Double-enclosing-purlin combined structure capable of automatically adjusting concrete supporting axial force

Abstract

The utility model relates to the technical field of building foundation pit supporting, in particular to a double-enclosing-purlin combined structure capable of automatically adjusting concrete supporting axial force, a certain distance is reserved between an outer-side enclosing purlin and an inner-side enclosing purlin, and a plurality of jack forcing devices are evenly arranged between the outer-side enclosing purlin and the inner-side enclosing purlin at intervals along an extending direction machine of the enclosing purlins. The two sides of the jack forcing devices make contact with the outer side surrounding purlin and the inner side surrounding purlin respectively, and concrete blocks are arranged in gaps among the jack forcing devices. The utility model has the advantages that: the application range of the foundation pit is further expanded, the construction process of a support enclosing purlin system is simplified, the maintenance time is shortened, the waste concrete engineering quantity is reduced, the energy-saving coefficient is improved, and the engineering cost is correspondingly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building foundation pit support, in particular to a double surrounding purlin combined structure capable of automatically adjusting the concrete supporting axial force. Background Art

[0002] Conventional concrete supports are affected by comprehensive factors such as lateral water and soil pressure of the retaining structure, concrete creep, and temperature shrinkage, making it difficult to meet the micro-deformation control requirements of the foundation pit and its surrounding environment. Subsequently, a support system that actively controls deformation was developed. This support system combines the advantages of concrete support and active servo control of steel support. By adding hydraulic jacks to the concrete purlins, after the jack axial force is loaded, the purlins will be detached from the retaining structure due to the compression and shrinkage of the concrete, thus transforming into an axial force compensation system controlled by hydraulic jacks.

[0003] "An Automatic Deformation Control Support Structure and Implementation Method" (CN113404059 A) discloses an automatic deformation control support structure, in which the supporting purlin is made into a groove shape, the groove is close to the retaining wall, a hydraulic jack is placed in the groove, and the two ends are respectively against the foundation pit retaining wall and the grooved concrete purlin. Two servo jacks are set on each ground wall, and the jacking force of the jack is used to compensate for the supporting axial force. The disadvantage of this system is that the retaining structure is limited to underground continuous walls, and the scope of application is limited.

[0004] "An integrally stressed support system with active displacement control" (CN215669556 U) is achieved by setting up inner and outer double-layer concrete purlins, connecting the enclosure structure with the outer concrete purlins, placing hydraulic jacks between the double-layer purlins, and setting reinforced concrete blocks in the remaining gaps to connect the outer purlins with the inner support system purlins. This solution can expand the scope of application of foundation pits, but the process is complicated, the construction convenience is poor, and the double purlins are costly and economical. Summary of the invention

[0005] The purpose of the utility model is to provide a double purlin combination structure capable of automatically adjusting the axial force of concrete support in accordance with the above-mentioned deficiencies of the prior art. The double purlin combination structure is adopted to ensure that the lateral water and soil pressure borne by the retaining structure can be transmitted to the support in a balanced and stable manner. The outer purlin is connected to the retaining structure, and its function is to ensure that the lateral pressure of a single pile is converted into a uniformly distributed confining pressure. Considering that the force is single and clear, the outer purlin and the inner purlin of the inner concrete support system, the hydraulic jack device, etc. together constitute a double purlin combination structure capable of automatically adjusting the axial force of concrete support, which solves the problems of small application range, low construction efficiency, and poor economy.

[0006] The purpose of this utility model is achieved by the following technical solutions:

[0007] A double purlin combination structure capable of automatically adjusting the axial force of concrete support comprises a foundation pit retaining structure, wherein an outer purlin and an inner purlin are sequentially arranged on the inner side of the foundation pit retaining structure in the direction from the outside of the pit to the inside of the pit, and the characteristic is that a certain distance is reserved between the outer purlin and the inner purlin, and a plurality of jack boosting devices are evenly arranged between the two along the extension direction of the purlin, and both sides of the plurality of jack boosting devices are respectively in contact with the outer purlin and the inner purlin, and concrete blocks are arranged in the gaps between the plurality of jack boosting devices.

[0008] The inner purlin serves as a part of the internal support system of the foundation pit. The concrete block is synchronously tied and cast with the internal support system to form an integral structure, one end of which is rigidly connected to the inner purlin and the other end is pressed against the outer purlin.

[0009] The outer purlin is connected to the foundation pit retaining structure through a steel bracket.

