CN210141128U

CN210141128U - Test device for simulating pipe curtain underground excavation

Info

Publication number: CN210141128U
Application number: CN201920725085.8U
Authority: CN
Inventors: 孙廉威; 韦实; 梁荣柱; 王新新
Original assignee: China University of Geosciences; Shanghai Construction Group Co Ltd
Current assignee: China University of Geosciences; Shanghai Construction Group Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-03-13
Anticipated expiration: 2029-05-21

Abstract

The utility model provides a simulation pipe curtain undercut's test device belongs to underground space development technical field, and is experimental through the little scale of pipe curtain undercut, provides theoretical basis for pipe curtain undercut technique. The test device for simulating the pipe curtain undercut comprises a model test box, a horizontal supporting device, a steel pipe pile enclosure structure and a soil body, wherein the model test box is open, the model test box is filled with the soil body, and the soil body comprises sandy soil and saturated soft soil from bottom to top; a drain hole is arranged below the side wall of the model test box; the horizontal supporting device is connected with the model test box through bolts, is a small scale test device and is in a certain proportion with the prototype. By the device, disturbance to surrounding soil bodies, physical and mechanical properties of the building envelope and structural safety and stability of the pipe curtain underground excavation in the pipe curtain underground excavation process can be simulated, a theoretical foundation is accumulated for the pipe curtain underground excavation technology, and a solid foundation is laid for application in engineering in the future.

Description

Test device for simulating pipe curtain underground excavation

Technical Field

The utility model relates to an underground space development technical field, concretely relates to simulation pipe curtain secretly digs test device.

Background

The pipe curtain construction method is also called a calandria jacking method, and is a novel underground excavation construction technology. The construction principle of the pipe curtain construction method is that pipe jacking equipment is utilized to jack the side faces of steel pipes to be connected to form a pipe array between an originating well and a receiving well, water stopping requirements are injected into a locking opening gap to form a super-strong support, then an underground box culvert structure is constructed under the protection of a pipe curtain, and the pipe curtain can be in various shapes such as a semicircle, a circle, a door shape, a square shape and the like. The pipe curtain method is a common construction method of a large-section underground excavation tunnel, and has the advantage that a large tunnel with a complex section can be built by using miniaturized equipment.

The pipe curtain is formed into a temporary soil-retaining structure by rigid steel pipes, so that the disturbance to adjacent soil bodies during excavation is reduced, and the deformation of the surrounding soil bodies is correspondingly reduced, so that the purposes of not influencing the ground movement during excavation and maintaining the normal use functions of upper buildings and pipelines are achieved. Because the excavation of the soil body or the propulsion of the box culvert is carried out under the protection of the pipe curtain, the ground settlement can be obviously reduced, the stability of the excavation surface is greatly increased during the construction of the pipe curtain, and meanwhile, the pipe curtain has the function of isolating underground water, so that the underground water level is not required to be reduced during the construction.

However, during actual construction, the construction area is often complex, and ground and underground obstacles and abnormal geological conditions are continuously generated in the construction process, so that the construction progress and safety are seriously influenced.

Therefore, it is urgently needed to provide a safe and economic test device for simulating pipe-roof underground excavation, which accumulates a theoretical basis for the pipe-roof underground excavation technology, so as to formulate a feasible construction scheme, continuously optimize the construction process, and overcome the influences of unfavorable geological conditions such as miscellaneous fill, rocks, silt, underground water and the like and obstacles such as underground pipe networks and underground structures.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information is prior art that is known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a simulation pipe curtain secretly digs test device, through the little scale experiment of pipe curtain secretly digging, for pipe curtain secretly digs technological accumulation theoretical basis to guarantee construction progress and safety.

In order to realize the purpose, the technical scheme of the utility model is that:

a test device for simulating pipe curtain underground excavation comprises a model test box, a horizontal supporting device, a steel pipe pile enclosure structure and a soil body, wherein the model test box is open, the model test box is filled with the soil body, and the soil body comprises sandy soil and saturated soft soil from bottom to top; a drain hole is arranged below the side wall of the model test box; and the horizontal supporting device is connected with the model test box through bolts.

Compared with the prior art, the utility model discloses profitable technological effect lies in:

the utility model provides a simulation pipe curtain undercut's test device for little scale test device, is certain proportion with the prototype. By the device, disturbance to surrounding soil bodies, physical and mechanical properties of the building envelope and structural safety and stability of the pipe curtain underground excavation in the pipe curtain underground excavation process can be simulated, a theoretical foundation is accumulated for the pipe curtain underground excavation technology, and a solid foundation is laid for application in engineering in the future.

Furthermore, in order to obtain convenient materials, the organic glass plate is effectively fixed, and the outer frame of the model test box

The frame is formed by welding angle steel.

Furthermore, in order to manufacture an open visual field, facilitate observation and bear the pressure of the soil body, the bottom surface and the four side surfaces of the model test box are made of organic glass plates with the thickness of 10 mm.

Furthermore, for simulating soil body layered excavation, the organic glass plate on one side is formed by vertically splicing and inserting a plurality of unit plates. Therefore, when each layer is excavated, the soil body can be excavated from the side surface by upwards drawing out the organic glass plate corresponding to the layer.

Furthermore, a filter screen is arranged at the position of the drainage hole to prevent the soil body from leaking outside. The drain hole is used for draining and solidifying saturated soft soil, so that a filter screen is required to be arranged to prevent soil from passing through the drain hole and leaking to the outer side of the model test box, and the experimental effect is not influenced.

