A static load test device for pile foundations in construction engineering

Abstract

The present invention relates to the technical field of pile foundation detection, and specifically provides a static load test device for pile foundations in construction engineering; it includes four anchor piles, a series connection frame connected in series between the four anchor piles, a reaction beam group, four anti-pulling assemblies arranged in one-to-one correspondence with the four anchor piles, and a force application assembly for applying an upward jacking force to the main beam; the device provided by the present invention is improved based on the existing anchor pile method test system, improving the efficiency and safety of assembly and connection, strengthening the integrity of the equipment system, indirectly improving the centering and vertical concentration of the reaction force acting on the pile foundation, and enhancing the test effect and accuracy of the experiment.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation detection, and specifically provides a static load test device for pile foundations in construction engineering. Background Art

[0002] A pile foundation is a type of deep foundation, which is widely used in many fields such as construction engineering, bridge engineering, and marine structures. By transferring the load of a building to deeper and harder soil layers or rocks, it provides the necessary support and stability, thereby reducing the impact of soft surface soil layers on the building.

[0003] The main functions of a pile foundation are to increase the stability of the building's foundation structure, reduce settlement, and improve the uplift resistance. Therefore, the reliability of the pile foundation is an important basis for ensuring the safety of buildings. During the construction process of construction engineering, test piles are usually set up to detect their reliability and stability. Relevant experiments include static load test tests, and static load tests include single-pile vertical compressive static load tests, single-pile vertical uplift static load tests, and single-pile horizontal static load tests, etc. Among them, the single-pile vertical compressive static load test is used to detect the vertical compressive bearing capacity of the pile foundation.

[0004] Under the existing technology, the stacking method, the anchor pile method, and the self-balancing method are three common methods used for single-pile vertical compressive static load tests, and the self-balancing method is closer to the actual stress state of the pile foundation compared to the stacking method and the anchor pile method. The present invention provides a static load test device for pile foundations in construction engineering, which mainly conducts single-pile vertical compressive static load tests using the anchor pile method. The anchor pile method mainly uses the cooperation of a reaction beam and anchor piles to generate a reaction force, which is then applied reversely to the pile foundation to detect the compressive bearing capacity of the pile foundation. The existing anchor pile method devices are similar, but generally have the following problems: (1) Anchor piles are mostly pre-cast concrete piles, which require prior preparatory construction, resulting in reduced test flexibility and convenience, a longer test period, and after the experiment is completed, the anchor piles are basically discarded, increasing the test cost.

[0005] (2) In the static load test system of the anchor pile method, anchor piles mainly serve as the basis for providing reaction forces. The anchor piles are independent of each other. During the experiment, due to the different soil geological environments of each anchor pile, there are differences in the reaction forces provided by different anchor piles, resulting in different positions of the action points of the resultant reaction force acting on the test pile, affecting the neutrality of the pressure acting on the top of the test pile, and thus affecting the authenticity and accuracy of the experimental results to a certain extent.

[0006] (3) In the existing anchor pile method devices, the lap assembly method is relatively arbitrary, and there is no structural design for quick disassembly and assembly, resulting in difficult assembly, low efficiency, and affecting the construction safety. In addition, most of them also require additional support materials to support the equipment system, affecting convenience. Summary of the Invention

[0007] To solve the above problems, the present invention provides a static load test device for building engineering pile foundations to solve the problems mentioned in the above background art.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A static load test device for building engineering pile foundations, comprising: four anchor piles capable of being screwed into and out of the soil layer; a series-connected frame connected in series between the four anchor piles, and the series-connected frame and the four anchor piles form an integral structure that jointly forms an uplift force; a reaction beam group including a main beam and two anchor pile beams slidably and relatively installed on the main beam, and a plurality of buffer support platforms for buffering and supporting the main beam are arranged on the series-connected frame; four anti-pull assemblies are correspondingly arranged in cooperation with the four anchor piles, and two anti-pull assemblies distributed on both sides of the main beam are detachably installed on each anchor pile beam; the anchor pile is of a hollow structure, and a hanging slot is arranged in the hollow structure of the anchor pile, and the anti-pull assembly includes a positioning member that can be correspondingly inserted into the hanging slot. When the positioning member is inserted into the hanging slot, the central axis of the anti-pull assembly coincides with the central axis of the corresponding anchor pile, and the anchor pile can be suspended and docked on the insertion end of the positioning member; and a force application assembly is detachably installed on the main beam and placed on the test pile for applying an upward jacking force to the main beam.

