Replacement support structure and construction method of deep foundation pit

Abstract

The present invention relates to a replacement support structure for a deep foundation pit, wherein the bottom plate of the foundation pit includes an existing section, a section to be poured, and a post-cast strip formed between the existing section and the section to be poured, and the replacement support structure includes: a support rod buried in the existing section and partially protruding toward the section to be poured, the support rod being cast by concrete; a reinforcing steel cage fixed to the end of the support rod, the reinforcing steel cage being fixedly connected to the steel cage of the section to be poured; and a reinforcement strip formed by casting, the reinforcing steel cage being buried in the reinforcement strip. The present invention effectively solves the problem that traditional steel replacement support consumes a lot of energy and does not meet the requirements of green construction. By using a concrete replacement support structure to replace traditional steel, the construction period is shortened without affecting the force transmission, and the structure is directly cast as a part of the bottom plate, thereby meeting the concept of green development.

Description

Technical Field

[0001] The invention relates to the field of building construction, in particular to a support replacement structure for a deep foundation pit. Background Art

[0002] At present, the supporting structure of deep foundation pit projects mostly adopts the form of retaining piles + internal supports. During the underground structure construction phase, the internal supports will be gradually dismantled as the project progresses, and the replacement support structure will temporarily replace the internal support to bear the force.

[0003] In the post-cast joint area, the lateral horizontal force of the foundation pit cannot be transmitted due to the discontinuity of the concrete structure. Currently, steel replacement supports are mostly used to solve the force transmission problem. However, steel replacement supports not only have a long production period and high cost, but are also consumables, which does not conform to the concept of green development. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a support replacement structure for deep foundation pits, which solves the problem that traditional steel support replacement consumes a lot of energy and does not meet the requirements of green construction. By using a concrete support replacement structure to replace traditional steel, the construction period is shortened without affecting the force transmission, and the concrete is directly cast to become a part of the base plate, thus complying with the concept of green development.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a replacement support structure for a deep foundation pit, wherein the bottom plate of the foundation pit comprises an existing section, a section to be poured, and a post-casting strip formed between the existing section and the section to be poured, and the replacement support structure comprises:

[0007] A support rod embedded in the existing section and partially protruding toward the section to be poured, the support rod being cast with concrete;

[0008] A reinforcing steel cage fixed to the end of the support rod, the reinforcing steel cage being fixedly connected to the steel cage of the section to be poured; and

[0009] The reinforcement belt is formed by pouring, and the reinforcement steel cage is buried in the reinforcement belt.

[0010] The present invention adopts a replacement support structure for deep foundation pits. Support rods are arranged between the existing section and the section to be poured, and a reinforcing steel cage is arranged to strengthen and fix the connection between the support rods and the section to be poured, so that the existing section and the section to be poured can be connected to form a force transmission structure, and then the post-cast strip is poured, so that the support rod becomes a part of the post-cast strip, which can avoid the waste of steel sections and solve the problem that traditional steel section replacement consumes a lot of energy and does not meet the requirements of green construction. By using a concrete replacement support structure to replace traditional steel sections, the construction period is shortened without affecting the force transmission, and it is directly cast as a part of the base plate, which is in line with the concept of green development.

[0011] A further improvement of the deep foundation pit replacement structure of the present invention is that it also includes a wire mesh fixed between the reinforcing steel cage and the steel cage of the section to be poured, so as to separate the reinforcing steel cage from the section to be poured to be formed.

[0012] A further improvement of the deep foundation pit replacement structure of the present invention is that it also includes a water stop strip fixed to the wire mesh.

[0013] A further improvement of the deep foundation pit replacement structure of the present invention is that a groove is formed at the end of the reinforcing steel cage corresponding to the support rod, and the end of the support rod is opened in the groove, so that the reinforcing steel cage covers the end of the support rod.

[0014] A further improvement of the deep foundation pit replacement structure of the present invention is that it also includes a water stop plate with one end fixed to the end of the support rod, and the other end of the water stop plate is fixedly connected to the reinforcing steel cage.

[0015] A further improvement of the deep foundation pit replacement structure of the present invention is that the water stop plate is arranged corresponding to the inner side wall and the bottom surface of the groove.

[0016] A further improvement of the deep foundation pit replacement structure of the present invention is that the support rod includes a support steel cage having one end fixedly connected to the existing section of the steel cage and a concrete layer formed by pouring, and the support steel cage is buried in the concrete layer.

[0017] A further improvement of the support replacement structure of the deep foundation pit of the present invention is that the grade of the concrete cast to form the reinforcement belt is higher than the grade of the concrete cast to form the section to be cast.

[0018] A further improvement of the deep foundation pit replacement structure of the present invention is that the portion of the steel cage of the section to be poured corresponding to the reinforcement belt is recessed inward to form a recessed space, and the reinforcing steel cage is fixed in the recessed space.

