WO2023077867A1

WO2023077867A1 - Supporting structure and construction method therefor

Info

Publication number: WO2023077867A1
Application number: PCT/CN2022/106493
Authority: WO
Inventors: 陈云峰; 高战祥; 许朝敬; 赵海龙; 汤润江; 舒永峥; 潘光昱
Original assignee: 中建科工集团有限公司
Priority date: 2021-11-05
Filing date: 2022-07-19
Publication date: 2023-05-11
Also published as: CN113981984A

Abstract

Disclosed in the present invention are a supporting structure and a construction method therefor. The supporting structure is used for supporting a foundation pit, and comprises: a supporting pile and a soil retaining wall. The supporting pile can be located in a foundation; and the soil retaining wall comprises a base and a soil retaining portion, the soil retaining portion is connected to an upper surface of the base, the base is connected to an upper end of the supporting pile, the soil retaining portion is provided with a second soil-facing face, the second soil-facing face extends in an axis direction of the supporting pile, the upper surface of the base comprises a first soil-facing face, and a center point of the first soil-facing face is located on one side of an axis of the supporting pile facing the supporting pile along the second soil-facing face. After soil backfilling of the foundation pit, the second soil-facing face and the first soil-facing face are subjected to pressure of backfill soil, and an opposite bending moment is generated at the bottom of the supporting pile so as to offset the pressure, so that the safety of the supporting structure is improved; and in addition, the requirement of the strength of steel bars can be reduced, so that the cost is reduced.

Description

Support structure and its construction method

technical field

The invention relates to the technical field of support, in particular to a support structure and a construction method thereof.

Background technique

The commonly used construction method for support piles is bored piles. After the pouring is completed, the support piles are subjected to a large lateral pressure of the soil, which causes a large bending moment at the bottom of the support piles and increases the safety risk of the support piles. To ensure safety, it is necessary to have high-strength steel bars to support the supporting piles, and the cost is relatively high. In addition, during construction, the bored piles are greatly affected by the site and have high requirements for the site. The drilling rig needs to keep a certain safe distance from the surrounding buildings and the empty surface of the slope, and ensure the foundation bearing capacity and stability of the support pile construction surface. The stability and rigidity meet the requirements, and the construction safety risk of pile connection technology is high, and the construction period is long.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention proposes a support structure, which can reduce the bending moment on the bottom of the support structure, has high safety during construction, and has a fast construction period.

The present invention also proposes a construction method of the above-mentioned supporting structure.

The support structure according to the embodiment of the first aspect of the present invention is used for foundation pit support, including:

supporting piles capable of being located within the foundation;

The retaining wall includes a base and a retaining portion, the retaining portion is connected to the upper surface of the base, the base is connected to the upper end of the support pile, the retaining portion has a second earth-facing surface, The second soil-facing surface extends along the axial direction of the support pile, the upper surface of the base includes a first soil-facing surface, and the center point of the first soil-facing surface is located along the axis of the support pile. The second soil-facing surface faces one side of the support pile.

The support structure according to the embodiment of the present invention has at least the following beneficial effects:

After the soil of the foundation pit is backfilled, the second soil-facing surface of the retaining portion and the first soil-facing surface of the base can resist the backfill soil to prevent backfill soil loss. The backfill soil will exert a lateral thrust on the second soil-facing surface, causing the support structure to generate a negative bending moment at the bottom of the support pile (the direction of the bending moment is determined by the orientation of the second soil-facing surface, which is only for the convenience of description , it is not necessarily negative in practice, it may also be positive), the vertical downward pressure on the first soil-facing surface makes the bottom of the support pile produce a positive bending moment to offset the negative bending moment produced and improve The safety of the support structure, in addition, compared with the traditional technology, this embodiment can reduce the strength of the steel bar on the premise of improving the safety, so as to reduce the cost.