[0009] Preferably, the anchor pile includes: a top plate, to which the series-connected frame is docked; and a screw pile fixed to the bottom end of the top plate, and the hollow structure of the anchor pile is opened from the top end of the top plate and extends into the interior of the screw pile.

[0010] Preferably, the series-connected frame includes: two insertion beams correspondingly distributed below the two anchor pile beams, and the two insertion beams are detachably installed between the top plates of the two anchor piles corresponding to the lower parts of the corresponding anchor pile beams; the buffer support platforms are correspondingly arranged on both insertion beams; and a plurality of series-connection members are detachably connected between the two insertion beams.

[0011] Preferably, the anti-pull assembly further includes: a pressure plate in a disc shape and horizontally slidably inserted and installed on the top of the anchor pile beam; the positioning member is assembled at the center position of the pressure plate; and a plurality of tie rods are circumferentially distributed around the center of the pressure plate; the upper ends of the plurality of tie rods are detachably connected to the pressure plate, and the lower ends are all fixed to the top plate.

[0012] Preferably, the positioning member includes: a screw rod vertically penetrating through the center of the pressure plate and threadedly installed on the pressure plate. A notch groove extending along the length direction is formed at one end of the anchor pile beam, and the screw rod passes through the notch groove; and a positioning insert block, which is cylindrical and coaxially rotatably installed at the bottom end of the screw rod. A plurality of supporting keys are arranged on the side wall of the positioning insert block; the hanging slot includes a plurality of guiding grooves vertically extending from the top end of the top plate and a circumferential cutting groove communicated with the bottom ends of the guiding grooves. The plurality of supporting keys are correspondingly slidably matched with the plurality of guiding grooves; when the supporting keys are completely moved into the circumferential cutting groove, by rotating the positioning insert block, the supporting keys can avoid the guiding grooves, and the top end surface of the circumferential cutting groove can be lapped on the plurality of supporting keys.

[0013] Preferably, a plurality of jack holes are circumferentially distributed on the top plate, and the depth of the jack holes extends along the radial direction of the top plate; the insertion beam includes: a middle beam, which is a shell structure with open ends at both ends; the buffer supporting platform is fixed on the upper end surface of the middle beam; and two side beams, which are horizontally symmetrically arranged and one end of each is respectively slidably installed at the two ports of the middle beam in a matching manner; the other end of the side beam is provided with an insertion plate inserted and matched with the jack hole.

[0014] Preferably, the force application assembly includes: a bearing plate for horizontally placing on the top end of the test pile; at least one hydraulic cylinder vertically fixed on the upper end surface of the bearing plate; and a supporting assembly fixed on the output end of the hydraulic cylinder and detachably fixed on the main beam.

[0015] Preferably, the supporting assembly includes: a supporting seat fixed on the output end of the hydraulic cylinder; a plugging column fixed on the top end surface of the supporting seat. The main beam is horizontally placed on the supporting seat, and the plugging column is inserted into the main beam from the bottom end of the main beam. A through hole is horizontally and jointly formed on the plugging column and the main beam in a matching manner; a plugging block is inserted through the through hole; and a locking plate, which is in a U shape, is inversely sleeved on the top end of the main beam, and both ends of the plugging block are fixed on the locking plate.

[0016] Preferably, a sleeve seat is fixed on the top end of the side beam; the connecting member is a connecting plug rod, and the connecting plug rod is inserted between the sleeve seats on two side beams in opposite positions of two insertion beams.