[0019] The present invention provides a construction method for a deep foundation pit replacement support structure, comprising the following steps:

[0020] The support rod is cast and partially buried in the existing section;

[0021] Fix the reinforcing steel cage at the end of the support rod, and fix the reinforcing steel cage to the steel cage of the section to be poured;

[0022] Concrete is poured at the position corresponding to the reinforcing steel cage to form a reinforcing belt, and concrete is poured at the position corresponding to the steel cage of the section to be poured to form the section to be poured;

[0023] Concrete is poured in the post-casting zone so that the section to be poured, the reinforcement belt, the support rod and the existing section are connected as one. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a top view of the overall structure of the support replacement structure for the deep foundation pit of the present invention.

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the AA part in the middle.

[0026] Figure 3 for Figure 1 Enlarged schematic diagram of the BB part in the middle. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] See also Figure 1 The present invention provides a deep foundation pit replacement support structure, which provides a support rod between the existing section and the section to be poured, and provides a reinforcing steel cage to strengthen and fix the connection between the support rod and the section to be poured, so that the existing section and the section to be poured can be connected to form a force transmission structure, and then the post-casting strip is poured, so that the support rod becomes a part of the post-casting strip, which can avoid the waste of steel sections, solve the problem that traditional steel section replacement support consumption is large and does not meet the requirements of green construction, and by using a concrete replacement support structure instead of traditional steel sections, the construction period is shortened without affecting the force transmission, and it is directly cast as a part of the bottom plate, which meets the concept of green development. The deep foundation pit replacement support structure of the present invention is described below in conjunction with the accompanying drawings.

[0029] See also Figure 1 , Figure 1 This is a top view of the overall structure of the deep foundation pit replacement structure of the present invention. Figure 1 , the support replacement structure of the deep foundation pit of the present invention is explained.

[0030] like Figures 1 to 3 As shown, the replacement support structure of the deep foundation pit of the present invention, the bottom plate of the foundation pit includes an existing section 21, a section to be poured 22 and a post-casting strip 23 formed between the existing section 21 and the section to be poured 22, and the replacement support structure includes:

[0031] A support rod 11 is embedded in the existing section 21 and partially protrudes toward the section to be poured 22, and the support rod 11 is cast by concrete;

[0032] A reinforcing steel cage fixed to the end of the support rod 11, the reinforcing steel cage being fixedly connected to the steel cage of the section to be cast 22; and

[0033] The reinforcement belt 12 is formed by casting, and the reinforcement steel cage is buried in the reinforcement belt 12 .

[0034] As a preferred embodiment of the present invention, it also includes a steel mesh 121 fixed between the reinforcing steel cage and the steel cage of the section to be cast 22 to separate the reinforcing steel cage from the section to be cast 22 to be formed.

[0035] Specifically, it also includes a water stop strip 1211 fixed to the steel wire mesh 121 , and the water stop strip 1211 is arranged along the length direction of the steel wire mesh 121 .

[0036] Furthermore, a groove is formed in the reinforcing steel cage corresponding to the end of the support rod 11 , and the end of the support rod 11 is opened in the groove, so that the reinforcing steel cage covers the end of the support rod 11 .

[0037] Specifically, it also includes a water stop plate 113 with one end fixed to the end of the support rod 11, and the other end of the water stop plate 113 is fixedly connected to the reinforcing steel cage.

[0038] Preferably, the water stop plate 113 is arranged corresponding to the inner side wall and the bottom surface of the groove.

[0039] Furthermore, the support rod 11 includes a support steel cage 111 , one end of which is fixedly connected to the steel cage of the existing section 21 , and a concrete layer 112 formed by pouring, and the support steel cage 111 is buried in the concrete layer 112 .

[0040] Furthermore, the grade of the concrete used to form the reinforcing belt 12 is higher than the grade of the concrete used to form the to-be-cast section 22 .

[0041] Furthermore, the portion of the steel cage of the section to be cast 22 corresponding to the reinforcing belt 12 is recessed inward to form a recessed space, and the reinforcing steel cage is fixed in the recessed space.

[0042] The specific implementation of the present invention is as follows:

[0043] Before pouring the existing section 21, a support steel cage is fixed at a position of the existing section 21 close to the section to be poured 22, and the support steel cage 111 is fixedly connected to the steel cage of the existing section 21. A plurality of horizontally arranged water stop plates 113 are welded to the side and end of the support steel cage 111, and then concrete is poured to form the support rod 11 and the existing section 21. At this time, the support steel cage 111 is buried in the concrete layer 112, and the water stop plate 113 is partially buried in the support rod 11;

[0044] Tie up the steel cage of the section to be poured 22, the steel cage of the section to be poured 22 forms a recessed space near the support rod 11, fix the wire mesh 121 along the inner wall of the recessed space, tie up the reinforcing steel cage in the recessed space, the wire mesh 121 separates the reinforcing steel cage from the steel cage of the section to be poured 22, the reinforcing steel cage forms a groove corresponding to the support rod 11, the support rod 11 is clamped in the groove, and the water stop strip 1211 is fixed to the wire mesh 121;

[0045] The pouring forms the section to be poured 22 and the reinforcement belt 12, part of the water stop plate 113 is buried in the reinforcement belt 12, and then the post-casting belt 23 is poured, and the remaining water stop plate 113 is buried in the post-casting belt 23. At this time, the section to be poured 22, the reinforcement belt 12, the post-casting belt 23, the support rod 11 and the existing section 21 are connected as a whole to form a force transmission structure to support the deep foundation pit.

