Anti-pulling test device for socketed pile

Abstract

The utility model discloses a rock-socketed pile pull-out test device which comprises a test model, two lower loading longitudinal beams, two pairs of jacks, two upper loading cross beams, four supporting columns, a loading disc and a plurality of small steel plates. The test model comprises a rock mass model and a pile body model which are integrally formed, and a pile body main rib is exposed out of the top surface of the pile body model; the two lower loading longitudinal beams are arranged on the top faces of the two sides of the rock mass model in a one-to-one correspondence mode. The two pairs of jacks are arranged on the top surfaces of the middle parts of the two lower loading longitudinal beams in a one-to-one correspondence manner; the two upper loading cross beams are respectively arranged on the top surfaces of the two pairs of jacks; the four supporting columns are arranged on the ground and are respectively supported at the two ends of the two upper loading cross beams; the loading disc is arranged between the middle parts of the two loading cross beams in a spanning manner, and the middle part of the loading disc is provided with through holes in one-to-one correspondence with main reinforcements of a pile body; and a plurality of small steel plates are welded between the upper parts of the pile body main reinforcements higher than the loading disc. The device is light in weight and convenient to operate and arrange, and can be used for carrying out a rock-socketed pile pull-out test more quickly.

Description

Technical Field

[0001] The utility model relates to a rock-embedded pile pull-out test device. Background Art

[0002] The test models used in the indoor test of rock-socketed pile pull-out resistance include rock models and rock-socketed pile models, among which the rock model is generally the key to the test. The preparation of rock models is mostly prepared by pouring cement, barite powder, fine aggregate, etc., and there are also rock materials directly used as rock models. The rock model that is directly poured has many advantages such as easy purchase and production, and the ability to customize the size, so it has become an important method for rock-socketed pile tests.

[0003] In the past, when casting rock models and rock-embedded pile models, wooden templates were often built for casting, and the rock model and the rock-embedded pile model were cast one after another. The advantage of this method is that the cost is low, but it is not convenient to use and takes a long time.

[0004] There is also a plan to use steel molds for casting, but less consideration is given to issues such as the transportation, dismantling, and subsequent testing of the model. When casting the test model, the convenience of the model test is not considered. Utility Model Content

[0005] The utility model aims to overcome the defects of the prior art and provide a rock-embedded pile pull-out test device, which is easy to operate and install and can more quickly perform the rock-embedded pile pull-out test.

[0006] The purpose of the utility model is achieved as follows: a rock-embedded pile pull-out test device, comprising a test model, two lower loading longitudinal beams, two pairs of jacks, two upper loading cross beams, four support columns, a loading plate and a plurality of small steel plates, wherein:

[0007] The test model includes an integrally formed rock model and a pile model located at the center of the top surface of the rock model, and the main reinforcement of the pile is exposed on the top surface of the pile model;

[0008] Two lower loading longitudinal beams are placed one by one on the top surfaces of both sides of the rock mass model;

[0009] Two pairs of jacks are arranged one by one on the middle top surfaces of the two lower loading longitudinal beams; the spacing between each pair of jacks is greater than the outer diameter of the pile model;

[0010] Two upper loading beams are mounted on the top surfaces of two pairs of jacks in a one-to-one correspondence;

[0011] Four supporting columns are placed on the ground and supported on both ends of the two upper loading beams one by one;

[0012] The loading plate is arranged between the middle parts of the two loading beams; the middle part of the loading plate is provided with through holes corresponding to the main reinforcements of the pile body, so that the upper part of the main reinforcements of the pile body can pass through the through holes of the loading plate;

[0013] A plurality of small steel plates are welded between the upper parts of the main reinforcements of the pile body which are higher than the loading plate.

[0014] The above-mentioned rock-embedded pile pull-out test device, wherein the test model is placed on a test model carrier, the test model carrier includes a steel base plate, a group of bottom mold support steels detachably mounted on the bottom surface of the steel base plate and having a length greater than the width of the steel base plate, two groups of side mold support steels located one-to-one at the front and rear sides of the rock model and detachably mounted one-to-one on the top surfaces of both ends of a group of bottom mold support steels, and a lifting frame installed between the tops of the two groups of side mold support steels; the lifting frame is a grid-shaped frame welded by a group of transverse steels and a group of longitudinal steels, the spacing of a group of transverse steels of the lifting frame is adapted to the spacing of the two groups of side mold support steels, so that the two ends of a group of transverse steels of the lifting frame are respectively connected to the tops of the two groups of side mold support steels by bolts one-to-one.