According to some embodiments of the present invention, an anchor cable is also included, one end of the anchor cable is connected to the retaining wall, and the other end is connected to the foundation on the side facing the second soil-facing surface;

And/or, one end of the anchor cable is connected to the upper end of the support pile, and the other end is connected to the foundation on the side facing the second soil-facing surface.

According to some embodiments of the present invention, the retaining wall further includes a reinforcement, one end of the reinforcement is connected to the second soil-facing surface, and the other end is connected to the second soil-facing surface.

According to some embodiments of the present invention, it also includes a pile front baffle, the pile front baffle is connected to the side of the support pile, the pile front baffle has a third soil-facing surface, and the third soil-facing surface The face faces the same direction as the second soil-facing face.

The support structure construction method according to the second aspect embodiment of the present invention is used to construct the support structure described in the above embodiment, comprising the following steps:

drilling holes in the foundation;

pouring in the hole to form the support pile;

The retaining wall is formed by pouring on the upper ends of the support piles.

The construction method of the supporting structure according to the embodiment of the present invention has at least the following beneficial effects: the construction period is short and the safety is high.

According to some embodiments of the present invention, the step of pouring the support piles includes:

Preparing reinforcement for supporting piles;

Put the support pile reinforcement into the hole;

Concrete is poured into the hole, and the upper end of part of the support pile reinforcement is located outside the concrete, and the support pile is formed after the concrete is solidified.

According to some embodiments of the present invention, the step of pouring the retaining wall includes:

A base mold is set on the upper end of the support pile;

Setting the base steel bar and the connecting steel bar in the base mold, and making the connecting steel bar partly located outside the base mold, and connecting the base steel bar with the support pile reinforcement;

Pour concrete into the base mold, and form the base after the concrete is solidified, and the connecting reinforcement part is located outside the base;

arranging reinforcement bars at the soil retaining portion on the upper surface of the base, and connecting the reinforcement bars at the soil retaining portion to the part of the connecting reinforcement located outside the base;

Enclosing with formwork around the reinforcement of the soil retaining portion to form a soil retaining portion mold;

Concrete is poured into the soil retaining part mold, and the soil retaining part is formed after the concrete solidifies.

A base mold is set on the upper end of the support pile;

setting the base reinforcement in the base mold, and connecting the base reinforcement to the support pile reinforcement;

Connect the soil retaining portion reinforcement on the base reinforcement;

A mold for the soil retaining part is formed around the reinforcement of the soil retaining part with a formwork, and the base mold communicates with the soil retaining part mold;

Concrete is poured into the base mold and the soil retaining part mold, and the retaining wall is formed after the concrete solidifies.

According to some embodiments of the present invention, pouring the retaining wall also includes the following steps:

A reinforcing steel bar is arranged between the base steel bar and the soil retaining part steel bar, and a reinforcement mold is set around the reinforcing bar, which is used for pouring to form a reinforcement, and the reinforcement is connected to the base and the Between the retaining parts.

According to some embodiments of the present invention, the following steps are further included: fixing one end of the anchor cable to the retaining wall, and fixing the other end to the side of the retaining wall along the second earth-facing surface. on the foundation;

And/or, one end of the anchor cable is fixed to the upper end of the support pile, and the other end is fixed to the foundation on the side of the support pile along the second soil-facing surface.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, wherein:

Fig. 1 is a schematic cross-sectional view of a support structure of an embodiment of the first aspect of the present invention;

Fig. 2 is a top view of the support structure of the embodiment of the first aspect of the present invention in Fig. 1;

Fig. 3 is the flow chart of the construction method of the support structure of the second aspect embodiment of the present invention;

Fig. 4 is the method flowchart of pouring support pile among Fig. 3;

Fig. 5 is the method flowchart of pouring retaining wall among Fig. 3;

FIG. 6 is a flow chart of another method for pouring the retaining wall in FIG. 3 .

