Fabricated foundation pit supporting structure test model device

Abstract

The present application relates to a kind of prefabricated foundation pit supporting structure test model device.It is applicable to the physical model test of foundation pit excavation support and supporting structure failure.The technical scheme of the present application is: the device has several vertical fixed in the edge of foundation pit bottom and arranged into row straight piles, the waist and top of straight pile are detachably installed with waist beam and crown beam by fixed buckle, several inclined piles are installed on the waist by force transmission buckle, the bottom end of inclined pile is supported on the bottom of foundation pit, and the top end of inclined pile is supported on the force transmission buckle on waist beam;The force transmission buckle has inverted U type buckle and limiting angle plate, wherein the inverted U type buckle is buckled on the waist beam, and there is a gap between the corresponding inner side wall of inverted U type buckle and the side of waist beam towards foundation pit;The cross section of limiting angle plate is V-shaped, one side plate of limiting angle plate is inserted into the gap between inverted U type buckle and waist beam and is fixed on waist beam by screw II passing through the side wall of inverted U type buckle and the side plate, and the other side plate of limiting angle plate supports the top end of corresponding inclined pile.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of prefabricated foundation pit supporting structure test model device. It is applicable to the physical model test of foundation pit excavation support and supporting structure failure. BACKGROUND

[0002] The case of supporting structure failure in the process of foundation pit construction is everywhere, especially in the environment of dense urban buildings, the deformation and collapse accident caused by the failure of foundation pit supporting structure influences and destroys surrounding buildings, underground pipelines, and seriously threatens the life and health and property safety of construction personnel and surrounding residents. Therefore, it is very important to study the failure mechanism of supporting structure in the process of foundation pit excavation and its influence on surrounding existing buildings.

[0003] The research methods of supporting structure failure mechanism and the influence of deformation and collapse accident on surrounding buildings include experience analysis method, theoretical analysis method, indoor physical model test method, field test method and numerical analysis method. Among them, the indoor physical model test can accurately simulate the stress and deformation characteristics of supporting structure failure in the process of foundation pit construction, so it is widely used in the research of foundation pit excavation support technology.

[0004] In recent years, many scholars have developed various indoor physical model test devices for different foundation pit supporting structures. Among them, the Chinese patent document with authorized publication number CN209741859U discloses a herringbone foundation pit supporting structure. This structure is simple, compact, strong in integrity, high in reliability, good in self-stability, occupies very small space, provides sufficient space for work in foundation pit, and reduces construction cost. However, the above prior art cannot realize the removal of crown beam, waist beam and internal inclined pile structure in the process of foundation pit excavation, and cannot simulate the action mechanism of herringbone supporting structure. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a prefabricated foundation pit supporting structure test model device to realize the removal of crown beam, waist beam and internal inclined pile structure in the process of foundation pit excavation, simulate the stress and deformation law of supporting under the condition of inclined pile failure, and provide basis for studying the failure mechanism of supporting structure in the process of foundation pit excavation.

[0006] The technical solution adopted by the present application is: a prefabricated foundation pit supporting structure test model device, characterized in that: a plurality of straight piles are vertically fixed to the edge of the foundation pit bottom and arranged in rows, the waist and top of the straight piles are detachably installed with waist beams and crown beams through fixed buckles, a plurality of inclined piles are installed on the waist through force transmission buckles, the bottom end of the inclined piles is supported on the bottom of the foundation pit, and the top end of the inclined piles is supported on the force transmission buckle on the waist beam.

[0007] The force transmission buckle has an inverted U-shaped buckle and a limiting angle plate, wherein the inverted U-shaped buckle is buckled on the waist beam, and a gap is left between the side of the waist beam facing the foundation pit and the corresponding inner side wall of the inverted U-shaped buckle; the limiting angle plate has a V-shaped cross section, one side plate of the limiting angle plate is inserted into the gap between the inverted U-shaped buckle and the waist beam and is fixed on the waist beam through a screw II passing through the side wall of the inverted U-shaped buckle and the side plate, and the other side plate of the limiting angle plate supports the top end of the corresponding inclined pile.