[0015] In the above-mentioned rock-embedded pile pull-out test device, a pair of lifting ears are evenly fixed on the top surface of the lifting frame.

[0016] In the above-mentioned rock-embedded pile pull-out test device, each of the lower loading longitudinal beams is composed of several steel sections.

[0017] The utility model is characterized in that the rock-embedded pile pull-out test device is easy to set up, and the test model is placed on the test model carrier, which is not only convenient for the test model transportation, but also convenient for the test operation, and the pull-out test can be carried out more quickly; it can be repeatedly used, has strong completeness, low cost, and the accuracy can meet the requirements of the test specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an elevation view of the rock-embedded pile pull-out test device of the utility model;

[0019] Figure 2 It is a plan view of the rock-embedded pile pull-out test device of the utility model;

[0020] Figure 3 It is a plan view of a loading plate in the rock-embedded pile pull-out test device of the utility model;

[0021] Figure 4 It is a vertical view of a loading plate in the rock-embedded pile pull-out test device of the utility model;

[0022] Figure 5 It is a perspective view of the test model during transportation after the test using the test device of the utility model. DETAILED DESCRIPTION

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] See also Figures 1 to 4 The utility model of the rock-embedded pile pull-out test device comprises a test model, two lower loading longitudinal beams 2, two pairs of jacks 3, two upper loading cross beams 4, four support columns 5, a loading plate 6 and a plurality of small steel plates 7, wherein:

[0025] The test model includes an integrally formed rock model 10 and a pile model 20 located at the center of the top surface of the rock model 10, and the pile main reinforcement 200 is exposed on the top surface of the pile model 20; the test model is placed on a test model carrier 1, and the test model carrier 1 includes a steel bottom plate 11, a group of bottom mold support steels 12 detachably mounted on the bottom surface of the steel bottom plate 11 and having a length greater than the width of the steel bottom plate 11, and two groups of side mold support steels 12 located one by one at the front and rear sides of the rock model 10 and detachably mounted one by one on the top surfaces of both ends of the group of bottom mold support steels 12. Steel 13 and a lifting frame 8 installed between the tops of the two sets of side formwork support steel 13; the lifting frame 8 is a grid-like frame welded by a set of transverse steel 81 and a set of longitudinal steel 82, so that the main reinforcement 200 of the pile body can pass through the lifting frame 8, and the spacing of the set of transverse steel 81 of the lifting frame 8 is adapted to the spacing of the two sets of side formwork support steel 13, so that the two ends of the set of transverse steel 81 of the lifting frame 8 are connected to the tops of the two sets of side formwork support steel 13 by bolts one by one; a pair of lifting ears (not shown in the figure) are evenly fixed on the top surface of the lifting frame 8 for lifting and transportation;

[0026] Two lower loading longitudinal beams 2 are placed one by one on the top surfaces of both sides of the rock mass model 10; each lower loading longitudinal beam 2 is composed of several steel sections;

[0027] Two pairs of jacks 3 are arranged one by one on the middle top surfaces of the two lower loading longitudinal beams 2; the spacing between each pair of jacks 3 is greater than the outer diameter of the pile model 20;

[0028] Two upper loading beams 4 are mounted on the top surfaces of two pairs of jacks 72 in a one-to-one correspondence;

[0029] Four support columns 5 are placed on the ground and are supported one by one at the two ends of the two upper loading beams 4;

[0030] The loading plate 6 is arranged between the middle parts of the two upper loading beams 4; the middle part of the loading plate 5 is provided with through holes 60 corresponding to the main reinforcement 200 of the pile body, so that the upper part of the main reinforcement 200 of the pile body can pass through the through holes 60 of the loading plate 6;

[0031] A plurality of small steel plates 7 are welded between the upper portions of the main reinforcement 200 of the pile body which are higher than the loading plate 6;

[0032] When the rock-embedded pile pull-out test device of the utility model is used for testing, the following steps are included:

[0033] Step 1: Set up the test device. The test device is set up in the following order:

[0034] 1) After the test model on the test model carrier 1 is hoisted to the test position, the hoisting frame 8 is first removed, and then two lower loading longitudinal beams 2 and two pairs of jacks 3 are hoisted and installed in sequence;

[0035] 2) First, place four support columns 5 on the ground at the test location, then hoist and install two upper loading beams 4, and adjust the heights of the two pairs of jacks 3 so that the top surfaces of the two pairs of jacks 3 are in contact with the bottom surfaces of the two upper loading beams 4;

[0036] 3) Lift and install the loading plate 6, and pass the main reinforcement 200 of the pile body through the through hole 60 of the loading plate 6;

[0037] 4) Welding the small steel plate 7 to fix the main reinforcement 200 of the pile body to the loading plate 6;

[0038] Step 2, test according to relevant regulations, that is, load the two pairs of jacks 3 step by step, the two pairs of jacks 3 lift the two upper loading beams 4 upward, apply a uniform upward load to the pile main reinforcement 200 through the loading plate 6, that is, apply a uniform upward load to the pile model 20, and form equal reaction forces on the two pairs of jacks 3 at the same time; when the pile model 20 is pulled out of the rock model 10, record the value of the reaction force on the jacks at this time, which can be calculated according to the length of the upper loading beam 4 and the length of the lower loading longitudinal beam 2 according to the moment formula, and the pull-out bearing capacity of the pile model 20 can be obtained;

[0039] Step 3: After the test is completed, first cut off the main reinforcement 200 and the small steel plate 7 of the pile body, then lift and remove the loading plate 6, two upper loading beams 4, two pairs of jacks 3, two lower loading longitudinal beams 2 and four support columns 5 in sequence, and then reinstall the lifting frame 8 between the tops of the two sets of side form support steel 13 (see Figure 5 ), transport the test model to a storage location to await crushing.

[0040] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A rock-embedded pile pullout test device, comprising a test model, two lower loading longitudinal beams, two pairs of jacks, two upper loading cross beams, four support columns, a loading plate and a plurality of small steel plates, characterized in that: The test model includes an integrally formed rock model and a pile model located at the center of the top surface of the rock model, and the main reinforcement of the pile is exposed on the top surface of the pile model; Two lower loading longitudinal beams are placed one by one on the top surfaces of both sides of the rock mass model; Two pairs of jacks are arranged one by one on the middle top surfaces of the two lower loading longitudinal beams; the spacing between each pair of jacks is greater than the outer diameter of the pile model; Two upper loading beams are mounted on the top surfaces of two pairs of jacks in a one-to-one correspondence; Four supporting columns are placed on the ground and supported on both ends of the two upper loading beams one by one; The loading plate is arranged between the middle parts of the two loading beams; the middle part of the loading plate is provided with through holes corresponding to the main reinforcements of the pile body, so that the upper part of the main reinforcements of the pile body can pass through the through holes of the loading plate; A plurality of small steel plates are welded between the upper parts of the main reinforcements of the pile body which are higher than the loading plate.

2. The rock-embedded pile pull-out test device according to claim 1, characterized in that: The test model is placed on a test model carrier, which includes a steel base plate, a group of bottom mold support steels detachably mounted on the bottom surface of the steel base plate and having a length greater than the width of the steel base plate, two groups of side mold support steels which are located one-to-one at the front and rear sides of the rock model and are detachably mounted one-to-one on the top surfaces of both ends of a group of bottom mold support steels, and a lifting frame installed between the tops of the two groups of side mold support steels; the lifting frame is a grid-shaped frame welded from a group of transverse steels and a group of longitudinal steels, the spacing of a group of transverse steels of the lifting frame is adapted to the spacing of the two groups of side mold support steels, so that the two ends of a group of transverse steels of the lifting frame are respectively connected to the tops of the two groups of side mold support steels by bolts one-to-one.

3. The rock-embedded pile pull-out test device according to claim 2, characterized in that: A pair of lifting ears are evenly fixed on the top surface of the lifting frame.

4. The rock-embedded pile pull-out test device according to claim 1, characterized in that: Each of the lower loading longitudinal beams is composed of a number of steel sections.

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