Reference signs:

Support pile 100, axis 110;

Retaining wall 200, base 210, first soil facing surface 211, center point 2111, soil retaining portion 220, second soil facing surface 221, reinforcement 230;

The front baffle plate 300 of the pile, and the third earth-facing surface 310 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, several means more than one, and multiple means more than two. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

In the description of the present invention, reference to the terms "one embodiment," "some embodiments," "exemplary embodiments," "examples," "specific examples," or "some examples" is intended to mean that the embodiments are A specific feature, structure, material, or characteristic described by or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Fig. 1 is a schematic cross-sectional view of the support structure of the embodiment of the first aspect of the present invention, and Fig. 2 is a top view of the support structure of the embodiment of the first aspect of the present invention in Fig. The structure is used for foundation pit support, including: support piles 100 and retaining walls 200 .

Wherein, the support pile 100 can be located in the foundation (undisturbed soil of the foundation pit). The retaining wall 200 includes a base 210 and a retaining portion 220, the retaining portion 220 is connected to the upper surface of the base 210, the base 210 is connected to the upper end of the support pile 100, the retaining portion 220 has a second earth-facing surface 221, the second The soil-facing surface 221 extends along the axial direction of the support pile 100. The upper surface of the base 210 includes a first soil-facing surface 211. On the side facing the soil surface 221 , the second soil-facing surface 221 can receive the lateral pressure of the backfill soil, and the first soil-facing surface 211 can receive the vertical pressure of the backfill soil.

Specifically, it can be understood that the support structure of this embodiment is fixed on the foundation, and the support piles 100 are located inside the foundation, and the support piles 100 can be single row, double row or multiple rows, and usually each row will There are a plurality of support piles 100 . The retaining wall 200 is located outside the foundation. When the foundation pit is backfilled with soil, the backfill soil (soil backfilled into the foundation pit) squeezes the second soil-facing surface 221 of the retaining portion 220 and the first soil-facing surface of the base 210. The surface 211 , that is, the second soil-facing surface 221 and the upper surface of the base 210 can bear against the backfill to prevent the backfill from being lost. The backfill soil will exert a lateral thrust on the second soil-facing surface 221, so that the support structure will generate a negative bending moment at the bottom of the support pile 100 (the direction of the bending moment is determined by the orientation of the second soil-facing surface 221, here only For the convenience of description, it is not necessarily negative in practice, it may be positive), the vertical downward pressure on the first soil-facing surface 211, and because the center point 2111 of the first soil-facing surface 211 is located at the center point 2111 of the support pile 100 The axis 110 is vertically along the side facing the second soil-facing surface 221 , as shown in FIG. 2 . Therefore, the force received by the first soil-facing surface 211 (actually, the force received by the first soil-facing surface 211 is a uniform force, in order to clearly express the force point and direction of the moment, this application simplifies the uniform force as the first soil-facing surface The concentrated force received by the central point 2111 of the surface 211) will generate a positive bending moment at the bottom of the support pile 100, to offset the negative bending moment produced by the force received by part of the second soil-facing surface 221, and improve the support structure. safety. In addition, compared with the traditional technology, the support structure of this embodiment can reduce the strength requirement of the steel bar on the premise of ensuring safety, so as to reduce the cost.

On the basis of the above-mentioned embodiment, the support structure also includes an anchor cable (not shown in the figure), one end of the anchor cable is connected to the retaining wall 200, and the other end is connected to the retaining wall 200 along the second earth-facing surface 221 toward a side foundation. Alternatively, one end of the anchor cable is connected to the upper end of the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 . Alternatively, one end of the anchor cable is connected to the upper end of the retaining wall 200 and the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 .

Specifically, it can be understood that one end of the anchor cable is connected to the retaining wall 200, and the other end is connected to the foundation. When the second soil facing surface 221 is subjected to the lateral pressure of the backfill, the anchor cable will provide an The tensile force balances the force on the soil retaining portion 220, prevents the position of the support structure from changing, and improves the safety of the support structure. The same is true when one end of the anchor cable is connected to the upper end of the support pile 100 and the other end is connected to the foundation where the support pile 100 faces one side along the second soil-facing surface 221 , and will not be repeated here.