[0017] The above technical solution has the following advantages or beneficial effects: The present invention provides a static load test device for pile foundations in construction engineering. With a modular assembly design, it can achieve rapid assembly and connection step by step and layer by layer, improving the standardization, convenience, and safety of assembly construction, and reducing the difficulty of assembling and connecting the equipment system. In addition, in the equipment system, a recyclable anchor pile design replaces the existing pre-cast anchor pile structure, which can shorten the test cycle and reduce the test cost. A series connection frame is used in conjunction with multiple anchor piles. The four anchor piles are connected in series by the series connection frame to form an anchor pile foundation frame that can jointly form a reaction force. By connecting in series, the independence between the anchor piles is eliminated, the integrity is enhanced, the difference in the reaction forces formed during the experiment between the four anchor piles can be indirectly weakened, the optimized distribution of the reaction force can be achieved, and the centering of the reaction force resultant relative to the loading end of the test pile can be enhanced. The buffer support structure added to the series connection frame can assist in self-supporting the reaction beam group, enhancing the stability of the equipment structure. In the anti-pull assembly, the addition of positioning components improves the stability and safety during the assembly and connection process of the equipment, and at the same time strengthens the reaction force structure formed in cooperation with the anchor piles. In summary, the equipment provided by the present invention is improved based on the existing anchor pile method test system, improving the efficiency and safety of assembly and connection, strengthening the integrity of the equipment system, indirectly improving the centering and vertical concentration of the reaction force acting on the pile foundation, and enhancing the test effect and accuracy of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the present invention and its features, shape, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the emphasis is on showing the gist of the present invention.

[0019] Figure 1 FIG. 1 is a perspective structure diagram of a static load test device for pile foundations in construction engineering provided by the present invention.

[0020] Figure 2 FIG. 2 is a top view of a static load test device for pile foundations in construction engineering provided by the present invention.

[0021] Figure 3 FIG. Figure 2 is a sectional view taken along line A-A in FIG.

[0022] Figure 4 FIG. Figure 2 is a sectional view taken along line B-B in FIG.

[0023] Figure 5 FIG. 5 is a perspective sectional view of the connection and assembly of the anti-pull assembly and the anchor pile.

[0024] Figure 6 FIG. 6 is a perspective structure diagram of the series connection frame.

[0025] Figure 7 It is a three-dimensional sectional view of the force application assembly and the main beam assembled.

[0026] In the figure: 1. Anchor pile; 11. Top plate; 111. Hanging slot; 112. Insertion hole; 12. Screw column; 2. Serial frame; 21. Opposite insertion beam; 211. Middle beam; 212. Side beam; 213. Insertion plate; 214. Sleeve seat; 215. Buffer support table; 216. Guide column; 217. Support plate; 218. Support spring; 22. Serial insertion rod; 3. Reaction beam group; 31. Main beam; 32. Anchor pile beam; 321. Notch groove; 4. Anti-pull assembly; 41. Pressure plate; 42. Positioning component; 421. Screw; 422. Positioning insert block; 423. Support key; 43. Pull rod; 5. Force application assembly; 51. Bearing plate; 52. Hydraulic cylinder; 53. Support component; 531. Support seat; 532. Insertion column; 533. Horizontal insert block; 534. Locking plate. Specific implementation manner

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown in the figure, a static load test device for building engineering pile foundations is used to conduct a single-pile vertical compressive static load test on concrete pile foundations to detect the vertical compressive bearing capacity of the pile foundations. The specific test method used is the anchor pile method, and this device constitutes the test system. The device includes four recoverable anchor piles 1. The anchor pile 1 includes a top plate 11 and a spiral pile welded to the bottom end of the top plate 11. The anchor pile 1 is of a hollow structure, and the hollow structure of the anchor pile 1 is opened at the top end of the top plate 11 and extends into the interior of the spiral pile. The bottom end of the spiral pile is pointed. In the present invention, the recoverable anchor pile 1 replaces the existing precast anchor pile 1 made of concrete pouring, improving the convenience of installing the anchor pile 1 and its recyclability after use. During the experiment preparation process, the anchor pile 1 can be screwed and driven into the foundation soil layer structure through an existing rotary press pile driver (a plug-in end for docking with the rotary press end of the rotary press pile driver is provided on the top plate 11), so that the four anchor piles 1 are reasonably distributed around the test pile. The four anchor piles 1 are generally distributed at the four top corners of a virtual rectangle with the center position of the test pile as the intersection point of the diagonals. It should be noted that the anchor piles 1 shown in the figure do not represent the actual length ratio. In actual use, according to the characteristics of the soil layer structure around the test pile, an anchor pile 1 with an appropriate length can be selected so that the anchor pile 1 can provide sufficient uplift force to meet the experimental requirements.