[0008] The fixing buckle has a U-shaped groove matched with the corresponding waist beam or crown beam, the waist beam and the crown beam can be placed in the corresponding U-shaped groove, a locking hoop matched with the straight pile is fixed on the outer side wall of the U-shaped groove, and a fixed cover plate is fixed on the top of the U-shaped groove through a screw I.

[0009] The locking hoop is a circular ring structure processed from a stainless steel sheet and has an open shape, round holes are reserved on both sides of the opening of the locking hoop, and the locking hoop is adjusted through a bolt in the round hole to be fixedly connected with the straight pile.

[0010] The straight pile is a hollow circular pipe made of plastic or metal material, and the pile spacing between the straight piles is 2-2.5 times the pile diameter.

[0011] The crown beam and the waist beam are both hollow square pipes made of plastic or metal material.

[0012] The inclined pile is made of plastic or metal material and is a solid cylindrical or square column or a hollow circular or square pipe.

[0013] The limiting angle plate has multiple models, each model of the limiting angle plate has multiple different included angles, and the limiting angle plate of a corresponding model is selected according to the required inclination angle of the inclined pile.

[0014] The crown beam and the waist beam are installed on the top and waist positions of the straight pile respectively through the fixing buckle, the straight pile forms a structural whole, and the soil pressure on the outside of the foundation pit is borne together.

[0015] The fixing buckle in the application includes a U-shaped groove, a locking hoop and a fixed cover plate, the locking hoop is fixedly connected with the straight pile, the U-shaped groove supports the crown beam and the waist beam, and the fixed cover plate locks the crown beam and the waist beam in the U-shaped groove,

[0016] The crown beam and the waist beam are quickly installed and fixed, and the crown beam and the waist beam are quickly removed during the excavation of the foundation pit, and the position of the waist beam is conveniently adjusted.

[0017] In the application, the supporting force of the inclined pile is transmitted to the waist beam through the force transmission buckle, so as to play a lateral supporting role on the straight pile.

[0018] The force transmission buckle comprises an inverted U-shaped buckle and a limiting angle plate. The limiting angle plate is inserted into the gap between the inverted U-shaped buckle and the waist beam through one side plate and is fixed on the waist beam through a screw passing through the side wall of the inverted U-shaped buckle and the side plate. By replacing the limiting angle plate with different included angles, the inclination angle of the batter pile can be conveniently adjusted. The installation and removal of the batter pile with different inclination angles during the excavation of the foundation pit are realized through the force transmission buckle, so that the physical model test of the foundation pit under the failure condition of the batter pile is completed.

[0019] The present application can select support structure models with different materials and different structural geometric parameters according to requirements, and form a herringbone support structure test device with different batter pile inclination angles and support positions. The crown beam and the waist beam of the device are detachably connected with the vertical pile, the waist beam and the batter pile, and the structure is simple, easy to install and disassemble, and the physical model experiment of the foundation pit excavation support and the support structure under the failure condition is completed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure schematic diagram of the embodiment.

[0021] Figure 2 The explosion schematic diagram of the embodiment.

[0022] Figure 3 The Figure 1 The enlarged view of A in the middle;

[0023] Figure 4 The Figure 1 The enlarged view of B in the middle;

[0024] Figure 5 The Figure 2 The enlarged view of C in the middle;

[0025] Figure 6 The Figure 2 The enlarged view of D in the middle;

[0026] 10, vertical pile; 20, crown beam; 30, waist beam; 40, batter pile; 50, fixed buckle; 51, U-shaped groove; 511, screw hole I; 52, locking hoop; 521, round hole; 522, fixed bolt; 53, fixed cover plate; 531, screw hole II; 532, screw I; 60, force transmission buckle; 61, inverted U-shaped buckle; 611, screw hole III; 62, limiting angle plate; 621, screw hole IV; 63, screw II. DETAILED DESCRIPTION

