CN215374753U

CN215374753U - Device for preparing pile-rock interface compression shear sample

Info

Publication number: CN215374753U
Application number: CN202121997861.3U
Authority: CN
Inventors: 张振华; 张丹; 余跃程; 奚邦禄; 徐国娟; 殷永高
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2021-12-31
Anticipated expiration: 2031-08-23

Abstract

The utility model discloses a device for preparing a pile-rock interface compression shear sample, which relates to the technical field of pile-rock contact surfaces of rock-socketed piles in geotechnical engineering and mainly aims to solve the problem that the existing device for preparing the pile-rock interface compression shear sample has larger errors, and comprises a working platform, a flat plate type attached vibrator, a base, an A steel template, a B steel template, a sealing cover, an air compressor and a gas transmission pipeline, wherein the base and the sealing cover are respectively provided with four grooves and eight fixing holes, sealing strips are embedded in the grooves, the protruding parts at the bottoms and the tops of the A steel template and the B steel template are respectively embedded into the grooves, the working platform, the base, the A steel template, the B steel template and the sealing cover are connected through a transverse fixing rod and a vertical fixing rod in a combined manner, the device has good tightness, is simple and easy to operate, and reduces operation links, which is beneficial to obtain more accurate results.

Description

Device for preparing pile-rock interface compression shear sample

Technical Field

The utility model relates to the technical field of rock-socketed pile-rock contact surfaces in geotechnical engineering, in particular to a device for preparing a pile-rock interface compression shear sample.

Background

The indoor compression shear test of the structural surface is a test which is very widely applied. At present, in the preparation process of a plurality of pile-rock interface compression shear samples, concrete pouring is directly carried out on rock samples obtained on site in a model box.

However, the pile-rock interface compression shear sample preparation method does not consider the pile-rock interface roughness and the concrete permeability to the surrounding rock at different pile depth positions in a certain grouting pressure pouring process, because for rock-embedded piles which are complex in geological conditions, bear heavy loads and have deep rock-embedded depths, due to the difference of the geometrical shapes of the construction interfaces, pile foundations embedded in deep rock stratums can form rough surfaces with different geometrical shapes at the pile-rock interfaces at different pile depth positions, at the moment, under the action of a certain grouting pressure, the stratum lithology is changed along with the change of the pile depth positions, and the permeability of the concrete to the surrounding rock is also different, so that the pile-rock interface compression shear sample prepared by the traditional method has larger errors in the strength parameters, deformation parameters and real conditions of the pile-rock interfaces calculated by the compression shear test, the pile side friction resistance value of the rock-socketed pile in the actual stress process cannot be well reflected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for preparing a pile-rock interface compression shear sample, which solves the problems in the background technology.

In order to achieve the above purpose, the present application provides the following technical solutions:

the utility model provides a device for sample preparation is cut in stake-rock interface pressure, includes work platform, flat attached vibrator, base, A steel form, B steel form, sealed lid, air compressor and gas transmission pipeline, four recesses and eight fixed orificess have all been seted up to base and sealed covering, the embedding has the sealing strip in the recess, the protruding position at the bottom and the top of A steel form and B steel form all imbeds the inside of recess, work platform, base, A steel form, B steel form and sealed lid are through horizontal dead lever and vertical dead lever built-up connection.

As a further aspect of the present application: four positioning holes are formed in the top of the working platform, the welding type right-angle fixator is welded at the bottom of the working platform, and the flat plate type attached vibrator is fixedly connected with the welding type right-angle fixator through a bottom expanding bolt.

As a still further aspect of the present application: the central position of sealed lid is equipped with inlet port and manometer, be provided with the atmospheric pressure valve on the inlet port, the atmospheric pressure valve is used for controlling gaseous transport and closes, and the manometer is used for observing the size of atmospheric pressure, and inlet port and gas transmission pipeline pass through hoop closed connection.

As a still further aspect of the present application: and the other end of the gas transmission pipeline is connected with an air compressor and is used for providing the penetration force of the liquid concrete at different pile depth positions to the surrounding rock.

As a still further aspect of the present application: the draw-in groove has been seted up at the inner wall central point of A steel form, the mode that has first variable size steel form and second variable size steel form through the card income in the draw-in groove is in order to realize the purpose of the sample preparation of not unidimensional stake-rock interface pressure shear, B template bulge on the B steel form is embedded into in the draw-in groove, and six fixed orificess have all been seted up to the both sides of A steel form, it has horizontal dead lever to run through in the fixed orifices, and the both ends of dead lever are through expanding the purpose of end bolt fastening's mode in order to reach the stability of guaranteeing the mold box and gas tightness.

