies, a fixing plate is welded to the bottom ends of the pulling stand columns, fixing holes are formed in the two ends of the fixing plate, and anchor rods penetrate through the fixing holes downwards to be inserted into the ground to fix the fixing plate to the ground. The test pile is arranged on the ground and located at the symmetric center position of the rigid beam, the jack is installed at the top end of the test pile, the telescopic table is installed at the lower end of the rigid beam, the jack abuts against the lower end of the telescopic table, and a sensor is arranged on the test pile. According to the utility model, the problems of high transportation cost and complex foundation treatment in a single-pile vertical compressive static load test can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering testing technology, specifically relating to a loading device for static load test of vertical compressive strength of a single pile. Background Technology

[0002] With urban development, land resources in some cities are becoming increasingly scarce, and buildings are becoming very tall, placing stricter requirements on common monopiles. Engineering quality testing is an essential means to ensure the quality of construction projects. Existing construction projects conduct static load tests on the vertical compressive strength of monopiles. The loading devices for these test piles typically include two types: anchor pile reaction beam devices and counterweight platform reaction devices. The anchor pile reaction beam device utilizes multiple engineering piles or multiple anchor piles, connecting anchor rods to the upper part of the anchor piles or using the longitudinal reinforcement on the engineering piles to anchor the reaction beam. The monopil to be tested is then loaded using jacks to conduct the static load test on the vertical compressive strength of the monopil. However, this type of anchor pile reaction beam device has significant limitations. For example, it requires selecting engineering piles at a suitable distance as anchor piles. If there are not suitable and sufficient engineering piles at the suitable distance as anchor piles, it is necessary to spend a lot of money to construct concrete cast-in-place piles as anchor piles. Moreover, after the anchor piles are constructed, the pile bearing capacity test can only be carried out after the pile body reaches the required age, which greatly delays the construction project schedule and makes the constructed anchor piles unfavorable for later construction.

[0003] The counterweight platform reaction device, by stacking a sufficient number of concrete load-bearing blocks on the counterweight platform at one time, greatly increases the transportation and hoisting costs due to the large number and weight of steel beams used in the counterweight platform, the larger volume of concrete load-bearing blocks to be transported, and the higher transportation costs. Furthermore, it requires foundation reinforcement or replacement treatment, thereby increasing the foundation treatment costs at the location of the counterweight platform pier, and there is also the safety risk caused by the instability of the foundation that cannot be completely avoided. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a loading device for a static load test of vertical compressive strength of a single pile, which can solve the problems of high transportation cost and complex foundation treatment in the static load test of vertical compressive strength of a single pile.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A loading device for a static load test of a single pile vertical compressive strength includes a rigid beam, a tie column assembly, a test pile, a fixing plate, anchor bolts, a telescopic platform, and jacks. The tie column assembly consists of two sets, each set including two tie columns. The two tie columns are respectively positioned on the left and right sides of the rigid beam. An upper base plate and a lower base plate are fixed between the two tie columns using large nuts. The upper and lower base plates connect the two tie columns together. The rigid beam is installed between the two sets of tie column assemblies. The fixing plate is welded to the tie column assembly. At the bottom of the column, fixing holes are opened at both ends of the fixing plate. The anchor rod passes downward through the fixing holes and is inserted into the ground to fix the fixing plate to the ground. The test pile is set on the ground and located at the symmetrical center of the steel beam. The lower end of the test pile is deeply buried in the ground and fixed to the hard rock and soil layer. The jack is installed at the top of the test pile. The telescopic platform is installed at the lower end of the steel beam. The telescopic platform and the jack are positioned correspondingly. The jack is supported at the lower end of the telescopic platform. Sensors are installed on the test pile.

[0007] Furthermore, the tie column is a φ300 steel column.

[0008] Furthermore, the two ends of the rigid beam are fixed between the upper and lower base plates of the two sets of tie column assemblies. The lower base plate is supported at the bottom of the rigid beam, and the upper base plate is pressed onto the top of the rigid beam and tightened onto the tie column by a large nut.

[0009] Furthermore, a washer is provided between the upper base plate and / or the lower base plate and the large nut.

[0010] Furthermore, the fixing plate is long and narrow, and is a steel plate with a thickness of 200mm.