[0030] As Figure 1 and Figure 2 shown, in the anchor pile method test system for single-pile vertical compressive static load test constituted by the device provided by the present invention, in order to eliminate the independence between the existing anchor piles 1 and reduce the difference in the reaction forces provided between the anchor piles 1, therefore, a series connection frame 2 is connected in series between the four anchor piles 1. The series connection frame 2 includes two insertion beams 21 and two series connection rods 22. One insertion beam 21 is connected between two of the anchor piles 1, and the other insertion beam 21 is connected between the other two anchor piles 1.

[0031] As Figure 1 , Figure 4 and Figure 6As shown in the figure, four rectangular jacks 112 are circumferentially and evenly distributed on the top plate 11, and the depth of the jack 112 extends along the radial direction of the top plate 11; the butt beam 21 includes a middle beam 211 and two side beams 212. The middle beam 211 has a housing structure with open ends at both ends; the two side beams 212 are horizontally symmetrically arranged and one end of each is respectively slidably and fittingly installed at the two ports of the middle beam 211; a plug-in plate 213 that is inserted and fitted with the jack 112 is welded to the other end of the side beam 212. It should be noted here that during the process of screwing the anchor piles 1 into the soil layer, the four anchor piles 1 are at the same horizontal height, and the jacks 112 are in a relatively aligned state, so as to facilitate the docking and assembly of the subsequent series-connected frame 2. A sleeve seat 214 is welded to the top end of the side beam 212; the series-connected insertion rod 22 is inserted between the sleeve seats 214 on the two side beams 212 in relative positions on the two butt beams 21. In the present invention, the four anchor piles 1 are connected in series by the series-connected frame 2 to form an anchor pile 1 foundation frame that can jointly form a reaction force. By connecting in series, the independence between the anchor piles 1 is eliminated, the integrity is enhanced, the difference in the reaction forces formed during the experiment between the four anchor piles 1 can be indirectly weakened, the optimized distribution of the reaction forces can be realized, and the centering of the resultant reaction force relative to the force application end of the test pile can be enhanced.

[0032] After the four anchor piles 1 are driven into the foundation soil layer, the docking and assembly of the series-connected frame 2 can be carried out. Specifically, first, the butt joints of the two butt beams 21 are completed in sequence. The butt beam 21 is placed between the two anchor piles 1, and then the two side beams 212 are pulled outwards, and the plug-in plate 213 is aligned and inserted into the jack 112. Subsequently, the series-connected insertion rod 22 is inserted between the two sleeve seats 214 in relative positions, thus completing the rapid assembly of the series-connected frame 2.

[0033] As Figure 1 、 Figure 3 and Figure 7As shown, a reaction beam group 3 can be installed on the basis of the serial frame 2, and the reaction beam group 3 includes a main beam 31 and two anchor beams 32 relatively slidably mounted on the main beam 31, and the two anchor beams 32 are distributed one by one above the two inserted beams 21; a slide groove is provided on the main beam 31 for positioning and sliding with the middle part of the anchor beam 32, so as to improve the stability and standardization of the assembly and avoid simply stacking the anchor beams 32 on the main beam 31; a force assembly 5 is centrally mounted on the main beam 31; the force assembly 5 includes a pressure plate 51 horizontally placed on the top of the test pile, and in order to improve the uniformity of the jacking force distribution, four hydraulic cylinders 52 are vertically welded and fixed on the upper end surface of the pressure plate 51, and the pressure plate 51 is a square plate, and the four hydraulic cylinders 52 are evenly distributed around the center of the pressure plate 51; The output ends of the four hydraulic cylinders 52 are commonly installed with a supporting assembly 53 that is detachably fixed on the main beam 31. The supporting assembly 53 includes a supporting seat 531 horizontally welded to the output ends of the four hydraulic cylinders 52. A plug-in column 532 is welded in the center of the top surface of the supporting seat 531. A plug-in hole that cooperates with the plug-in column 532 is opened at the bottom end of the main beam 31. The main beam 31 is horizontally placed on the supporting seat 531. The plug-in column 532 is plugged into the plug-in hole from the bottom end of the main beam 31. The plug-in column 532 and the main beam 31 cooperate to open a rectangular through hole horizontally through. A plug-in block is inserted through the through hole to realize the locking between the plug-in column 532 and the main beam 31. A 匚-shaped locking plate 534 is invertedly mounted on the top end of the main beam 31, and both ends of the plug-in block are fixed to the locking plate 534 by bolts. The supporting assembly 53 is used to improve the convenience of assembly and disassembly, and ensure the reliability of the assembly connection with the main beam 31.