As a still further aspect of the present application: the draw-in groove has been seted up at the inner wall center part of B steel form, the mode that has first variable size steel form and second variable size steel form through the card income in the draw-in groove is in order to reach the not mesh of not unidimensional stake-rock interface pressure shear sample preparation, be provided with B template bulge position on the B steel form, the mode that B template bulge position is through embedding in the draw-in groove of A steel form is in order to reach the purpose of guaranteeing the gas tightness of mold box, just B steel form outside is provided with the cross connection accessory, in the A template rectangle fixed orifices has been seted up on the A steel form, the cross connection accessory is through the purpose that the mode of interpolation connection in A template rectangle fixed orifices is in order to reach stable model box.

As a still further aspect of the present application: the rubber membrane is embedded in the mold box, and the rubber membrane is horizontally placed at the bottom of the mold box to achieve the purpose of preventing the upper surface of concrete from being uneven.

Compared with the prior art, the beneficial effects of this application are:

1. the lithology and the hole wall roughness of different stratums and the permeability of liquid concrete to surrounding rock under certain grouting pressure can be considered, the strength parameter and the deformation parameter of a pile-rock interface can be accurately calculated by using a pile-rock interface compression shear test sample obtained by the equipment after demolding and curing in an indoor compression shear test, and the pile side friction resistance value of the rock-socketed pile in the actual stress process can be well reflected, so that the mechanical property of the pile-rock interface can be accurately revealed;

2. pile-rock contact surface samples with different sizes can be prepared according to the requirement of test sizes, and the obtained samples can be directly used for indoor compression shear tests after being maintained without cutting adjustment of the sizes of the samples at the later stage, so that the interference on the samples is reduced, and the error of test results is smaller;

3. the device has the advantages of good tightness, simplicity, easiness in operation and low cost, and the operations of concrete pouring, stirring vibration, pressurization and the like are integrated on one device, so that the number of operation links is reduced, and more accurate results can be obtained;

4. the method has the characteristic of wide application range, can be used for preparing pile-rock interface compression shear samples at different pile depth positions under different engineering geological conditions, and can be widely applied to compression shear tests of concrete rock structural surfaces.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for preparing a pile-rock interface compression shear sample according to the present invention

FIG. 2 is a cross-sectional view of an apparatus for pile-rock interface compression shear sample preparation in accordance with the present invention

FIG. 3 is a schematic structural diagram of a work platform according to the present invention

FIG. 4 is a schematic view showing the installation of the flat plate type attached vibrator of the present invention

FIG. 5 is a schematic view of the structure of the base of the present invention

FIG. 6 is a schematic structural view of the A steel form of the present invention

FIG. 7 is a front view of the A steel form of the present invention

FIG. 8 is a schematic structural view of a B-steel form of the present invention

FIG. 9 is a front view of the B-steel form of the present invention

FIG. 10 is a schematic view showing the structure of a variable-size mold box according to the present invention

FIG. 11 is a schematic view of the structure of the sealing cap of the present invention

FIG. 12 is a bottom view of the sealing cap of the present invention

In the figure: 1-working platform, 2-base, 3-rock sample, 4-concrete, 5-vertical fixing rod, 6-sealing cover, 7-bottom expanding nut, 8-sealing strip, 9-air inlet hole, 10-steel template projecting part, 11-acrylic plate, 12-rubber membrane, 13-clamping groove, 14-flat plate attached vibrator, 15-welding type right angle fixer, 16-hoop, 17-pressure gauge, 18-air pressure valve, 19-air pipeline, 20-concrete chamber, 21-fixing hole, 22-groove, 23-staggered connection accessory, 24-first variable size steel template, 25-second variable size steel template, 27-A steel template, 28-B steel template, 29-A template groove, 30-transverse fixing rods, 31-B template protruding parts and 32-A template rectangular fixing holes.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1 to 3, the present embodiment provides a device for preparing a pile-rock interface compression shear sample, including a working platform 1, a flat plate type attached vibrator 14, a base 2, an a steel form 27, a B steel form 28, a sealing cover 6, an air compressor 20, and an air pipeline 19, where the base 2 and the sealing cover 6 are both provided with four grooves 22 and eight fixing holes 21, a sealing strip 8 is embedded in the groove 22, protruding portions 10 at the bottom and the top of the a steel form 27 and the B steel form 28 are both embedded in the groove 22, and the working platform 1, the base 2, the a steel form 27, the B steel form 28, and the sealing cover 6 are connected in combination by a transverse fixing rod 30 and a vertical fixing rod 5.