It should be noted that when the support structure of this embodiment needs to be provided with multiple anchor cables, one end of part of the anchor cables can also be connected to the retaining wall 200, and the other end can be connected to the retaining wall 200 along the second soil-facing surface 221 toward foundation on one side. One end of part of the anchor cable is connected to the upper end of the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil-facing surface 221 . One end of part of the anchor cable is connected to the upper end of the retaining wall 200 and the support pile 100 , and the other end is connected to the foundation of the support pile 100 facing one side along the second soil facing surface 221 .

Referring to FIG. 1 and FIG. 2 , in some embodiments, the retaining wall 200 further includes a reinforcement 230 , one end of the reinforcement 230 is connected to the first soil-facing surface 211 , and the other end is connected to the second soil-facing surface 221 . Specifically, when the second soil-facing surface 221 is subjected to the lateral pressure of the backfill, a large bending moment will be applied at the joint between the retaining portion 220 and the base 210 . Therefore, a reinforcing member 230 is added between the soil retaining portion 220 and the base 210. The reinforcing member 230 can be a buttress structure, a haunch structure, and a tie rod, etc. The reinforcing member 230 can improve the connection strength between the soil retaining portion 220 and the base 210, ensuring The retaining portion 220 does not break at the connection with the base 210, so as to improve the safety of the supporting structure. In addition, the cross section of the soil retaining portion 220 can be gradually increased from top to bottom, so that the connection between the soil retaining portion 220 and the base 210 has greater strength.

Referring to Fig. 1, in some embodiments, the support structure further includes a pile front baffle 300, the pile front baffle 300 is connected to the side of the support pile 100, the pile front baffle 300 has a third soil-facing surface 310, the third The orientation of the soil-facing surface 310 is the same as that of the second soil-facing surface 221 . Specifically, the pile front baffle 300 is located on the side of the support pile 100, and is located on the lower surface of the base 210 to support the base 210, and the third soil-facing surface 310 and the second soil-facing surface 221 are both facing the side of the backfill. The third soil-facing surface 310 of the pile front baffle 300 can block the backfill soil or the undisturbed soil of the foundation from moving between the support piles 100 to prevent water and soil loss. Wherein, the third soil-facing surface 310 of the pile front baffle 300 can be connected to the side of the support pile 100 , or the surface away from the third soil-facing surface 310 can be connected to the support pile 100 .

Referring to Fig. 3, Fig. 3 is a flow chart of the construction method of the support structure of the second aspect embodiment of the present invention, the construction method of the support structure of the second aspect embodiment of the present invention is used to build the support structure of the first aspect embodiment, Including the following steps:

S100, drilling a hole in the foundation;

S200, pouring in the hole to form a support pile 100;

S300, pouring the upper end of the support pile 100 to form the retaining wall 200 .

Specifically, a hole is drilled on the foundation by a drilling rig, and the diameter of the hole is determined according to the force that the support pile 100 needs to bear. After the hole is drilled, pour concrete into the hole. When multiple holes need to be drilled, when drilling the back hole, the previously drilled holes can be poured to speed up the construction. It should be noted that a certain distance should be kept between the pouring hole and the hole being drilled to ensure the safety of the construction. After all the supporting piles 100 are solidified and dried, the upper ends of the supporting piles 100 are poured to form a retaining wall 200, and the height of the retaining wall 200 is determined according to actual requirements.

It can be understood that the support structure construction method of this embodiment is compared with the support structure of the traditional support, and the upper part of the support pile 100 in the traditional technology is set as the retaining wall 200, that is, the support pile 100 inside the foundation, The exterior of the foundation is a retaining wall 200 . The drilling rig directly drills on the undisturbed soil without considering the distance between the drilling rig and the backfill slope, and the undisturbed soil has a high density, which has a high bearing capacity for the drilling rig and safer construction. In addition, there is no need for pile connection in this embodiment (pile connection: use high-altitude support to customize cylindrical formwork, the steel cage and formwork are high and not conducive to fixing, it is difficult to guarantee construction accuracy, high safety risks, difficult construction, and long construction period), Reduce construction risk, construction difficulty and construction period.

