Deep foundation pit supporting structure and construction method

Abstract

The deep foundation pit supporting structure comprises a pile plate body, a pouring gate is reserved in the bottom end of the pile plate body, the bottom edge of the pile plate body inclines upwards towards the pouring gate from outside to inside to form a concrete converging section, and the top edge of the pile plate body is consistent with the bottom line shape of the concrete converging section; the current construction method can be optimized, the secondary repairing and filling frequency is reduced, and the construction efficiency is improved.

Description

Technical Field

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

[0002] At present, in the construction process of the construction industry, more and more buildings are being built underground. In order to maximize the use of land resources within the red line without affecting the existing buildings around, some forms of foundation pit support have to be adopted to meet the above requirements. In the pile-board support structure, the baffle between piles has to be constructed by reverse construction. For this component, the existing construction method leads to common quality problems at the construction joints of the new and old pourings, and the concrete cannot be poured densely. Almost all of them need secondary repairs and fillings. Not only is the construction period long, but the construction quality is relatively poor.

[0003] Therefore, in order to solve the above problems, a deep foundation pit support structure and construction method are needed, which can optimize the current construction method, reduce the frequency of secondary repair and filling, and improve construction efficiency. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a deep foundation pit support structure and construction method, which can optimize the current construction method, reduce the frequency of secondary repair and filling, and improve construction efficiency.

[0005] The deep foundation pit support structure of the present invention includes a pile plate body, a pouring port is reserved at the bottom end of the pile plate body, the bottom edge of the pile plate body is inclined from the outside to the inside and upward toward the pouring port to form a concrete collection section, and the top edge of the pile plate body is consistent with the bottom line of the concrete collection section.

[0006] Furthermore, a notch is provided at the top edge of the pile plate body corresponding to the pouring port position, and a movable plate is arranged in the notch, and the movable plate is driven to block the notch or expose the notch.

[0007] Furthermore, it also includes a plurality of support piles, wherein the plurality of support piles are arranged at intervals in the transverse direction;

[0008] The pile plate body is composed of a plurality of pieces, and each piece of the pile plate body is limited by two support piles adjacent to each other in the transverse direction, so as to form a layer of retaining wall in the transverse direction.

[0009] Furthermore, several pieces of the pile plate bodies are also connected in the longitudinal direction so that a longitudinally continuous retaining wall is formed between two adjacent supporting piles.

[0010] Furthermore, the support piles are fixed to the side walls of the foundation pit by anchor cables, and the anchor cables are inclined downward from the outside to the inside.

[0011] Furthermore, the anchor cables provided on each supporting pile are several in number and arranged in the longitudinal direction.

[0012] Furthermore, it also includes a formwork support rod assembly, wherein the formwork support rod assembly includes a bottom formwork support rod and a top formwork support rod;

[0013] The front end of the bottom formwork rod is detachably hinged to the bottom of the pile board body, and the front end of the top formwork rod is detachably hinged to the top of the pile board body;

[0014] The rear end of the bottom formwork rod and the rear end of the top formwork rod are hingedly arranged.

[0015] Furthermore, the formwork support rod assembly also includes a positioning lock, which is used to determine the hinge angle of the bottom formwork rod and the top formwork rod.

[0016] Furthermore, it also includes a mold bottom blocking block, and a pouring cavity is formed between the pile plate body and the side wall of the foundation pit. The mold bottom blocking block is controlled to close the bottom of the pouring cavity.

[0017] This solution also discloses a deep foundation pit construction method based on the deep foundation pit support structure, comprising the following construction steps:

[0018] S1. Fix the support piles at the designated position of the foundation pit through anchor cables;

[0019] S2. Arrange the pile sheet body and set a bottom mold block between the pile sheet body and the side wall of the foundation pit;

[0020] S3. Adjust the formwork support rod assembly so that the pile plate body is limited at the specified position;

[0021] S4. Pour concrete into the pouring cavity and close the movable plate when the concrete overflows from the notch;

[0022] S5. Repeat steps S2-S4 from top to bottom to complete the construction;

[0023] No mold bottom blocking block is provided at the bottom of the last pile board body.

[0024] The beneficial effects of the present invention are as follows: a deep foundation pit support structure and a construction method disclosed in the present invention can effectively avoid the situation where the construction joints are not poured densely or fully, thereby ensuring the construction quality and visual quality of the concrete, satisfying the workers' one-time pouring requirements, improving the construction efficiency of the operators, reducing quality risks, and achieving the intended purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2For the present invention Figure 1 AA structural diagram;

[0028] Figure 3 It is a structural schematic diagram of the pile plate body of the present invention;

[0029] Figure 4 For the present invention Figure 3 Schematic diagram of the BB structure. DETAILED DESCRIPTION

[0030] Figure 1 It is a structural schematic diagram of the present invention. As shown in the figure, the deep foundation pit support structure in this embodiment includes a pile plate body 1, a pouring port 11 is reserved at the bottom end of the pile plate body 1, and the bottom edge of the pile plate body 1 is inclined from the outside to the inside and upward toward the pouring port 11, so that a concrete collecting section is formed at the bottom of the pile plate body.

