Prestressed pipe pile static load test device based on bar planting method

Abstract

The utility model discloses a prestressed pipe pile static load test device based on a bar planting method, which relates to the technical field of pile foundation static load tests and comprises a main beam, a jack, a test pile, a plurality of secondary beams, a plurality of anchor piles and a counter weight. The jack is arranged at the upper end of the test pile; a plurality of secondary beams are symmetrically arranged above the main beam; the end part of each secondary beam corresponds to one anchor pile; the counter weights are uniformly distributed on each secondary beam; the anchor pile comprises an outer pipe, a reinforcement cage and a plurality of connecting rod pieces. The connecting rod piece comprises a first twisted steel, a threaded sleeve and a second twisted steel; the reinforcement cage and the lower end parts of the first twisted steel bars are fixed in the outer pipe through the micro-expansion concrete; the two ends of the threaded sleeve are in threaded connection with one first threaded steel bar and one second threaded steel bar correspondingly. A penetrating gap is formed in the secondary beam; and the upper end of each second twisted steel penetrates through the corresponding penetrating gap and is fixedly connected with one crimping piece. Safety risks are reduced, material usage is reduced, and test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of static load tests for pile foundations, and particularly to a static load test device for prestressed pipe piles based on the reinforcing bar planting method. Background Technique

[0002] Prestressed pipe piles are a type of high-strength precast pile. Piles are formed by static pressure or hammering, and after pile formation, the upper part of the pipe pile is filled with core and reinforced with steel bars.

[0003] Due to advantages such as fast construction speed, relatively low comprehensive cost, and convenient on-site management, prestressed pipe piles have been widely used in pile foundation projects, and prestressed pipe piles are also increasingly commonly used as uplift piles. In traditional uplift static load tests for prestressed pipe piles, since the core filling steel bars reserved at the pile head are too short, it is necessary to extend the steel bars by welding on-site and fix them in the test reaction bearing steel plate, and then apply a jacking load to the reaction bearing steel plate by a jack.

[0004] In the prior art, when using the method of extending steel bars by welding for reaction force conduction, before the uplift static load test, it is necessary to weld and extend the core filling steel bars at the top of the prestressed pipe pile. The on-site preparation time is long, and there are certain safety hazards during the welding process. At the same time, a certain amount of steel bars need to be consumed. If the welding operation is improper, uneven stress or welding detachment is likely to occur during the test, resulting in difficulties in conducting the uplift static load test. Content of the Utility Model

[0005] The purpose of the utility model is to provide a static load test device for prestressed pipe piles based on the reinforcing bar planting method to solve the problems existing in the above prior art, reduce safety risks, reduce material use, and improve test efficiency.

[0006] To achieve the above purpose, the utility model provides the following solution:

[0007] The utility model provides a static load test device for prestressed pipe piles based on the planting bar method, which comprises a main beam, a jack, a test pile, a plurality of secondary beams, a plurality of anchor piles and a counterweight; the jack is arranged at the upper end of the test pile, and the middle part of the main beam is located above the jack; a plurality of the secondary beams are symmetrically arranged above the main beam on both sides of the test pile; each end of the secondary beams corresponds to an anchor pile respectively; and the counterweights are evenly distributed on each of the secondary beams; the anchor pile comprises an outer pipe, a steel reinforcement cage and a plurality of connecting rod members; the connecting rod member comprises a first threaded steel bar, a threaded sleeve and a second threaded steel bar; the steel reinforcement cage is located inside the outer pipe; a part of the lower end of each first threaded steel bar is located inside the steel reinforcement cage, and the upper end of the first threaded steel bar is higher than the upper end of the outer pipe; the outer pipe is filled with slightly expanded concrete, and the slightly expanded concrete fixes the steel reinforcement cage and the lower parts of the first threaded steel bars; the upper end of each first threaded steel bar is in threaded connection with the lower end of a threaded sleeve, and the upper end of the threaded sleeve is in threaded connection with the lower end of a second threaded steel bar; the secondary beam has a through gap at the position corresponding to each second threaded steel bar; the upper ends of each second threaded steel bar respectively pass through the corresponding through gap and are fixedly connected with a pressing member, and the pressing member is pressed on the corresponding secondary beam.