Referring to FIG. 4 , FIG. 4 is a flow chart of a method for pouring support piles in FIG. 3 . In some embodiments, the step of pouring support piles 100 includes:

S210, Preparing steel bars for support piles;

S220, placing support pile reinforcement in the hole;

S230, pouring concrete into the hole, and making part of the reinforcement of the support pile outside the concrete, and forming the support pile 100 after the concrete is solidified.

Specifically, ordinary single steel bars are welded or bundled to form tubular or cylindrical support pile reinforcements. The overall height of the support pile reinforcements is greater than the depth of the hole drilled by the drilling rig. Put the support pile reinforcements into the When inside a hole, there is allowance on the outside of the hole. Therefore, after the pouring of the support pile 100 is completed, a part of the support pile reinforcement is reserved outside the support pile 100 .

Referring to FIG. 5, FIG. 5 is a flowchart of a method for pouring a retaining wall in FIG. 3. In some embodiments, the step of pouring a retaining wall 200 includes:

S310, setting a base mold on the upper end of the support pile 100;

S320, setting the base reinforcement and the connecting reinforcement in the base mold, making the connecting reinforcement part outside the base mold, and connecting the base reinforcement with the support pile reinforcement;

S330, pour concrete into the base mold, and form the base 210 after the concrete solidifies;

S340, arranging reinforcement bars at the soil retaining portion on the upper surface of the base 210, and connecting the reinforcement bars at the soil retaining portion to the connecting reinforcement bars;

S350, forming a mold for the soil retaining portion by enclosing the reinforcement around the soil retaining portion with a template;

S360. Pour concrete into the soil retaining part mold, and form the soil retaining part 220 after the concrete solidifies.

Specifically, a base 210 is provided on the upper end of the support pile 100 to shape the base 210 . It should be noted that, in the above-mentioned embodiment, the steel bars of the support piles reserved outside the support pile 100 are located in the base mold, and the base steel bars are arranged in the base mold, and the base steel bars and the steel bars of the support piles are connected together by means of welding, etc. Strengthen the connection strength between the support pile 100 and the base 210 . In addition, the connecting reinforcement should be set on the base reinforcement. The connecting steel bars are connected to the base steel bars. When concrete is poured into the base mold to form the base 210, the connecting steel bars will be partially located on the upper surface of the base 210 for subsequent connection with the reinforcing bars of the retaining portion.

After the concrete of the base 210 is dried, the soil retaining reinforcement is provided on the upper surface of the base 210 near the support pile 100, and the soil retention reinforcement is connected to the connection reinforcement. After the reinforcing bars of the soil retaining part are set, formwork is used to enclose the reinforcing bars of the soil retaining part to form the mold of the soil retaining part. After that, concrete is poured into the mold of the soil retaining part, and the mold of the soil retaining part is removed after the concrete dries to form the soil retaining part 220 . The soil retaining mold can be made of templates, aluminum plates, steel plates and other materials.

It should be noted that the part of the upper surface of the base 210 that is not connected to the soil retaining portion 220 is the first soil facing surface 211, the side of the soil retaining portion 220 close to the first soil facing surface 211 is the second soil facing surface 221, and the first soil facing surface 221 The soil-facing surface 211 intersects with the second soil-facing surface 221 to form an included angle.

It should be noted that, in this embodiment, the base reinforcement is set after the support pile 100 is poured, which cannot be interpreted as the base reinforcement is erected after the support pile 100 is poured. It can be set according to actual construction conditions, such as:

1. The overall size of the support structure to be constructed is small. During the construction process, if the outline of the support structure can be ensured to remain unchanged, the base reinforcement can be built in advance. After all the support piles 100 are poured, the The base steel bars that have been built are placed in the base mold and connected with the support pile steel bars to improve construction efficiency.