[0010] The outer purlin is a steel purlin, and the inner purlin is a concrete purlin.

[0011] The utility model has the advantages of further expanding the scope of application of foundation pits, simplifying the construction process of supporting purlin systems, shortening the maintenance time, reducing the amount of waste concrete engineering, improving the energy-saving coefficient, and reducing the engineering cost accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0013] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0014] like Figure 1 As shown, the marks 1-5, namely A and B in the figure respectively represent: retaining structure 1, outer steel purlin 2, reinforced concrete block 3, jack booster device 4, inner concrete purlin 5, A inside the pit, and B outside the pit.

[0015] Example: Figure 1 As shown, the double purlin composite structure capable of automatically adjusting the concrete supporting axial force in this embodiment is composed of an outer steel purlin 2, an inner concrete purlin 5, a jack force adding device 4 and a reinforced concrete block 3. From the pit outside B to the pit inside A, the enclosure structure 1, the outer steel purlin 2 and the inner concrete purlin 5 are arranged in sequence.

[0016] Among them, the inner concrete purlin 5 is cast synchronously with the support as part of the horizontal concrete support system. The outer steel purlin 2 is connected to the enclosure structure 1 through a steel bracket to ensure that the lateral pressure of the single pile is converted into a uniformly distributed confining pressure. A certain distance is reserved between the outer steel purlin 2 and the inner concrete purlin 5, and a jack booster 4 is set. The gaps between the jack boosters 4 are filled with rigid concrete blocks 3. The reinforced concrete blocks 3 are tied and cast synchronously with the internal support system. As a connecting device, one end of the reinforced concrete block 3 is rigidly connected to the inner concrete purlin 5, and the other end is pushed to the outer steel purlin 2.

[0017] By arranging the above-mentioned combined structure between the retaining structure 1 and the internal support system, when the jack booster 4 is started, the horizontal thrust toward the outside of the pit B will be evenly applied to the retaining structure 1 through the outer steel purlin 2. As the jack booster 4 increases, the reinforced concrete block 3 gradually separates from the outer steel purlin 2. The separation distance and the horizontal deformation of the retaining structure 1 are monitored in real time by the deformation monitor. After the deformation data is fed back to the pressure controller, the jack booster 4 can be adjusted in real time to achieve the purpose of automatically adjusting the concrete support axial force.

[0018] In this embodiment, the double purlin combination structure that can automatically adjust the axial force of the concrete support can adapt to various types of retaining structures and ensure that the lateral water and soil pressure borne by the retaining structure is transmitted to the support in a balanced and stable manner.

[0019] In this embodiment, the double purlin combination structure can automatically adjust the concrete support axial force. The outer steel purlin 2 is made of steel material, which simplifies the purlin system construction process, shortens the maintenance time, and reduces the amount of waste concrete. This part can be recycled and reused, effectively implementing the green energy-saving purpose and reducing construction energy consumption.

[0020] The double purlin composite structure can automatically adjust the concrete support axial force. The steel size of the outer steel purlin 2 can be determined according to the calculated value of the confining pressure, and the foundation pit has a wide range of applications.

[0021] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A double purlin combined structure capable of automatically adjusting the concrete support axial force, comprising a foundation pit retaining structure, wherein an outer purlin and an inner purlin are sequentially arranged on the inner side of the foundation pit retaining structure in a direction from the outside of the pit to the inside of the pit, and characterized in that: A certain distance is reserved between the outer purlin and the inner purlin, and a plurality of jack force devices are evenly arranged between the two along the extension direction of the purlin. Both sides of the plurality of jack force devices are in contact with the outer purlin and the inner purlin respectively, and concrete blocks are arranged in the gaps between the plurality of jack force devices.

2. The double-purlin combined structure capable of automatically adjusting the concrete support axial force according to claim 1 is characterized in that: The inner purlin serves as a part of the internal support system of the foundation pit. The concrete block is synchronously tied and cast with the internal support system to form an integral structure, one end of which is rigidly connected to the inner purlin and the other end is pressed against the outer purlin.

3. The double-purlin combined structure capable of automatically adjusting the concrete support axial force according to claim 1 is characterized in that: The outer purlin is connected to the foundation pit retaining structure through a steel bracket.

4. The double-purlin combined structure capable of automatically adjusting the concrete support axial force according to claim 1 is characterized in that: The outer purlin is a steel purlin, and the inner purlin is a concrete purlin.

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