Referring to fig. 8, further, the top of the working platform 1 is provided with four positioning holes 21 for placing a fixed mold type box, the bottom of the working platform is welded with a welded right angle fixer 15, the flat plate type attached vibrator 14 is fixedly connected with the welded right angle fixer 15 through a flared bolt and is connected with the working platform 1 into a whole, the flat plate type attached vibrator 14 is tightly attached to the bottom of the working platform 1, and when the flat plate type attached vibrator 14 mechanically vibrates, the cast-in-place concrete 4 in the mold box can be compacted, so that the residual air in the concrete 4 is removed.

Referring to fig. 5, further, an air inlet 9 and a pressure gauge 17 are disposed at a center position of the sealing cover 6, an air pressure valve 18 is disposed on the air inlet 9, the air pressure valve 18 is used for controlling the delivery and closing of air, the pressure gauge 17 is used for observing the air pressure, and the air inlet 9 and the air pipe 19 are hermetically connected through a hoop 16.

Referring to fig. 5, further, the other end of the gas transmission pipeline 19 is connected to an air compressor 20 for providing the penetration force of the liquid concrete 4 to the surrounding rock 3 at different pile depth positions.

Referring to fig. 5, as an embodiment of the present application, a clamping groove 13 is formed in a central portion of an inner wall of the steel form a 27, a first variable-size steel form 24 and a second variable-size steel form 25 are clamped in the clamping groove 13 to achieve a purpose of preparing pile-rock interface compression shear samples of different sizes, a protruding portion 31 of the steel form B on the steel form B28 is embedded into the clamping groove 29, six fixing holes 21 are formed in both sides of the steel form a 27, a transverse fixing rod 30 penetrates through the fixing holes 21, and two ends of the fixing rod 30 are fixed by bottom-expanding bolts to achieve a purpose of ensuring stability and air tightness of a mold box.

Referring to fig. 1 to 9, further, a clamping groove 13 is formed in a central portion of an inner wall of the B steel form 28, the clamping groove 13 is clamped with a first variable-size steel form 24 and a second variable-size steel form 25 to achieve the purpose of preparing pile-rock interface compression shear samples of different sizes, a B form protruding portion 1 is arranged on the B steel form 28, the B form protruding portion 31 is embedded into a clamping groove 29 of the a steel form to achieve the purpose of ensuring the airtightness of the mold box, a cross-connection fitting 23 is arranged on an outermost side of the B steel form 28, an a form rectangular fixing hole 32 is formed in the a steel form 27, and the cross-connection fitting 23 is connected into the a form rectangular fixing hole 32 in an insertion manner to achieve the purpose of stabilizing the mold box.

Referring to fig. 1 to 5, further, a rubber membrane 12 is embedded inside the mold box, and the rubber membrane 12 is horizontally placed on the bottom of the mold box to prevent the unevenness of the upper surface of the concrete.

When the device is used, firstly, a base 2 is placed on a working platform 1, the lower protruding parts of four steel templates are sequentially clamped in clamping grooves 13 of the base 2, which are provided with sealing strips 8, after the peripheries of the steel templates are combined, the steel templates are firmly fixed through a transverse fixing rod 30 and a vertical fixing rod 5, and a flat plate type attached vibrator 14 is fixed on a welding type right-angle fixer 15 at the bottom of the working platform 1 through an expanding bolt; and then putting the prepared rock sample 3 with different pile depth positions with a certain size into a model box, pouring the prepared concrete 4 on the upper part of the rock sample 3, turning on a switch of the flat plate type attached vibrator 14 to work for a certain time until the surface of the concrete 4 generates floating slurry without bubbles and sinking, and turning off the flat plate type attached vibrator 14. At the moment, the rubber membrane 12 is embedded into a model box, and in order to prevent the uneven surface of concrete caused by the action of local air pressure at the moment of pressurization, an acrylic plate 11 is horizontally placed at the bottom of the rubber membrane 12; then the sealing cover 6 is installed on the four steel templates, the installation method is the same as that of the base and the steel templates, the bottom expanding nut 7 on the vertical fixing rod 5 is screwed, the air inlet 9 on the sealing cover 6 is hermetically connected with the air conveying pipeline 19 through the hoop 16, and pressurization is waited; the air compressor 20 is opened to regulate the pressure, the pressure gauge 17 is used for observing the stable reading, the air pressure valve 18 is opened, and the pressure is transmitted to the concrete 4; and finally, after the pile-rock interface compression shear test sample reaches the final setting time of the standard requirement, removing the model box, maintaining for a certain time, and after the strength reaches the standard requirement, directly using the model box for indoor compression shear tests and the like of the concrete 4 and rock interface. The pile-rock interface compression shear sample obtained by the device can simulate the field stress environment more truly, and the deformation parameter and the strength parameter of the pile-rock interface can be more accurately obtained when the pile-rock interface compression shear sample obtained by the device is used in a compression shear test.