2. The overall size of the support structure to be constructed is relatively large. During the construction process, if the outline of the support structure can be ensured to remain unchanged, you can choose to use the splicing method to divide the base steel bars into multiple parts for construction. After the pouring of the pile 100 is completed, each part of the base reinforcement is placed in the mold and spliced with each other to form a completed base reinforcement, which is connected with the support pile reinforcement to improve construction efficiency.

3. When the overall size of the support structure to be constructed is relatively large, and its overall outline is difficult to determine and remain unchanged during construction, after the support pile 100 is poured, build it directly on the support pile 100 liters, so as to Ensure construction accuracy.

In addition, setting the reinforcing bars of the soil retaining portion after the pouring of the base 210 is completed, similarly, it cannot be interpreted as erecting the reinforcing bars of the soil retaining portion after the pouring of the base 210 is completed, which will not be described here.

Referring to FIG. 6 , FIG. 6 is a flowchart of another method for pouring the retaining wall in FIG. 3 . In order to speed up the construction period, the base 210 and the retaining portion 220 are poured at the same time. Based on this, in some embodiments, the step of pouring the retaining wall 200 includes:

S310', the base mold is set on the upper end of the support pile 100;

S320', setting the base reinforcement in the base mold, and connecting the base reinforcement with the support pile reinforcement;

S330', connecting the reinforcement of the soil retaining part to the reinforcement of the base;

S340', form the mold of the soil retaining part by enclosing the reinforcement around the soil retaining part with a formwork, and the base mold is connected with the soil retaining part mold;

S350', pour concrete into the base mold and the soil retaining mold, and form the retaining wall 200 after the concrete solidifies.

In some embodiments, pouring the retaining wall 200 further includes the following steps:

Set reinforcing bar between base reinforcing bar and retaining part reinforcing bar, and set reinforcing part mold around reinforcing bar, to strengthen the connection strength of base 210 and retaining part 220, ensure that in use, retaining part 220 and base 210 will not break.

In some embodiments, the construction method of the supporting structure further includes the following steps: one end of the anchor cable is fixed to the retaining wall 200 , and the other end is fixed to the foundation of the retaining wall 200 on one side along the second soil-facing surface 221 . Or, one end of the anchor cable is fixed on the upper end of the support pile 100, and the other end is fixed on the foundation of the support pile 100 on the side facing the second soil-facing surface 221, or one end of the anchor cable is fixed on the retaining pile 100. The upper end of the wall 200 and the support pile 100 and the other end are fixed on the foundation of the retaining wall 200 facing one side along the second soil facing surface 221 . In order to improve the overall resistance of the support structure to lateral pressure.

In some embodiments, the supporting structure construction method also includes the following steps;

Dig trenches in the foundation;

The pile front baffle 300 is formed by pouring in the groove.

Specifically, a groove is dug on the foundation, and the pile front baffle reinforcement is placed in the groove, and concrete is poured into the groove to form the pile front baffle 300 . It should be noted that S100 and S500 are not limited in sequence, that is, you can dig a groove on the foundation first and then drill a hole, or you can drill a hole in the foundation first and then dig a groove. In addition, S200 and S600 are not limited in sequence. They can be poured first to form the pile front baffle 300 and then poured to form the support pile 100, or they can be poured first to form the support pile 100 and then poured to form the pile front 300. It is also possible to support The pile 100 and the pile front baffle 300 are poured at the same time to improve construction efficiency.