[0011] Furthermore, the anchor rod consists of a body, a steel core, a steel blade, a drill bit, a fixing block, and a spring. The body is a cylindrical structure made of solid steel, with a groove at its axial center. The steel core is placed in the groove and can move within it. The drill bit is mounted on the top of the body and is a conical structure made of high-strength steel. The body has multiple through slots through which the steel blade passes and enters the body, and is fixed to the steel core by a rotating shaft. One end of the spring is fixed to the steel blade, and the other end is fixed to the inner wall of the body. The fixing block is located at the rear end of the body.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This utility model has a simple structure and strong adaptability. It can adjust the height balance of the rigid beam through the adjustment structure composed of anchor rods, large nuts and washers. It is easy to install and use in situations where there are uneven pile foundations. It is suitable for complex construction environments. Moreover, the anchor rods used are relatively lightweight, easy to install, low in transportation costs, and can be recycled, which can effectively reduce costs and will not cause serious damage to the foundation. This device can effectively solve the problems of high cost and complex construction of traditional testing devices. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of the loading device for the static load test of vertical compressive strength of a single pile as described in this utility model;

[0015] Appendix Figure 2 This is a top view of the single pile vertical compressive static load test loading device described in this utility model;

[0016] Appendix Figure 3 It is attached Figure 1 The diagram shows the structure of the anchor bolt. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 , Figure 2As shown, a single-pile vertical compressive static load test loading device includes a rigid beam 1, a tie column assembly 2, a test pile 4, a fixing plate 5, an anchor rod 6, a jack 7, and a telescopic platform 8. The rigid beam 1 is a channel steel beam processed from high-strength steel, with internal stiffening ribs to enhance its strength and rigidity. The steel beam plate thickness is 25mm, which can be adjusted according to the actual project. The tie column assembly 2 consists of two sets, each set including two tie columns 21. The tie columns 2 are φ300 steel columns used to bear the tensile force. The two tie columns 21 are respectively set on the left and right sides of the rigid beam 1. An upper base plate 22 and a lower base plate 23 are fixed between the two tie columns 21 by a large nut 3. The upper base plate 22... The upper base plate 22 and the lower base plate 23 connect the two tie columns 21 together. The upper base plate 22 and the lower base plate 23 are used to fix the rigid beam 1. The rigid beam 1 is installed between the two sets of tie column assemblies 2. Preferably, the two ends of the rigid beam 1 are fixed between the upper base plate 22 and the lower base plate 23 of the two sets of tie column assemblies 2. The lower base plate 23 serves as a bottom support. The upper base plate 22 is pressed onto the top of the rigid beam 1 and is tightened and fixed to the tie column 2 by the large nut 3. In order to enhance the stability of the connection between the upper base plate 22, the lower base plate 23 and the tie column 21, a shim 24 is provided between the upper base plate 22 and / or the lower base plate 23 and the large nut 3. At the same time, the shim 24 can adjust the height of the rigid beam 1.

[0019] The fixing plate 5 is welded to the bottom of the tie column 21. The fixing plate 5 is long and narrow, preferably made of 200mm thick steel plate. Fixing holes are opened at both ends of the fixing plate 5. The anchor rod 6 passes through the fixing holes and is inserted into the ground to fix the fixing plate 5 to the ground. Each tie column 21 is fixed to the ground by the fixing plate 5 and two anchor rods 6. The fixing plate 5 can increase the bearing area and facilitate fixing. The anchor rods 6 can also increase the firmness of the fixing plate 5 to the ground. The anchor rod 6, the large nut 3, and the washer 31 form a support that can adjust the height balance of the rigid beam 1, which is convenient for installation and use when there is unevenness in the pile foundation.

[0020] like Figure 3As shown, the anchor rod 6 consists of a body 61, a steel core 62, a steel blade 63, a drill bit 64, a fixing block 65, and a spring 66. The body 61 is a cylindrical structure made of solid steel, with a groove at its axial center. The steel core 62 is placed in the groove and can move within it. The drill bit 64 is mounted on the top of the body 61 and is a conical structure made of high-strength steel to facilitate the insertion of the anchor rod 6 into the soil. The body 61 has multiple through slots, with 2-4 slots as needed. The steel blade 63 passes through the through slots into the body 61 and is fixed to the steel core 62 by a rotating shaft 67. The steel blade 63 can rotate around the shaft. The center operates in an opening and closing motion. When the steel blade 63 opens outward, it anchors the soil. The reaction force of the final test is transmitted to the soil. One end of the spring 66 is fixed to the steel blade 63, and the other end is fixed to the inner wall of the body 61. When the steel core 62 pushes inward, the steel blade 63 closes inward. When the steel core 62 pulls outward, the steel blade 63 opens outward, thereby locking the soil. The fixing block 65 is located at the rear end of the body 61. The fixing block 65 is used to protect the anchor rod 6 and prevent it from being damaged. The length of the body 61 and the number of steel blades 63 can be set according to the actual engineering conditions, i.e., the required amount of reaction force. This anchor rod is relatively lightweight, easy to install and transport, and can be reused, reducing the cost of use.