[0031] As shown in the figure, the pile plate body 1 of the present scheme is a rectangular plate, the middle of the bottom edge of the pile plate body 1 is rectangularly concave upward, and the two ends of the bottom edge of the pile plate body 1 located on both sides of the rectangular concave are connected obliquely upward from the outside to the inside to the bottom of the concave profile, so that the bottom edge of the pile plate body 1 forms a cone with a flared mouth facing downward, and the bottom profile of the concrete collection section is similar to a funnel shape. When it is actually used, concrete is poured there, and when the concrete is filled from bottom to top, the measuring groove formed by the concrete collection section is filled up automatically, which can effectively avoid the situation of loose and incomplete pouring at the construction joint, ensure the construction quality and visual quality of the concrete, meet the workers' one-time pouring in place, improve the construction efficiency of the operating workers, reduce quality risks, and achieve the expected purpose;

[0032] And in this scheme, because the reverse construction method is required, multiple pile board bodies 1 need to be stacked in the vertical direction. Therefore, the top edge of the pile board body 1 in this scheme is consistent with the bottom line of the concrete converging section; so that the two pile board bodies 1 spliced ​​in the height direction can be completely matched, improving the pouring quality; further, the top edge of the pile board body 1 has a notch corresponding to the pouring port 11, and a movable plate 12 is arranged in the notch, and the movable plate 12 is driven to block the notch or expose the notch; the notch and the movable plate 12 arranged corresponding to it , and the top edge profile is consistent with the bottom line of the concrete converging section, which can make the next-level pile board body 1 completely fit with the previous-level pile board body 1, and only a notch that can be controlled to open and close is formed at the pouring port 11 for pouring concrete, which can make the pouring quality better and the pouring difficulty lower; the movable plate 12 of this scheme is set at the notch in a pull-out manner, and a handle and a latch for locking are set on its outside. When concrete overflows from the notch, it means that the groove formed by the concrete converging section is filled with concrete, and the notch is sealed by the movable plate 12 and locked by the latch.

[0033] In this embodiment, a plurality of support piles 2 are further included, and the plurality of support piles 2 are arranged at intervals in the transverse direction;

[0034] The pile plate body 1 is composed of several pieces, each of which is limited by two support piles 2 adjacent in the horizontal direction, so as to form a layer of retaining wall in the horizontal direction. Since this scheme is constructed in reverse construction, it is constructed layer by layer from top to bottom, and the top edge of the pile plate body 1 at the top layer is flush, and a crown beam 3 is arranged on its upper part.

[0035] In this embodiment, several sheets of the pile plate bodies 1 are also connected in the longitudinal direction, so that a longitudinally continuous retaining wall is formed between two adjacent supporting piles 2. During construction, the supporting piles 2 are arranged first, and then the retaining wall is constructed layer by layer from top to bottom, and the pile plate bodies 1 adjacent to each other in the longitudinal direction are connected to each other, so that the longitudinal retaining wall is continuous and has better quality.

[0036] In this embodiment, the support pile 2 is fixed to the side wall of the foundation pit by anchor cables 4, and the anchor cables 4 are inclined downward from the outside to the inside. Each support pile 2 is provided with a plurality of anchor cables 4 arranged in the longitudinal direction, so as to improve the supporting capacity of the support pile 2 and ensure the effective construction of the pile plate body 1.

[0037] In this embodiment, a formwork support rod assembly is also included, and the formwork support rod assembly includes a bottom formwork support rod 5 and a top formwork support rod 6;

[0038] The front end of the bottom formwork rod 5 is detachably hinged to the bottom of the pile board body 1, and the front end of the top formwork rod 6 is detachably hinged to the top of the pile board body 1;

[0039] The rear end of the bottom mold support rod 5 and the rear end of the top mold support rod 6 are hingedly arranged;

[0040] The formwork support rod assembly further comprises a positioning lock 7, and the positioning lock 7 is used to determine the hinge angle of the bottom formwork rod 5 and the top formwork rod 6.

[0041] As shown in the figure, the formwork support rod assembly is formed by two telescopic rods hinged at the rear end to form the main body, and a positioning lock 7 is set at the end of the hinged telescopic rod to ensure the formwork angle and stability, that is, the pin shafts hinged to the two telescopic rods and the ends of the two telescopic rods have locking positions of the positioning lock 7. In this scheme, pin holes are arranged circumferentially around the pin shafts to ensure that the positioning lock 7 locks the rear ends of the two telescopic rods. The front ends of the two telescopic rods are correspondingly hinged on the pile board body 1 and form a triangular stable support structure with the pile board body 1. This scheme abandons the traditional formwork structure and utilizes the adjustability of the telescopic rod to adapt to any formwork space, especially the situation that it is difficult to support the formwork in a narrow position can be solved, and the position reliability of the pile board body 1 can be improved;

[0042] In this solution, there are two groups of formwork support rod assemblies, and the two groups of formwork support rod assemblies are respectively and correspondingly arranged on both sides of the lateral side of the pouring port to improve the pouring quality.