[0008] Preferably, the secondary beam comprises a first secondary beam member and a second secondary beam member; the first secondary beam member and the second secondary beam member are arranged in parallel, and a gap between the first secondary beam member and the second secondary beam member forms the through gap.

[0009] Preferably, the pressing member is provided with a perforation, and the upper ends of each second threaded steel bar sequentially pass through the corresponding through gap and the perforation and are in threaded connection with a threaded fastening sleeve.

[0010] Preferably, first placing blocks are arranged at corresponding positions below the end parts of the main beam.

[0011] Preferably, second placing blocks are arranged at corresponding positions below the end parts of the secondary beam.

[0012] Preferably, the counterweight is a plurality of counterweight blocks.

[0013] Preferably, the pressing member comprises a first pressing plate, a first pressing pipe and a second pressing plate which are arranged from bottom to top in sequence; the first pressing plate is located above the secondary beam; the first pressing plate and the second pressing plate are both provided with openings communicated with the inside of the first pressing pipe; the opening of the first pressing plate, the internal channel of the first pressing pipe and the opening of the second pressing plate jointly form the perforation; the threaded fastening sleeve is located above the second pressing plate, and the threaded fastening sleeve is in threaded connection with the part of the second threaded steel bar passing through the perforation.

[0014] The utility model has achieved the following technical effects compared with the prior art:

[0015] The static load test device for prestressed pipe piles based on the rebar planting method provided by the utility model realizes the connection between the anchor pile and the end of the secondary beam by adopting the first threaded steel bar formed at one time during the pouring of the anchor pile, which is matched with the threaded sleeve and the second threaded steel bar. It is convenient for disassembly and assembly, has high working efficiency, does not require welding throughout the process, and can reduce the safety risks brought by welding; the threaded sleeve and the second threaded steel bar can be recycled, reducing material use; the outer pipe is used in cooperation to form the anchor pile, which is convenient for construction; and the counterweight placed on the secondary beam can, firstly, increase the provided reaction force; secondly, it can reduce the problem of insufficient tension provided by the anchor pile at the end of the secondary beam.

[0016] Furthermore, the secondary beam is composed of a first secondary beam member and a second secondary beam member, which can, firstly, increase the pressure effect provided by a single secondary beam at the position of the main beam, and is convenient for forming a through gap, facilitating the threading and installation of the second threaded steel bar.

[0017] Furthermore, a pressing member is pressed on the secondary beam, and its structure is simple and convenient for installation and disassembly.

[0018] Furthermore, the first placement block placed under the end of the main beam can facilitate the hoisting of the main beam to a specified position and keep a certain height from the ground, so as to ensure its stable placement above the jack.

[0019] Furthermore, the second placement block can facilitate the hoisting of the secondary beam and reduce the safety risks caused by the rolling of the secondary beam.

[0020] Furthermore, a plurality of counterweight blocks are used to form the counterweight, which is convenient for placement and removal.

[0021] Furthermore, the pressing member adopts the cooperation of a first pressing plate, a first pressing pipe and a second pressing plate, so as to increase the pressing effect on the corresponding position of the secondary beam and improve the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the static load test device for prestressed pipe piles based on the rebar planting method provided by the present utility model;

[0024] Figure 2 It is a schematic diagram of the working process of the static load test device for prestressed pipe piles based on the rebar planting method provided by the present utility model.

[0025] In the figure:

[0026] 100 - Static load test device for prestressed pipe piles based on the post - installed rebar method;

[0027] 10 - Test pile; 11 - Pile head reinforcement structure;

[0028] 20 - Jack;

[0029] 30 - Main beam;

[0030] 40 - Secondary beam; 41 - First secondary beam member; 42 - Second secondary beam member; 43 - Passing gap;

[0031] 50 - Anchor pile; 51 - Outer pipe; 52 - Connecting rod member; 521 - First threaded steel bar; 522 - Threaded sleeve; 523 - Second threaded steel bar; 53 - Pressing member; 531 - First pressing plate; 532 - First pressing pipe; 533 - Second pressing plate; 534 - Threaded fastening sleeve. Specific implementation manner

[0032] 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 making creative efforts belong to the protection scope of the present invention.