[0034] like Figure 1 , Figure 4 and Figure 6 As shown, the middle beams 211 of the two inserted beams 21 are each provided with a buffer support platform 215 which forms a buffer support for the main beam 31; the buffer support platform 215 includes a plurality of guide columns 216 vertically welded to the upper end surface of the middle beam 211, and a support plate 217 is installed between the plurality of guide columns 216 in a sliding manner, and a support spring 218 is sleeved on the guide column 216, and the two ends of the support spring 218 are respectively welded to the middle beam 211 and the support plate 217.

[0035] When assembling and constructing the reaction force beam group 3, first place the overall structure of the force application assembly 5 except for the horizontal insertion block 533 and the locking plate 534 steadily on the top surface of the test pile. Subsequently, the main beam 31 can be aligned and inserted with the insertion column 532 through a crane device and placed on the plane jointly formed by the support seat 531 and the two support plates 217. Then, insert the horizontal insertion block 533 and lock it with the locking plate 534. Finally, hoist and install the two anchor pile beams 32 in cooperation on the main beam 31. In the present invention, by providing the installation buffer support platform 215, the system is equipped with an auxiliary support structure for supporting the main beam 31 by itself, eliminating the need to find other auxiliary support materials to support the main beam 31, improving the assembly safety while enhancing the convenience.

[0036] As Figure 4 and Figure 5 shown, anti-pull assemblies 4 are assembled and arranged at positions near both ends on the two anchor pile beams 32, and the four anti-pull assemblies 4 are arranged in one-to-one correspondence and cooperation with the four anchor piles 1; the anti-pull assembly 4 includes a pressure plate 41 in the shape of a disc, a chute extending along the length direction of the anchor pile beam 32 is provided on the anchor pile beam 32, the pressure plate 41 is slidably matched with the chute of the anchor pile beam 32, and the pressure plate 41 is located at the top of the anchor pile beam 32; two groups of tie rods 43 distributed on both sides of the anchor pile beam 32 are assembled on the pressure plate 41, and multiple tie rods 43 in each group are circumferentially and evenly distributed around the center of the pressure plate 41; the tie rods 43 vertically pass through the pressure plate 41, and the tie rods 43 are detachably connected to the pressure plate 41 by nuts near the top end positions, and the bottom ends of the tie rods 43 are welded to the top plate 11.

[0037] As Figure 1 , Figure 4 and Figure 5 shown, a positioning component 42 for cooperating with the anchor pile 1 is assembled at the center position of the pressure plate 41. The positioning component 42 includes a screw rod 421 vertically penetrating through the center of the pressure plate 41, the screw rod 421 is threadedly installed on the pressure plate 41, a notch groove extending along the length direction of the anchor pile beam 32 is opened from the end of the anchor pile beam 32, and the screw rod 421 passes through the notch groove; the bottom end of the screw rod 421 is rotatably installed with a cylindrical positioning insert 422 through a bearing, and the positioning insert 422 is coaxially assembled with the screw rod 421; two support keys 423 are provided on the side wall of the positioning insert 422; a hanging slot 111 is opened in the hollow structure of the anchor pile 1, and the hanging slot 111 includes two guiding grooves vertically extending from the top end of the top plate 11 and a circumferential cutting groove communicated with the bottom ends of the guiding grooves. The two support keys 423 are slidably matched with the two guiding grooves correspondingly, and the width of the circumferential cutting groove in the vertical direction is greater than the vertical length of the support key 423; when the support key 423 is completely moved into the circumferential cutting groove, by rotating the positioning insert 422, the support key 423 can avoid the guiding groove, and the top surface of the circumferential cutting groove can be lapped on the two support keys 423.