[0043] In this embodiment, a mold bottom blocking block 8 is further included, and a pouring cavity is formed between the pile plate body 1 and the side wall of the foundation pit, and the mold bottom blocking block 8 is controlled to close the bottom of the pouring cavity. The mold bottom blocking block 8 can improve the pouring quality.

[0044] This solution also discloses a deep foundation pit construction method based on the deep foundation pit support structure, comprising the following construction steps:

[0045] S1. Fix the support pile 2 at the designated position of the foundation pit through the anchor cable 4;

[0046] S2. Arrange the pile sheet body 1, and set the bottom mold block 8 between the pile sheet body 1 and the side wall of the foundation pit;

[0047] S3. Adjust the formwork support rod assembly so that the pile body 1 is limited at a specified position;

[0048] S4 pouring concrete into the pouring cavity, when the concrete overflows from the gap closed movable plate 12;

[0049] S5. Repeat steps S2-S4 from top to bottom to complete the construction;

[0050] The bottom of the last pile board body 1 is not provided with a bottom mold stopper 8 .

[0051] The use of this construction method can effectively avoid the situation where the construction joints are not poured densely or fully, ensure the quality of concrete construction and appearance, satisfy the workers' need to pour the concrete in one go, improve the construction efficiency of operators, reduce quality risks, and achieve the expected purpose.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A deep foundation pit support structure, characterized in that: It includes a pile plate body, a pouring port is reserved at the bottom end of the pile plate body, the bottom edge of the pile plate body is inclined from outside to inside and upward toward the pouring port, so that a concrete collecting section is formed at the bottom of the pile plate body, and the top edge of the pile plate body is consistent with the bottom line of the concrete collecting section.

2. The deep foundation pit support structure according to claim 1 is characterized in that: The top edge of the pile plate body has a notch corresponding to the pouring port, and a movable plate is arranged in the notch. The movable plate is driven to block the notch or expose the notch.

3. The deep foundation pit support structure according to claim 1 is characterized in that: It also includes a plurality of support piles, wherein the plurality of support piles are arranged at intervals in the transverse direction; The pile plate body is composed of a plurality of pieces, and each piece of the pile plate body is limited by two support piles adjacent to each other in the transverse direction, so as to form a layer of retaining wall in the transverse direction.

4. The deep foundation pit support structure according to claim 3 is characterized in that: Several pieces of the pile plate bodies are also connected in the longitudinal direction so that a longitudinally continuous retaining wall is formed between two adjacent supporting piles.

5. The deep foundation pit support structure according to claim 3 is characterized in that: The support piles are fixed to the side walls of the foundation pit by anchor cables, and the anchor cables are inclined downward from the outside to the inside.

6. The deep foundation pit support structure according to claim 5 is characterized in that: The anchor cables installed on each supporting pile are several in number and arranged longitudinally.

7. The deep foundation pit support structure according to claim 1 is characterized in that: Also included is a formwork support rod assembly, the formwork support rod assembly including a bottom formwork rod and a top formwork rod; The front end of the bottom formwork rod is detachably hinged to the bottom of the pile board body, and the front end of the top formwork rod is detachably hinged to the top of the pile board body; The rear end of the bottom formwork rod and the rear end of the top formwork rod are hingedly arranged.

8. The deep foundation pit support structure according to claim 7 is characterized in that: The formwork support rod assembly further comprises a positioning lock, which is used to determine the hinge angle of the bottom formwork rod and the top formwork rod.

9. The deep foundation pit support structure according to claim 3 is characterized in that: It also includes a mold bottom blocking block, and a pouring cavity is formed between the pile plate body and the side wall of the foundation pit. The mold bottom blocking block is controlled to close the bottom of the pouring cavity.

10. A deep foundation pit construction method based on the deep foundation pit support structure according to any one of claims 1 to 9, characterized in that: The construction steps include: S1. Fix the support piles at the designated position of the foundation pit through anchor cables; S2. Arrange the pile sheet body and set a bottom mold block between the pile sheet body and the side wall of the foundation pit; S3. Adjust the formwork support rod assembly so that the pile plate body is limited at the specified position; S4. Pour concrete into the pouring cavity and close the movable plate when the concrete overflows from the notch; S5. Repeat steps S2-S4 from top to bottom to complete the construction; No mold bottom blocking block is provided at the bottom of the last pile board body.

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