CN219386433U

CN219386433U - Counter-force device for expansion mechanical anchor pile

Info

Publication number: CN219386433U
Application number: CN202320154406.XU
Authority: CN
Inventors: 孙晓春; 崔培培
Original assignee: Shandong Jinliyuan Engineering Quality Testing Co ltd
Current assignee: Shandong Jinliyuan Engineering Quality Testing Co ltd
Priority date: 2022-09-08
Filing date: 2023-02-08
Publication date: 2023-07-21
Anticipated expiration: 2033-02-08

Abstract

The utility model discloses an expansion mechanical anchor pile counter-force device, which relates to the technical field of foundation pile detection of constructional engineering and comprises a middle plate, side plates, T-shaped ends and jacks, wherein the two side plates are respectively positioned at the left side and the right side of the middle plate, are symmetrically arranged by taking the middle plate as a center, are arranged in parallel, and are connected through a plurality of inclined and parallel chain rods; the lower end of the chain rod is hinged with the middle plate, the upper end of the chain rod is hinged with the side plate, and the rotation angle of the chain rod relative to the middle plate is smaller than 90 degrees; the T-shaped end is fixedly arranged at the upper end of the middle plate, the upper ends of the two side plates are respectively provided with a horizontal flat plate support, the two jacks are respectively arranged on one flat plate support, and the upper ends of the two jacks are connected with the cross rod of the T-shaped end; the device has simple structure, is convenient for transportation, and greatly reduces transportation and hoisting cost. The pile testing device is novel in structure and capable of being repeatedly utilized, effectively reduces pile testing cost and shortens pile testing period.

Description

Counter-force device for expansion mechanical anchor pile

Technical Field

The utility model relates to the technical field of foundation pile detection in constructional engineering, in particular to an expansion machinery anchor pile counter-force device.

Background

The construction engineering foundation pile compression-resistant bearing capacity detection commonly adopts a static load test method, which is a currently accepted test method for detecting the foundation pile vertical compression-resistant bearing capacity directly and reliably.

According to the national regulations of the existing building foundation pile detection technical specification, the single-pile vertical compression-resistant static load test is a test method for applying vertical pressure on the top of a test pile step by step, observing the settlement displacement generated by the top of the test pile along with time, and determining the single-pile vertical compression-resistant bearing capacity of the corresponding test pile. According to the construction site conditions, two loading counterforce devices are commonly used at present, wherein one loading counterforce device is an anchor pile counterforce device; one is a platen counter force device (stacking method).

The anchor pile counter force device provides the upward pulling resistance required by the static load test by the anchor pile, so the anchor pile is a pulling resistance pile which is independently designed according to the bearing capacity of the anchor pile required by the static load test and the physical parameters of soil around the anchor pile, has certain pile length, diameter, reinforcement and the like so as to meet the pulling resistance bearing capacity requirement, and is different from an engineering compression pile, and is generally designed into a concrete filling pile with longer pile length and larger diameter in order to improve the pulling resistance bearing capacity of the anchor pile. The anchor pile has the advantages of safety, reliability and high cost. If special anchor piles are arranged for the test piles, after the foundation pile detection is completed, the anchor piles are abandoned and cannot be reused, so that the foundation pile detection cost can be greatly increased. If the pressed engineering pile is used as the anchor pile, the engineering anchor pile is subjected to upward tension to generate upward displacement, if the upward displacement of the anchor pile is overlarge, the pile bottom is suspended, after pile measurement is completed, the anchor pile is used as the engineering pile to bear long-term pressure, the pile bottom is suspended to cause insufficient compressive bearing capacity, and engineering safety accidents are easy to generate. (the existing anchor pile reaction device is shown in FIG. 1)

The counter force device of the ballast platform is also called a stacking method, namely a plurality of ballast blocks are stacked on the top of a test pile, the ballast blocks are generally cuboid concrete blocks or iron blocks, the bottoms of the ballast blocks are support platforms formed by steel beams, and the platform device for providing counter force by utilizing the ballast of the stacking blocks is called the counter force device of the ballast platform. The greater the weight of the upper part of the building engineering, the greater the pile foundation bearing capacity, and the greater the number of weight blocks required for detecting the pile foundation bearing capacity, the weight blocks need to be transported for a plurality of times by heavy vehicles and are required to be matched and hoisted by a crane, so that the pile foundation detection and transportation cost is high and the period is long. If the counter-force device of the ballast platform is positioned on the soft soil foundation, once the counter-force device is inclined, the ballast platform is easy to collapse, and safety accidents are generated. (the counter-force device of the ballast platform is shown in FIG. 2)

Disclosure of Invention

Aiming at the problems that the existing anchor pile counterforce device cannot be reused, the cost is high, and the engineering pile as an anchor pile has a certain influence on the pile body quality and bearing capacity; the counter force device of the compression weight platform has the advantages of being high in transportation and hoisting cost, long in period, unsafe to use, and capable of being repeatedly utilized, shortening pile measuring period, and being simple to operate and safe to use.