[0027] The embodiment is a fabricated foundation pit support structure test model device, which has a plurality of vertical piles fixed on the edge of the bottom of the foundation pit and arranged in a row. The waist of the vertical pile is detachably installed with a waist beam through a fixed buckle. The top of the vertical pile is detachably installed with a crown beam through a fixed buckle. A plurality of force transmission buckles are detachably installed on the waist beam. Corresponding to the force transmission buckles, a batter pile is provided. The bottom end of the batter pile is supported on the bottom of the foundation pit, and the top end of the batter pile is supported on the force transmission buckle on the waist beam.

[0028] The straight piles in the example are hollow circular tubes made of plastic or metal material, and the pile spacing between adjacent straight piles is 2-2.5 times the diameter of the pile.

[0029] The crown beams and the waist beams in the example are hollow square tubes made of plastic or metal material, the cross-sectional height h of the hollow square tube is equal to the diameter of the straight pile, and the cross-sectional width b of the hollow square tube is equal to 0.5-1 times the cross-sectional height.

[0030] The fixing buckle in the example is made of stainless steel material, including a U-shaped groove, a locking hoop and a fixed cover plate. The opening side of the U-shaped groove faces upward, and the inner net width of the U-shaped groove is equal to the width b of the crown beam and the waist beam plus 0.5 mm. The inner net height of the U-shaped groove is equal to the height h of the crown beam and the waist beam plus 0.5 mm. Two pairs of screw holes I are reserved on the top surface of the side wall of the U-shaped groove. The locking hoop is made of a stainless steel sheet and has a circular ring structure. The locking hoop is open and has a circular hole reserved on both sides. The locking hoop is adjusted by a bolt passing through the two circular holes, so that it can be fixedly connected with the straight pile. The center line of the closed side of the locking hoop is fixedly connected to the outer side of the U-shaped groove. The size of the fixed cover plate is matched with the size of the opening side of the U-shaped groove. Screw holes II are reserved on the fixed cover plate, and the position and diameter of the screw holes II correspond to the screw holes I on the U-shaped groove.

[0031] In the example, the fixing buckle is fixed on the top or waist of the straight pile by the locking hoop. The crown beam and the waist beam are placed in the U-shaped groove of the corresponding fixing buckle on the straight pile, and the fixed cover plate is covered. The fixed cover plate is fixed to the top of the U-shaped groove by screw I cooperating with screw holes I and II, so as to connect the crown beam and the waist beam with the fixing buckle as a whole. The crown beam and the waist beam can be installed and removed at any time by operating the screw I, forming an assembled crown beam and waist beam structure.

[0032] The force transmission buckle in the example includes an inverted U-shaped buckle and a limiting angle plate, both of which are made of stainless steel material. The opening of the inverted U-shaped buckle faces downward, and two screw holes III are reserved on one side wall. The inner net width of the inverted U-shaped buckle is equal to the width b of the waist beam plus 3.5 mm. The inverted U-shaped buckle is installed on the waist beam in the area between the adjacent straight piles, and the side wall with screw holes III is close to the inner side of the foundation pit. There is a gap between the side wall with screw holes III of the inverted U-shaped buckle and the inner side of the waist beam facing the foundation pit.

[0033] The limiting angle plate in the example is made of stainless steel with a thickness of 2-3 mm and is bent to form a V-shaped structure. One side plate of the V-shaped structure is an insertion plate, and the other side plate is a supporting plate. Screw holes IV corresponding to the screw holes III on the inverted U-shaped buckle are reserved on the insertion plate. The insertion plate of the limiting angle plate is inserted into the gap between the inner side of the inverted U-shaped buckle and the waist beam, and is fixed to the waist beam by the screw II inserted into the screw holes III and IV. At this time, the supporting plate of the limiting angle plate is inclined upward.