[0033] The purpose of the present invention is to provide a static load test device for prestressed pipe piles based on the post - installed rebar method to solve the problems existing in the prior art, reduce safety risks, reduce material use, and improve test efficiency.

[0034] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0035] Embodiment 1

[0036] This embodiment provides a static load test device 100 for prestressed pipe piles based on the post - installed rebar method, as Figure 1As shown in the figure, it includes a main beam 30, a jack 20, a test pile 10, multiple secondary beams 40, multiple anchor piles 50 and a counterweight; the jack 20 is arranged at the upper end of the test pile 10, and the middle part of the main beam 30 is located above the jack 20; multiple secondary beams 40 are symmetrically arranged above the main beam 30 on both sides of the test pile 10; each end of the secondary beam 40 corresponds to an anchor pile 50; and the counterweights are evenly distributed on each secondary beam 40; the anchor pile 50 includes an outer pipe 51, a steel reinforcement cage and multiple connecting members 52; the connecting member 52 includes a first threaded steel bar 521, a threaded sleeve 522 and a second threaded steel bar 523; the steel reinforcement cage is located inside the outer pipe 51; a part of the lower end of each first threaded steel bar 521 is located inside the steel reinforcement cage, and the upper end of the first threaded steel bar 521 is higher than the upper end of the outer pipe 51; the outer pipe 51 is filled with slightly expansive concrete, and the slightly expansive concrete fixes the steel reinforcement cage and the lower parts of the first threaded steel bars 521; the upper end of each first threaded steel bar 521 is threadedly connected to the lower end of a threaded sleeve 522, and the upper end of the threaded sleeve 522 is threadedly connected to the lower end of a second threaded steel bar 523; the secondary beam 40 has a through gap 43 at the position corresponding to each second threaded steel bar 523; the upper ends of the second threaded steel bars 523 respectively pass through the corresponding through gaps 43 and are fixedly connected to a pressing member 53, and the pressing member 53 is pressed on the corresponding secondary beam 40.

[0037] By adopting the first threaded steel bar 521 formed in one time during the pouring of the anchor pile 50, which is matched with the threaded sleeve 522 and the second threaded steel bar 523, the connection between the anchor pile 50 and the end of the secondary beam 40 is realized. It is convenient for disassembly and assembly, has high working efficiency, does not require welding throughout the process, and can reduce the safety risks brought by welding; the threaded sleeve 522 and the second threaded steel bar 523 can be recycled, reducing material use; the anchor pile 50 is formed by using the matched outer pipe 51, which is convenient for construction; and the counterweights placed on the secondary beam 40 can, firstly, increase the provided reaction force; secondly, can reduce the problem of insufficient tension provided by the anchor pile 50 at the end of the secondary beam 40.

[0038] Specifically, by implanting the first threaded steel bar 521 into the pipe piles (anchor piles 50) within a certain range around the compression pile (test pile 10), the first threaded steel bar 521, the threaded sleeve 522 and the second threaded steel bar 523 are connected and matched with the secondary beam 40 and related components such as counterweights to jointly form a reaction force system, so as to provide the reaction force required for the experiment.

[0039] Among them, regarding the relevant structural description of the main beam 30:

[0040] In an alternative solution of this embodiment, preferably, first placement blocks are arranged at the corresponding positions below the ends of the main beam 30. The first placement blocks placed below the ends of the main beam 30 can facilitate the main beam 30 to be hoisted to a designated position and keep a certain height from the ground, so as to ensure its stable placement above the jack 20.

[0041] Specifically, a pile head reinforcement structure 11 is provided at the top of the test pile 10 below the jack 20 below the main beam 30. This is an existing setting and will not be elaborated here.

[0042] Among them, regarding the related structure description of the secondary beam 40:

[0043] In an alternative solution of this embodiment, preferably, as Figure 1 shown, the secondary beam 40 includes a first secondary beam member 41 and a second secondary beam member 42; the first secondary beam member 41 and the second secondary beam member 42 are arranged in parallel, and a gap formed between the first secondary beam member 41 and the second secondary beam member 42 forms a through-gap 43. The secondary beam 40 is composed of the first secondary beam member 41 and the second secondary beam member 42. One of them can increase the pressure effect provided by a single secondary beam 40 at the position of the main beam 30, and it is convenient to form the through-gap 43, which is convenient for the threading and installation of the second threaded steel bar 523.