The technical scheme of the utility model is as follows: the counter-force device of the expansion mechanical anchor pile comprises a middle plate, side plates, T-shaped ends and jacks, wherein the two side plates are respectively positioned at the left side and the right side of the middle plate, are symmetrically arranged by taking the middle plate as a center, are arranged in parallel, and are connected through a plurality of inclined and mutually parallel chain rods; the lower end of the chain rod is hinged with the middle plate, the upper end of the chain rod is hinged with the side plate, and the rotation angle of the chain rod relative to the middle plate is smaller than 90 degrees;

the T-shaped end is fixedly arranged at the upper end of the middle plate, the upper ends of the two side plates are respectively provided with a horizontal flat plate support, the two jacks are respectively arranged on one flat plate support, and the upper ends of the two jacks are connected with the cross rod of the T-shaped end.

Preferably, the chain rods on two sides of the middle plate are symmetrically arranged with the middle plate as a center.

Preferably, the middle plate and the side plates are provided with double-lug plates hinged with the ends of the chain rods, and limiting blocks for limiting the rotation angles of the chain rods are arranged on the outer sides of the double-lug plates.

Preferably, the middle plate and the side plates are steel plates, the middle plate is a flat plate or an I-shaped plate, the side plates are flat plates, groove-shaped plates or I-shaped plates, and short steel bars for increasing roughness are arranged on the outer walls of the side plates.

Compared with the prior art, the utility model has the following advantages:

the device has simple structure, is convenient for transportation and hoisting, and greatly reduces the transportation and hoisting cost; the pile-measuring device is novel in structure, after pile measurement is completed, the pile-inserting machine can simultaneously lift the side plates at two sides, and as soil body moves towards two sides, when the side plates at two sides are lifted, the two side plates shrink relative to the middle plate due to the action of the chain rod, so that the pile-measuring device is easily pulled out of the ground for later recycling, the pile-measuring cost is effectively reduced, and the pile-measuring period is shortened; the device is simple and convenient to operate, can be particularly suitable for soft soil areas, and can avoid collapse of a weighting platform caused by foundation instability, so that the device is safer.

Drawings

FIG. 1 is a schematic structural view of a conventional anchor pile reaction force device;

FIG. 2 is a schematic structural view of a counter-force device of a ballast platform;

FIG. 3 is a schematic perspective view of the present utility model;

FIG. 4 is an enlarged view of FIG. 1 at A;

fig. 5 is a schematic view of the usage state of the present utility model.

In the figure: 1. the device comprises a middle plate, 2, side plates, 3, a chain rod, 4, a T-shaped end, 5, a flat plate support, 6, a jack, 7, a double-lug plate, 8 and a limiting block.

Detailed Description

The utility model is further illustrated by the following examples in connection with the accompanying drawings.

Example 1

Referring to fig. 3, an expansion mechanical anchor pile reaction device comprises a middle plate 1, side plates 2, a T-shaped end 4 and a jack 6, wherein the middle plate 1 and the side plates 2 are steel plates, the two side plates 2 are respectively positioned at the left side and the right side of the middle plate 1, are symmetrically arranged by taking the middle plate 1 as a center, are arranged in parallel, and are connected through a plurality of inclined and parallel chain rods 3; the lower end of the chain rod 3 is hinged with the middle plate 1, the upper end of the chain rod is hinged with the side plate 2, and the rotation angle of the chain rod relative to the middle plate 1 is smaller than 90 degrees;

the T-shaped end 4 is fixedly arranged at the upper end of the middle plate 1, the upper ends of the two side plates 2 are respectively provided with a horizontal flat plate support 5, the two jacks 6 are respectively arranged on one flat plate support 5, and the upper ends of the two jacks are respectively connected with the cross rod of the T-shaped end 4.

The middle plate 1 is a flat plate or an I-shaped plate, the side plate 2 is a flat plate, a groove-shaped plate or an I-shaped plate, and the outer wall of the side plate 2 is provided with a short steel bar for increasing the roughness.

In more detail, the links 3 on both sides of the intermediate plate 1 are symmetrically arranged with the intermediate plate 1 as a center.