[0046] The present invention also provides a construction method for a deep foundation pit replacement support structure, the method comprising the following steps:

[0047] Casting to form the support rod 11, and the support rod 11 is partially buried in the existing section 21;

[0048] A reinforcing steel cage is fixed to the end of the support rod 11, and the reinforcing steel cage is fixedly connected to the steel cage of the section to be cast 22;

[0049] Concrete is poured at the position corresponding to the reinforcing steel cage to form the reinforcing belt 12, and concrete is poured at the position corresponding to the steel cage of the section to be poured 22 to form the section to be poured 22;

[0050] Concrete is poured in the post-casting strip 23 so that the section to be poured 22, the reinforcing strip 12, the support rod 11 and the existing section 21 are connected as one body.

[0051] The specific operation mode of the construction method provided by the present invention is actually implemented as follows:

[0052] Before pouring the existing section 21, a support steel cage is fixed at a position of the existing section 21 close to the section to be poured 22, and the support steel cage 111 is fixedly connected to the steel cage of the existing section 21. A plurality of horizontally arranged water stop plates 113 are welded to the side and end of the support steel cage 111, and then concrete is poured to form the support rod 11 and the existing section 21. At this time, the support steel cage 111 is buried in the concrete layer 112, and the water stop plate 113 is partially buried in the support rod 11;

[0053] Tie up the steel cage of the section to be poured 22, the steel cage of the section to be poured 22 forms a recessed space near the support rod 11, fix the wire mesh 121 along the inner wall of the recessed space, tie up the reinforcing steel cage in the recessed space, the wire mesh 121 separates the reinforcing steel cage from the steel cage of the section to be poured 22, the reinforcing steel cage forms a groove corresponding to the support rod 11, the support rod 11 is clamped in the groove, and the water stop strip 1211 is fixed to the wire mesh 121;

[0054] The pouring forms the section to be poured 22 and the reinforcement belt 12, part of the water stop plate 113 is buried in the reinforcement belt 12, and then the post-casting belt 23 is poured, and the remaining water stop plate 113 is buried in the post-casting belt 23. At this time, the section to be poured 22, the reinforcement belt 12, the post-casting belt 23, the support rod 11 and the existing section 21 are connected as a whole to form a force transmission structure to support the deep foundation pit.

[0055] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A deep foundation pit replacement support structure, the bottom plate of the foundation pit includes an existing section, a section to be poured, and a post-casting strip formed between the existing section and the section to be poured, characterized in that: The support structure includes: A support rod embedded in the existing section and partially protruding toward the section to be poured, wherein the support rod is cast by concrete; A reinforcing steel cage fixed to the end of the support rod, the reinforcing steel cage being fixedly connected to the steel cage of the section to be cast; and A reinforcement belt formed by casting, wherein the reinforcement steel cage is buried in the reinforcement belt; The reinforcing steel cage is formed with a groove corresponding to the end of the support rod, and the end of the support rod is clamped in the groove, so that the reinforcing steel cage covers the end of the support rod; The portion of the steel cage of the section to be poured corresponding to the reinforcement belt is recessed inward to form a recessed space, and the reinforcing steel cage is fixed in the recessed space.

2. The deep foundation pit replacement structure according to claim 1, characterized in that: It also includes a steel wire mesh fixed between the reinforcing steel cage and the steel cage of the section to be cast, so as to separate the reinforcing steel cage from the section to be cast.

3. The deep foundation pit replacement structure according to claim 2, characterized in that: It also includes a water stop strip fixed to the steel wire mesh.

4. The deep foundation pit replacement structure according to claim 1, characterized in that: It also includes a water stop plate with one end fixed to the end of the support rod, and the other end of the water stop plate is fixedly connected to the reinforcing steel cage.

5. The deep foundation pit replacement structure according to claim 4, characterized in that: The water stop plate is arranged corresponding to the inner side wall and the bottom surface of the groove.

6. The deep foundation pit replacement structure according to claim 1, characterized in that: The support rod comprises a support steel cage having one end fixedly connected to the existing steel cage and a concrete layer formed by pouring, and the support steel cage is buried in the concrete layer.

7. The deep foundation pit replacement structure according to claim 1, characterized in that: The grade of the concrete used to cast the reinforcing strip is higher than the grade of the concrete used to cast the section to be cast.

8. A construction method for a deep foundation pit replacement support structure as claimed in claim 1, characterized in that: The steps include: Casting to form the support rod, wherein a portion of the support rod is buried in the existing section; Fixing a reinforcing steel cage at the end of the support rod, and fixing the reinforcing steel cage to the steel cage of the section to be cast; Pouring concrete at a position corresponding to the reinforcing steel cage to form the reinforcing belt, and pouring concrete at a position corresponding to the steel cage of the section to be poured to form the section to be poured; Concrete is poured in the post-casting zone so that the section to be poured, the reinforcement belt, the support rod and the existing section are connected as one body.

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