[0038] After completing the assembly and construction of the reaction force beam group 3, the anti-pulling assembly 4 can be assembled. Specifically, the pressure plate 41 can be slid and inserted onto the anchor pile beam 32. When the anchor pile beam 32 is in the hoisting state, on the one hand, the position of the anchor pile beam 32 is adjusted by sliding, and on the other hand, the position of the pressure plate 41 is adjusted by sliding so that the center of the pressure plate 41 is vertically aligned with the center of the corresponding anchor pile 1. Subsequently, the screw 421 can be rotated to lower the positioning insert block 422, and the supporting key 423 is aligned with the guiding groove by rotating the positioning insert block 422. Then, it continues to descend, and the positioning insert block 422 is inserted into the hanging slot 111 until the supporting key 423 touches the top of the circumferential cutting groove. The position of the pressure plate 41 can be locked by the corresponding insertion of the positioning component 42 and the anchor pile 1. And through the downward resistance of the positioning insert block 422, the anchor pile beam 32 is indirectly supported by the positioning component 42. Subsequently, the tie rods 43 are tightened one by one so that the nuts on the tie rods 43 are pressed against the pressure plate 41. Finally, first rotate the positioning insert block 422 to misalign the supporting key 423 from the guiding groove, and then reverse-rotate the screw 421 to raise the positioning insert block 422 to the position where the circumferential cutting groove is lapped on the two supporting keys 423, so that the positioning component 42 can cooperate with the tie rod 43 to jointly form a vertical pulling force on the anchor pile 1, improve the stability of the reaction force formed by the anchor pile 1, promote the reaction force formed by the anchor pile 1 to be in the vertical direction, so as to improve the concentration and accuracy of the vertical compressive reaction force direction of a single pile.

[0039] It should be noted that what is the same between the equipment provided by the present invention and the existing anchor pile method test equipment is that it is also necessary to cooperate with the installation of existing test monitoring equipment for the monitoring and acquisition of experimental data. At least, existing load sensors, pressure sensors, displacement gauges, strain sensors, and data acquisition systems, etc. need to be installed. Among them, the load sensor can be installed on the bearing plate 51 to directly and accurately monitor the force applied to the test pile foundation. The pressure sensor is used to monitor the pressure change of the hydraulic cylinder 52. The displacement gauge is used to detect the settlement displacement of the foundation under pressure in real time. The strain sensor can be pre-attached to the surface or inside of the test pile foundation to monitor the stress distribution of the foundation under pressure, and the data acquisition system is used to collect and summarize the above various monitoring data for data storage, processing, and subsequent analysis.

[0040] During the experiment, the jacking forces of the four hydraulic cylinders 52 are gradually increased synchronously, so that the reaction force system formed by the equipment converts the jacking force applied by the hydraulic cylinder 52 into a downward pressure applied to the foundation. The jacking force is gradually increased to a predetermined value and maintained at the corresponding load for a period of time to make the foundation generate a response, and observe and monitor the settlement displacement, settlement rate of the foundation under the corresponding load, and observe whether there is structural damage, etc. The vertical compressive static load capacity of the foundation is comprehensively analyzed through the data collected by the experimental monitoring.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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, and thus should not be construed as a limitation to the present invention.