During construction, the middle plate 1 is clamped by the steel sheet pile inserting machine and inserted into the soil, and the two side plates 2 are brought into the soil together. After the device enters the soil, the jacks 6 at the top ends of the side plates 2 at the two sides are started to push the T-shaped end head 4 and the middle plate 1 upwards; the side plates 2 on both sides are pushed downward by the reaction force. Due to the supporting effect of the chain bar 3, the side plates 2 at the two sides have a tendency to expand outwards; along with the increase of the jack 6, the outward expansion force of the side plates 2 at the two sides is gradually increased, the soil at the two sides of the device is compacted and compacted, the friction force between the side plates 2 at the two sides and the soil is larger, according to the balance of the forces, when the jacking force of each jack 6 reaches 300 tons, the horizontal thrust force born by the soil is about 300 tons, the friction coefficient between the soil and the steel plate is considered to be 0.5, the friction force is 150 tons, and the sum of the friction forces which can be provided is 150 multiplied by 2=300 tons due to the soil compaction of the two side plates 2. Thus, an anchor pile with a vertical bearing capacity of 300 tons is formed, so that the anchor pile can be used for engineering pile measurement; the pile-finding schematic diagram is shown in fig. 5.

After pile measurement is completed, the pile inserting machine can simultaneously lift the side plates 2 on two sides, and as soil body is displaced towards two sides, when the side plates 2 on two sides are lifted, the mechanical anchor pile can generate shrinkage trend, so that the device is pulled out of the ground easily, and the device can be reused later.

The device has simple structure, is convenient for transportation and hoisting, and greatly reduces the transportation and hoisting cost; the pile testing device is novel in structure and capable of being repeatedly used, pile testing cost is effectively reduced, and pile testing period is shortened; the device is simple and convenient to operate, is suitable for soft soil foundations, and is safe to use.

Example two

As a preferred embodiment of the present utility model, this embodiment adds a stopper for the chain bar 3 on the basis of the first embodiment, specifically:

referring to fig. 4, in this embodiment, both the middle plate 1 and the side plate 2 are provided with a double-lug plate 7 for hinging with the end of the chain bar 3, and the outer side of the double-lug plate 7 is provided with a limiting block 8 for limiting the rotation angle of the chain bar 3; the limiting block 8 limits the displacement distance of the two side plates 2 relative to the middle plate 1 by limiting the rotation angle of the chain rod 3.

The principle of the device is as follows:

1) The device consists of three steel plates which are connected with each other through a rotatable chain rod 3; during construction, the device is required to be driven into the soil by the pile inserting machine, and the operation is convenient.

2) According to friction force f=u×fn

Before pile measurement, when the jack 6 at the top of the expansion mechanical anchor pile is loaded, the middle plate 1 generates upward displacement, the side plates 2 at the two sides are static relative to soil, the action of the chain rod 3 enables the vertical relative displacement between the steel plates to generate transverse expansion, and the contact surface pressure fn is also gradually increased, so that larger friction force can be generated.

3) When the anchor pile is subjected to upward vertical force during pile measurement, the middle plate 1 moves upwards, and the lateral expansion generated by the side plates 2 at the two sides is larger, so that the friction force is larger.

4) After pile measurement is completed, the pile inserting machine can simultaneously lift the side plates 2 at two sides, and the soil body generates displacement to two sides, so that when the side plates 2 at two sides are lifted, the two side plates 2 shrink relative to the middle plate 1 due to the action of the chain rod 3, and the pile measuring machine is easily pulled out of the ground so as to be reused later.

The present utility model is not limited to the above-described embodiments, and various changes may be made without departing from the spirit of the present utility model within the knowledge of those skilled in the art, and the contents after the changes still fall within the scope of the present utility model.

Claims

1. An expansion machinery anchor pile reaction device which is characterized in that: the lifting jack comprises a middle plate, side plates, T-shaped ends and lifting jacks, wherein the two side plates are respectively positioned at the left side and the right side of the middle plate, are symmetrically arranged by taking the middle plate as a center, are arranged in parallel, and are connected through a plurality of inclined and parallel chain rods; the lower end of the chain rod is hinged with the middle plate, the upper end of the chain rod is hinged with the side plate, and the rotation angle of the chain rod relative to the middle plate is smaller than 90 degrees;

2. An expansion mechanical anchor pile reaction device according to claim 1, wherein: the chain rods on two sides of the middle plate are symmetrically arranged by taking the middle plate as a center.

3. An expansion mechanical anchor pile reaction device according to claim 1, wherein: the middle plate and the side plates are respectively provided with a double-lug plate hinged with the end of the chain rod, and the outer sides of the double-lug plates are provided with limiting blocks for limiting the rotation angle of the chain rod.

4. An expansion mechanical anchor pile reaction device according to claim 1, wherein: the middle plate and the side plates are steel plates, the middle plate is a flat plate or an I-shaped plate, the side plates are flat plates, groove-shaped plates or I-shaped plates, and short steel bars for increasing roughness are arranged on the outer walls of the side plates.