[0021] The test pile 4 is set on the ground and located at the symmetrical center of the steel beam 1. The lower end of the test pile 4 is deeply buried in the ground and fixed to the hard rock and soil layer, so that the test pile 4 will not settle when subjected to force. The jack 7 is installed at the top of the test pile 4, and the telescopic platform 8 is installed at the lower end of the steel beam 1. The telescopic platform 8 corresponds to the position of the jack 7. The jack 7 is supported at the lower end of the telescopic platform 8. The telescopic platform 8 can also be adjusted in height to ensure that the range of the jack 7 is applicable. The force of the single pile vertical compressive static load test is transmitted to the telescopic platform 8 through the jack 7. The test pile 4 is equipped with a sensor, which is connected to an external inspection device. The sensor collects the displacement and force data of the test pile to evaluate its bearing capacity.

[0022] The working principle of this utility model is as follows:

[0023] The device forms a stable reaction system through anchor rods 6 and rigid beams 1, and uses jacks 7 to apply vertical pressure to the test pile 4 to complete the static load test of a single pile's vertical compressive strength. During use, anchor rods 6 are drilled into the ground and anchored to the soil by steel blades 63, providing reliable reaction support. The rigid beam 1 is connected to the anchor rods 6 via tie-up column assembly 2 and is kept horizontal and stable by adjusting large nuts 3 and washers 24, responsible for transferring the loading reaction force to the anchor rods 6. The test pile 4 is deeply embedded in a hard rock and soil layer, with jacks 7 installed on top. The loading force is transferred to the test pile 4 through a telescopic platform 8. During loading, sensors on the test pile 4 collect displacement and stress data in real time to evaluate its bearing capacity. After the test, the pressure of jacks 7 is released, and steel blades 63 retract to the main body under the action of springs 66, facilitating disassembly and reuse of the device.

[0024] This utility model has a simple structure and strong adaptability. It can adjust the height balance of the rigid beam through the adjustment structure composed of anchor rods, large nuts and washers. It is easy to install and use in situations where there are uneven pile foundations. It is suitable for complex construction environments. Moreover, the anchor rods used are relatively lightweight, easy to install, low in transportation costs, and can be recycled, which can effectively reduce costs and will not cause serious damage to the foundation. This device can effectively solve the problems of high cost and complex construction of traditional testing devices.

[0025] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A loading device for a static load test of vertical compression resistance of a single pile, comprising a rigid beam, a tie column assembly, a test pile, a fixing plate, an anchor bolt, a telescopic platform, and a jack, characterized in that: The tie column assembly consists of two sets, each set including two tie columns. The two tie columns are respectively set on the left and right sides of the steel beam. An upper base plate and a lower base plate are fixed between the two tie columns by a large nut. The upper and lower base plates connect the two tie columns together. The steel beam is installed between the two sets of tie column assemblies. The fixing plate is welded to the bottom end of the tie column. Fixing holes are opened at both ends of the fixing plate. The anchor rod passes downward through the fixing holes and is inserted into the ground to fix the fixing plate to the ground. The test pile is set on the ground and located at the symmetrical center of the steel beam. The lower end of the test pile is deeply buried in the ground and fixed to a hard rock and soil layer. The jack is installed at the top of the test pile. The telescopic platform is installed at the lower end of the steel beam. The telescopic platform is positioned corresponding to the jack. The jack is supported at the lower end of the telescopic platform. Sensors are installed on the test pile.

2. The loading device for static load test of vertical compressive strength of a single pile according to claim 1, characterized in that: The tie column is a φ300 steel column.

3. The loading device for static load test of vertical compressive strength of a single pile according to claim 1, characterized in that: The two ends of the rigid beam are fixed between the upper and lower base plates of the two sets of tie column assemblies. The lower base plate is supported at the bottom of the rigid beam, and the upper base plate is pressed onto the top of the rigid beam and tightened onto the tie column by a large nut.

4. The loading device for static load test of vertical compressive strength of a single pile according to claim 3, characterized in that: A washer is provided between the upper base plate and / or the lower base plate and the large nut.

5. The loading device for static load test of vertical compressive strength of a single pile according to claim 1, characterized in that: The fixing plate is long and narrow, and is made of steel plate with a thickness of 200mm.

6. The loading device for static load test of vertical compressive strength of a single pile according to claim 1, characterized in that: The anchor rod consists of a body, a steel core, a steel blade, a drill bit, a fixing block, and a spring. The body is a cylindrical structure made of solid steel, with a groove at its axial center. The steel core is placed in the groove and can move within it. The drill bit is mounted on the top of the body and is a conical structure made of high-strength steel. The body has multiple through slots through which the steel blade passes and enters the body, and is fixed to the steel core by a pivot. One end of the spring is fixed to the steel blade, and the other end is fixed to the inner wall of the body. The fixing block is located at the rear end of the body.

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