It should be noted that, although the present specification describes embodiments, each embodiment does not include only a single technical solution, and such description of the specification is only for clarity, and those skilled in the art should take the specification as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art, and the above-mentioned embodiments only express the preferred embodiments of the technical solutions, and the description thereof is more specific and detailed, but should not be construed as limiting the scope of the claims of the technical solutions. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications, improvements and substitutions can be made, which are all within the protection scope of the present technical solution.

Claims

1. The device for preparing the pile-rock interface compression shear sample is characterized by comprising a working platform, a flat plate type attached vibrator, a base, an A steel template, a B steel template, a sealing cover, an air compressor and an air conveying pipeline, wherein the base and the sealing cover are respectively provided with four grooves and eight fixing holes, sealing strips are embedded into the grooves, the bottom and the top of the A steel template and the top of the B steel template are respectively embedded into the grooves, and the working platform, the base, the A steel template, the B steel template and the sealing cover are connected in a combined mode through transverse fixing rods and vertical fixing rods.

2. The device for preparing the pile-rock interface compression shear test sample according to claim 1, wherein the top of the working platform is provided with four positioning holes, the bottom of the working platform is welded with a welded right-angle fixer, and the flat plate type attached vibrator is fixedly connected with the welded right-angle fixer through a flared bolt.

3. The device for preparing the pile-rock interface compression shear sample according to claim 1, wherein the center of the sealing cover is provided with an air inlet hole and a pressure gauge, the air inlet hole is provided with an air pressure valve, the air pressure valve is used for controlling the air delivery and closing, the pressure gauge is used for observing the air pressure, and the air inlet hole is hermetically connected with the air transmission pipeline through a hoop.

4. The device for preparing the pile-rock interface compression shear test sample according to claim 3, wherein an air compressor is connected to the other end of the air transmission pipeline and is used for providing the penetration force of the liquid concrete to the surrounding rock at different pile depth positions.

5. The device for preparing the pile-rock interface compression shear sample according to claim 1, wherein a clamping groove is formed in the central part of the inner wall of the steel template A, a first variable-size steel template and a second variable-size steel template are clamped in the clamping groove to realize the preparation of the pile-rock interface compression shear sample with different sizes, a protruding part of the steel template B on the steel template B is embedded into the clamping groove, six fixing holes are formed in two sides of the steel template A, transverse fixing rods penetrate through the fixing holes, and the two ends of each fixing rod are fixed through bottom expanding bolts to achieve the purpose of ensuring the stability and the air tightness of the model box.

6. The device for preparing the pile-rock interface compression shear sample according to claim 5, characterized in that a clamping groove is formed in the center of the inner wall of the B steel formwork, a first variable-size steel formwork and a second variable-size steel formwork are clamped in the clamping groove to achieve the purpose of preparing pile-rock interface compression shear samples of different sizes, a B formwork protruding portion is arranged on the B steel formwork and embedded into the clamping groove of the A steel formwork to achieve the purpose of guaranteeing the air tightness of the model box, a staggered connection accessory is arranged on the outermost side of the B steel formwork, a formwork rectangular fixing hole is formed in the A steel formwork, and the staggered connection accessory is connected in the A formwork rectangular fixing hole in an inserting mode to achieve the purpose of stabilizing the model box.

7. The device for preparing the pile-rock interface compression shear sample according to claim 6, wherein a rubber membrane is embedded inside the mold box, and the rubber membrane achieves the purpose of preventing the upper surface of concrete from being uneven by horizontally placing an acrylic plate at the bottom.