[0044] In an alternative solution of this embodiment, preferably, second placing blocks are provided at corresponding positions below the ends of the secondary beam 40. The second placing blocks can facilitate the lifting and placing of the secondary beam 40 and reduce the safety risk caused by the rolling of the secondary beam 40.

[0045] Among them, regarding the related structure description of the anchor pile 50:

[0046] Specifically, the anchor piles 50 are symmetrically distributed on both sides of the main beam 30.

[0047] Among them, regarding the connection structure description between the secondary beam 40 and the anchor pile 50:

[0048] In an alternative solution of this embodiment, preferably, as Figure 1 shown, the crimping member 53 is provided with a perforation. The upper ends of the second threaded steel bars 523 sequentially pass through the corresponding through-gaps 43 and perforations and are threadedly connected to a threaded fastening sleeve 534. The crimping member 53 is crimped on the secondary beam 40, and its structure is simple and convenient for installation and disassembly.

[0049] Specifically, in addition to the following structural components, the crimping member 53 can also be a component such as an I-beam, as long as it can press the corresponding secondary beam 40.

[0050] In an alternative solution of this embodiment, preferably, as Figure 1As shown in the figure, the crimping member 53 includes a first pressing plate 531, a first pressing tube 532, and a second pressing plate 533 arranged successively from bottom to top; the first pressing plate 531 is located above the secondary beam 40; both the first pressing plate 531 and the second pressing plate 533 are provided with openings communicating with the inside of the first pressing tube 532; the opening of the first pressing plate 531, the internal channel of the first pressing tube 532, and the opening of the second pressing plate 533 together form a through hole; the threaded fastening sleeve 534 is located above the second pressing plate 533, and the threaded fastening sleeve 534 is threadedly connected to the part of the second threaded steel bar 523 passing through the through hole. The crimping member 53 adopts the cooperation of the first pressing plate 531, the first pressing tube 532, and the second pressing plate 533, so as to increase the crimping effect on the corresponding position of the secondary beam 40 and improve the stability of the device.

[0051] Among them, regarding the relevant description of the counterweight:

[0052] In an alternative solution of this embodiment, preferably, the counterweight is a plurality of counterweight blocks. Using a plurality of counterweight blocks to form the counterweight is convenient for placement and removal.

[0053] Among them, regarding other relevant descriptions:

[0054] Specifically, the usage instructions are as Figure 2 shown:

[0055] (1) Rebar planting

[0056] After the prestressed pipe pile is formed (after the outer pipe 51 is installed), it is necessary to grout the core and reinforce the steel bars within a certain range of the pile top. Select the engineering piles (i.e., anchor piles 50) within a certain range around the test pile (i.e., test pile 10) for rebar planting. The rebar used for planting is threaded steel bar, with a depth greater than 2.5 m, and the number of the first threaded steel bars 521 implanted is selected according to the bearing capacity calculation. The specific steps are as follows: lowering the steel cage - lowering and fixing the first threaded steel bar 521 - grouting micro-expansive concrete.

[0057] Note: The steel cage is the structural reinforcement required for the anchor pile 50 itself, and each of the first threaded steel bars 521 in the middle is the steel bar required for connecting with the secondary beam 40 in the static load test, and is connected to the secondary beam 40 through each first threaded steel bar 521 in cooperation with the corresponding threaded sleeve 522 and the second threaded steel bar 523.

[0058] (2) Installing the reaction system

[0059] The reaction system includes anchor piles 50, jacks 20, composite steel beams (including main beams 30 and multiple secondary beams 40), etc. The specific installation steps are as follows: connecting the threaded sleeve 522 with the first threaded steel bar 521 - placing the jack 20 - placing the main beam 30 - connecting the upper part of the secondary beam 40 with the corresponding second threaded steel bar 523.