[0042] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0043] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments. The devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A static load test device for pile foundations in construction engineering, characterized in that, Comprising: Four anchor piles capable of being screwed into and out of the soil layer; A series-connected frame connected in series between the four anchor piles. The series-connected frame and the four anchor piles form an integral structure that jointly forms an uplift force; A reaction beam group including a main beam and two anchor pile beams slidably and relatively installed on the main beam. A plurality of buffer support platforms for buffering and supporting the main beam are arranged on the series-connected frame; Four anti-pull assemblies are arranged in one-to-one correspondence with the four anchor piles. Two anti-pull assemblies distributed on both sides of the main beam are detachably installed on each anchor pile beam correspondingly; the anchor pile is of a hollow structure, and a hanging slot is arranged in the hollow structure of the anchor pile. The anti-pull assembly includes a positioning component capable of being correspondingly inserted into the hanging slot. When the positioning component is inserted into the hanging slot, the central axis of the anti-pull assembly coincides with the central axis of the corresponding anchor pile, and the anchor pile can be suspended and docked on the insertion end of the positioning component; And a force application assembly detachably installed on the main beam and placed on the test pile for applying an upward jacking force to the main beam; The anti-pull assembly further includes: A pressure plate in a disc shape and horizontally slidably inserted and installed on the top of the anchor pile beam; the positioning component is assembled at the center position of the pressure plate; And a plurality of tie rods circumferentially distributed around the center of the pressure plate; the upper ends of the plurality of tie rods are detachably connected to the pressure plate, and the lower ends are fixed to the top plate; The positioning component includes: A screw rod vertically penetrating through the center of the pressure plate and threadedly installed on the pressure plate. A notch groove extending along the length direction of the anchor pile beam is opened from the end of the anchor pile beam, and the screw rod passes through the notch groove; The anchor pile includes a top plate and a screw pile, and the screw pile is fixed to the bottom end of the top plate; And a positioning plug block in a cylindrical shape and coaxially rotatably installed at the bottom end of the screw rod. A plurality of supporting keys are arranged on the side wall of the positioning plug block; the hanging slot includes a plurality of guiding grooves vertically extending from the top end of the top plate and a circumferential cutting groove communicated with the bottom end of the guiding groove. The plurality of supporting keys are correspondingly slidably matched with the plurality of guiding grooves; when the supporting keys are completely moved into the circumferential cutting groove, by rotating the positioning plug block, the supporting keys can avoid the guiding grooves, and the top end surface of the circumferential cutting groove can be lapped on the plurality of supporting keys.

2. The static load test equipment for building engineering pile foundation according to claim 1, characterized in that: The series-connected frame is docked with the top plate; the hollow structure of the anchor pile is opened from the top end of the top plate and extends into the interior of the screw pile.

3. The static load test equipment for building engineering pile foundation according to claim 2, characterized in that: The series-connected frame includes: Two insertion beams correspondingly distributed below the two anchor pile beams. The two insertion beams are detachably installed between the top plates of the two anchor piles corresponding to the lower part of the corresponding anchor pile beams; the buffer support platforms are correspondingly arranged on the two insertion beams; And a plurality of series-connection members detachably connected between the two insertion beams.

4. The static load test equipment for building engineering pile foundation according to claim 3, characterized in that: A plurality of insertion holes are circumferentially distributed on the top plate, and the depth of the insertion holes extends along the radial direction of the top plate; the insertion beam includes: A middle beam in a shell structure with open opposite ends; the buffer support platform is fixed on the upper end surface of the middle beam; And two side beams horizontally symmetrically arranged and one end of each of them is correspondingly slidably installed at the two ports of the middle beam; a plug board for plugging and matching with the insertion hole is arranged at the other end of the side beam.

5. The static load test equipment for building engineering pile foundation according to claim 1, characterized in that: The force application assembly includes: A bearing plate for horizontally placing on the top end of the test pile; At least one hydraulic cylinder vertically fixed on the upper end surface of the bearing plate; And a supporting component, which is fixed to the output end of the hydraulic cylinder and detachably fixed to the main beam.

6. The static load test equipment for building engineering pile foundation according to claim 5, characterized in that: The supporting component includes: A supporting seat, which is fixed to the output end of the hydraulic cylinder; A plugging column, which is fixed to the top surface of the supporting seat. The main beam is horizontally placed on the supporting seat, and the plugging column is inserted into the main beam from the bottom end of the main beam. A through hole is horizontally formed through the plugging column and the main beam in cooperation; A plugging block, which is inserted through the through hole; And a locking plate, which is in a U shape, is inversely sleeved on the top of the main beam, and both ends of the plugging block are fixed to the locking plate.

7. An on-site static load test device for building engineering pile foundation according to claim 4, characterized in that: A sleeve seat is fixed to the top end of the side beam; the connecting member is a connecting plug rod, and the connecting plug rod is inserted between the sleeve seats on two side beams in opposite positions in the two inserted beams.

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