In addition, when drilling and slotting, the holes can be connected with the grooves, and the steel bars of the supporting piles can be connected with the reinforcing bars of the pile front baffles. Therefore, when the concrete is poured, the pile front baffle 300 and the supporting piles 100 form an integrated structure. Improves overall strength.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge of those of ordinary skill in the art, various modifications can be made without departing from the spirit of the present invention. Variety. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

Claims

The support structure is used for foundation pit support, which is characterized in that it includes:

supporting piles capable of being located within the foundation;

The retaining wall includes a base and a retaining portion, the retaining portion is connected to the upper surface of the base, the base is connected to the upper end of the support pile, the retaining portion has a second earth-facing surface, The second soil-facing surface extends along the axial direction of the support pile, the upper surface of the base includes a first soil-facing surface, and the center point of the first soil-facing surface is located along the axis of the support pile. The second soil-facing surface faces one side of the support pile.
The support structure according to claim 1, further comprising an anchor cable, one end of the anchor cable is connected to the retaining wall, and the other end is connected to the wall on the side facing the second soil-facing surface. said foundation;

And/or, one end of the anchor cable is connected to the upper end of the support pile, and the other end is connected to the foundation on the side facing the second soil-facing surface.
The support structure according to claim 1, wherein the retaining wall further includes a reinforcement, one end of the reinforcement is connected to the second soil-facing surface, and the other end is connected to the second soil-facing surface. dirt surface.
The support structure according to claim 1, further comprising a pile front baffle, the pile front baffle is connected to the side of the support pile, and the pile front baffle has a third soil-facing surface , the third soil-facing surface faces the same direction as the second soil-facing surface.
A support structure construction method for building the support structure described in any one of claims 1 to 4, characterized in that it comprises the steps of:

drilling holes in the foundation;

pouring in the hole to form the support pile;

The retaining wall is formed by pouring on the upper ends of the support piles.
The construction method of the support structure according to claim 5, wherein the step of pouring the support piles comprises:

Preparing reinforcement for supporting piles;

Put the support pile reinforcement into the hole;

Concrete is poured into the hole, and the upper end of part of the support pile reinforcement is located outside the concrete, and the support pile is formed after the concrete is solidified.
The construction method of the supporting structure according to claim 6, wherein the step of pouring the retaining wall comprises:

A base mold is set on the upper end of the support pile;

Setting the base steel bar and the connecting steel bar in the base mold, and making the connecting steel bar partly located outside the base mold, and connecting the base steel bar with the support pile reinforcement;

Pour concrete into the base mold, and form the base after the concrete is solidified, and the connecting reinforcement part is located outside the base;

arranging reinforcement bars at the soil retaining portion on the upper surface of the base, and connecting the reinforcement bars at the soil retaining portion to the part of the connecting reinforcement located outside the base;

Enclosing with formwork around the reinforcement of the soil retaining portion to form a soil retaining portion mold;

Concrete is poured into the soil retaining part mold, and the soil retaining part is formed after the concrete solidifies.
The construction method of the supporting structure according to claim 6, wherein the step of pouring the retaining wall comprises:

A base mold is set on the upper end of the support pile;

setting the base reinforcement in the base mold, and connecting the base reinforcement to the support pile reinforcement;

Connect the soil retaining portion reinforcement on the base reinforcement;

A mold for the soil retaining part is formed around the reinforcement of the soil retaining part with a formwork, and the base mold communicates with the soil retaining part mold;

Concrete is poured into the base mold and the soil retaining part mold, and the retaining wall is formed after the concrete solidifies.
The construction method of the supporting structure according to claim 8, wherein pouring the retaining wall also includes the following steps:

A reinforcing steel bar is arranged between the base steel bar and the soil retaining part steel bar, and a reinforcement mold is set around the reinforcing bar, which is used for pouring to form a reinforcement, and the reinforcement is connected to the base and the Between the retaining parts.
The construction method of the supporting structure according to claim 5, further comprising the step of fixing one end of the anchor cable to the retaining wall, and fixing the other end to the retaining wall along the second wall. on said foundation on the facing side of the soil surface;

And/or, one end of the anchor cable is fixed to the upper end of the support pile, and the other end is fixed to the foundation on the side of the support pile along the second soil-facing surface.