[0060] Specifically, as Figure 2As shown in the figure, when designing the static load test scheme of the prestressed pipe pile with embedded steel bars and anchor piles 50 by the reaction method, first determine the pile layout method, the number of embedded steel bars and the depth of embedded steel bars according to the needs, so as to determine the embedded steel bars of the reaction piles (that is, the structure of the anchor piles 50 is determined); it is completed through setting out and positioning, lowering the steel cage, inserting the corresponding first threaded steel bar 521 and pouring slightly expanded concrete; the next step is to install the reaction system: the second threaded steel bar 523 is connected to the first threaded steel bar 521 through the threaded sleeve 522, the jack 20 is placed on the test pile 10, the main beam 30 is placed on the jack 20, each secondary beam 40 is installed on the main beam 30, the connection between the corresponding positions at the ends of the secondary beams 40 and the second threaded steel bars 523 on the anchor piles 50 is made, the displacement meter is installed on the anchor piles 50, and the counterweights are placed on the secondary beams 40. After it is completed, the loading of the test pile 10 is started.

[0061] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A static load test device for prestressed pipe piles based on the reinforcement planting method, characterized in that: It includes a main beam, a jack, a test pile, multiple secondary beams, multiple anchor piles and counterweights; The jack is arranged at the upper end of the test pile, and the middle part of the main beam is located above the jack; A plurality of secondary beams are symmetrically arranged above the main beams on both sides of the test pile; each end of the secondary beam corresponds to an anchor pile; and the counterweights are evenly distributed on each secondary beam; The anchor pile comprises an outer tube, a steel cage and a plurality of connecting rods; the connecting rods comprise a first threaded steel bar, a threaded sleeve and a second threaded steel bar; the steel cage is located inside the outer tube; a portion of the lower end of each of the first threaded steel bars is located inside the steel cage, and the upper end of the first threaded steel bar is higher than the upper end of the outer tube; micro-expansive concrete is poured into the outer tube, and the micro-expansive concrete fixes the steel cage and the lower end of each of the first threaded steel bars; the upper end of each of the first threaded steel bars is threadedly connected to the lower end of a threaded sleeve, and the upper end of the threaded sleeve is threadedly connected to the lower end of a second threaded steel bar; The secondary beam has a through gap at a position corresponding to each of the second threaded steel bars; the upper end of each of the second threaded steel bars passes through the corresponding through gap and is fixedly connected to a crimping piece, and the crimping piece is crimped onto the corresponding secondary beam.

2. The static load test device for prestressed pipe piles based on the reinforcement planting method according to claim 1 is characterized in that: The secondary beam comprises a first beam member and a second beam member; The first beam member and the second beam member are arranged in parallel, and a gap between the first beam member and the second beam member forms the through gap.

3. The static load test device for prestressed pipe piles based on the reinforcing bar planting method according to claim 1 is characterized in that: The crimping piece is provided with a through hole, and the upper end of each of the second threaded steel bars passes through the corresponding through gap and the through hole in sequence and is threadedly connected with a threaded fastening sleeve.

4. The static load test device for prestressed pipe piles based on the reinforcing bar planting method according to claim 1 is characterized in that: First placement blocks are arranged at corresponding positions below the ends of the main beams.

5. The static load test device for prestressed pipe piles based on the reinforcing bar planting method according to claim 1 is characterized in that: Second placement blocks are arranged at corresponding positions below the ends of the secondary beams.

6. The static load test device for prestressed pipe piles based on the reinforcing bar planting method according to claim 1 is characterized in that: The counterweight object is a plurality of counterweight blocks.

7. The static load test device for prestressed pipe piles based on the reinforcing bar planting method according to claim 3 is characterized in that: The crimping member comprises a first pressing plate, a first pressing tube and a second pressing plate arranged in sequence from bottom to top; The first pressing plate is located above the secondary beam; the first pressing plate and the second pressing plate are both provided with openings communicating with the interior of the first pressing tube; The opening of the first pressing plate, the internal passage of the first pressing tube and the opening of the second pressing plate together form the through hole; The threaded fastening sleeve is located above the second pressing plate, and the threaded fastening sleeve is threadedly connected to the portion of the second threaded steel bar that passes through the through hole.

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