[0034] The inclined pile in the example is made of plastic or metal material, and can be a solid cylinder or square column, a hollow circular tube or square tube. The bottom end of the inclined pile is supported on the bottom of the foundation pit, the top end of the inclined pile is supported on the support plate of the corresponding force transmission buckle, and the inclined pile is basically perpendicular to the support plate.

[0035] In the embodiment, the limiting angle plate has multiple types, and the included angle between the insertion plate and the support plate of each type of limiting angle plate has multiple different angles. The limiting angle plate of a corresponding type is selected according to the required inclination angle of the inclined pile, and the included angle between the insertion plate and the support plate of the limiting angle plate is consistent with the angle of the inclination angle of the inclined pile.

[0036] In the embodiment, the crown beam and the waist beam are installed on the top and waist positions of the straight pile respectively through the fixing buckles, so that the straight pile forms a structural whole, and jointly bears the earth pressure on the outside of the foundation pit. The fixed cover plate is installed on the fixing buckle to realize the quick installation and fixation of the crown beam and the waist beam, and to realize the quick removal of the crown beam and the waist beam during the excavation of the foundation pit. The force transmission buckle is used to realize the installation and removal of the inclined pile with different inclination angles during the excavation of the foundation pit, so as to realize the foundation pit model test under the condition of failure of the inclined pile.

[0037] The specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application, and are protected by the patent law.

Claims

1. A prefabricated foundation pit support structure test model device, characterized in that: It has several vertically fixed to the bottom edge of the foundation pit and arranged in rows. The waist and top of the vertical piles are detachably installed with waist beams and crown beams via fixing buckles. Several inclined piles are installed on the waist beams via force transmission buckles. The bottom of the inclined piles is supported at the bottom of the foundation pit, and the top of the inclined piles is supported on the force transmission buckles on the waist beams. The force transmission buckle has an inverted U-shaped buckle and a limiting angle plate. The inverted U-shaped buckle is fastened to the waist beam, and a gap is left between the side of the waist beam facing the pit and the corresponding inner wall of the inverted U-shaped buckle. The limiting angle plate has a V-shaped cross-section. One side plate of the limiting angle plate is inserted into the gap between the inverted U-shaped buckle and the waist beam and is fixed to the waist beam by screws II that pass through the side wall of the inverted U-shaped buckle and the side plate. The other side plate of the limiting angle plate supports the top of the corresponding inclined pile. Straight piles are hollow round tubes made of plastic or metal materials, and the spacing between straight piles is 2 to 2.5 times the pile diameter; Both the crown beam and the waist beam are made of hollow square tubes made of plastic or metal.

2. The prefabricated foundation pit support structure test model device according to claim 1, characterized in that: The fixing buckle has a U-shaped groove that is adapted to the corresponding waist beam or crown beam. The waist beam or crown beam can be placed in the corresponding U-shaped groove. A locking hoop adapted to the straight pile is fixed on the outer wall of the U-shaped groove. A fixing cover plate is fixed to the top of the U-shaped groove by screw I.

3. The prefabricated foundation pit support structure test model device according to claim 2, characterized in that: The locking hoop is a ring-shaped structure made of stainless steel sheet with an open shape. Circular holes are reserved on both sides of the opening of the locking hoop. The locking hoop is adjusted by bolts in the circular holes to fix it to the straight pile.

4. The prefabricated foundation pit support structure test model device according to claim 1, characterized in that: The inclined piles are made of plastic or metal materials and can be solid cylindrical or square columns, or hollow cylindrical or square tubes.

5. The prefabricated foundation pit support structure test model device according to claim 1, characterized in that: The limiting angle plate comes in various models, and each model has a variety of different included angles. The appropriate model of limiting angle plate is selected according to the required inclination angle of the inclined pile in the test.

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