Furthermore, in order to obtain materials conveniently and save cost, the horizontal supporting device is made of an aluminum alloy frame. The horizontal supporting device made of the aluminum alloy frame is fixed on the side wall of the model test box through bolts.

Further, in order to balance the overall stress and achieve a better simulation effect, the steel pipe pile is made of an aluminum pipe.

Drawings

Fig. 1 is a schematic structural diagram of a test apparatus for simulating pipe curtain undercut in an embodiment of the present invention;

fig. 2 is a schematic diagram of a state of the test device for simulating pipe curtain underground excavation after simulating excavation according to an embodiment of the present invention;

fig. 3 is the utility model discloses an in the embodiment simulate the test device of pipe curtain undercut and simulate the schematic diagram of excavation back one side organic glass board.

In the figure:

10-a model test box, 11-a horizontal supporting device, 12-a steel pipe pile, 13-sandy soil, 14-saturated soft soil, 15-a bottom plate, 16-a drainage hole, 17-a filter screen and 18-an organic glass plate.

Detailed Description

The following describes the testing device for simulating pipe curtain undercut provided by the present invention in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. For convenience of description, the directions of "up" and "down" in the following description are the same as the directions of "up" and "down" in the drawings, but this should not be construed as limiting the technical solution of the present invention.

Example one

The following describes the structural components of the testing device for simulating pipe curtain undercut according to the present invention in detail with reference to fig. 1 to 3.

As shown in fig. 1 and 2, a test device for simulating pipe curtain undercut comprises a model test box 10, a horizontal support device 11, a steel pipe pile enclosure structure and a soil body. The model test box 10 is open, the model test box 10 is filled with soil, and the soil sequentially comprises sandy soil 13 and saturated soft soil 14 from bottom to top; a drain hole 16 is arranged below the side wall of the model test box 10; the horizontal supporting device 11 is bolted to the model test chamber 10. Considering that the drain hole functions to consolidate the saturated soft soil drainage, the level of the drain hole 16 coincides with the level of the sandy soil 13.

Particularly, the utility model provides a simulation pipe curtain undercut's test device for little scale test device is certain proportion with the prototype. By the device, disturbance to surrounding soil bodies, physical and mechanical properties of the building envelope and structural safety and stability of the pipe curtain underground excavation in the pipe curtain underground excavation process can be simulated, a theoretical foundation is accumulated for the pipe curtain underground excavation technology, and a solid foundation is laid for application in engineering in the future.

In this embodiment, it is more preferable that the outer frame of the model test chamber 10 is formed by welding angle steels for easy material drawing and effective fixing of the organic glass plate.

In this embodiment, it is more preferable that the bottom surface and four side surfaces of the model test chamber 10 are made of 10mm thick organic glass plates in order to create an open field of view, facilitate observation, and withstand the pressure of the soil.

In this embodiment, more preferably, in order to simulate the soil body excavation in layers, the organic glass plate on one side is formed by vertically splicing and connecting a plurality of unit plates. Therefore, when each layer is excavated, the soil body can be excavated from the side surface by upwards drawing out the organic glass plate corresponding to the layer.

In this embodiment, it is more preferable that a strainer 17 is provided at the drain hole 16 to prevent the soil from leaking. The drain hole 16 itself is used to drain and solidify the saturated soft soil, so a filter screen is needed to prevent the soil from leaking to the outside of the model test box through the drain hole, so as to avoid affecting the experimental effect.

In the present embodiment, it is more preferable that the horizontal supporting device 11 is made of an aluminum alloy frame for easy material availability and cost saving. A horizontal support 11 made of an aluminum alloy frame is fixed to the side wall of the model test chamber 10 by bolts.

In the present embodiment, it is more preferable that the steel-pipe pile 12 is made of an aluminum pipe for the purpose of balancing the entire force while achieving a good simulation effect.

Referring to fig. 3, as the soil is gradually excavated in layers, the organic glass plate 18 on the construction side is removed to become a plurality of scattered unit plates. And after the foundation pit soil body is excavated, pouring a foundation pit bottom plate 15 above the saturated soft soil 14 on the side of the foundation pit.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention in any way. Any changes and modifications of the above disclosure by those skilled in the art are within the scope of the appended claims.

Claims

1. The utility model provides a test device that simulation pipe curtain undercut, its characterized in that includes: the device comprises a model test box, a horizontal supporting device, a steel pipe pile enclosure structure and a soil body, wherein the model test box is open, the model test box is filled with the soil body, and the soil body comprises sandy soil and saturated soft soil from bottom to top; a drain hole is arranged below the side wall of the model test box; and the horizontal supporting device is connected with the model test box through bolts.

2. The test device for simulating the pipe curtain undercut of claim 1, wherein the outer frame of the model test box is formed by welding angle steel.

3. The test device for simulating the pipe curtain undercut of claim 2, wherein the bottom surface and four side surfaces of the model test box are made of 10mm thick organic glass plates.

4. The simulated pipe curtain undercut test device of claim 3, wherein the organic glass plate of one side is formed by vertically splicing and connecting a plurality of unit plates.

5. The test device for simulating pipe curtain undercut of claim 1, wherein a screen is provided at the drain hole.

6. The simulated pipe curtain undercut test device of claim 1, wherein the horizontal support means is fabricated from an aluminum alloy frame.

7. The simulated tube curtain undercut test device of claim 1, wherein the steel tube pile is made of aluminum tube.