Waterproof support construction structure for ultra-deep double-row cast-in-place columns close to subway

Abstract

The utility model provides an ultra-deep double-row cast-in-place column waterproof support construction structure close to a subway, which comprises a water stop structure and a water stop wall, and the water stop structure is used for supporting a foundation pit structure; the foundation pit structure comprises a foundation pit, a foundation pit slope and a natural ground, the bottom of the foundation pit is lower than the natural ground, and the natural ground is connected with the bottom of the foundation pit through the foundation pit slope; the water stop structure is arranged in a foundation pit and comprises two sets of water stop curtains and water stop belts, the water stop curtains extend in the extending direction of a foundation pit slope, the water stop curtains close to the foundation pit slope make contact with the inner wall of the foundation pit, and the water stop belts are arranged between the water stop curtains. According to the ultra-deep double-row cast-in-place column waterproof support construction structure close to the subway, the two jet grouting piles are arranged in the gap of the fender pile slope in a jet grouting mode, the water stopping capacity is improved, meanwhile, support on the fender pile slope is enhanced through the jet grouting piles, the jet grouting piles and the slope protection piles are connected into a whole in the mode that the embedded parts are embedded, and the waterproof support strength is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a foundation pit waterproof support, especially point to near subway superdeep double row cast-in-place pile waterproof support construction structure. BACKGROUND

[0002] Superdeep double row cast-in-place pile waterproof support construction is a kind of complex foundation pit engineering technology, especially suitable for the scene needing to provide stability and waterproof performance in deep underground environment, generally when excavating foundation pit, groundwater level is reduced by excavating dewatering well, thereby reducing soil moisture content.

[0003] And there is strong particularity in carrying out superdeep double row cast-in-place pile waterproof support construction near subway, need to have strong water stop capacity, avoid the seepage in foundation pit to seep into the soil between foundation pit and subway to cause influence to normal operation of subway, generally continuous water stop barrier is formed by deep mixing pile or high-pressure rotary jet pile in prior art to carry out water stop, and horizontal displacement and ground subsidence generated in the process of foundation pit excavation need to be strictly controlled, avoid too large pressure or deformation to subway tunnel.

[0004] In the process of supporting double row cast-in-place pile, due to the large depth of foundation pit, the soil pressure on double row cast-in-place pile is large, and rotary jet pile is directly rotary jeted in the gap of slope protection pile, and single rotary jet pile is difficult to completely block the gap, and seepage can seep into the soil in the gap of slope protection pile through the side not rotary jeted, so as to cause soil softening, thereby causing insufficient bearing capacity of cast-in-place pile. UTILITY MODEL CONTENTS

[0005] In order to solve the problem that single rotary jet pile is difficult to completely block the gap of slope protection pile in the background art, the utility model provides a superdeep double row cast-in-place pile waterproof support construction structure near subway.

[0006] The technical scheme of the utility model is as follows: a water stop structure and a water stop wall are included, the water stop structure is used for supporting the foundation pit structure;

[0007] The foundation pit structure includes a foundation pit, a foundation pit slope and a natural ground, the bottom of the foundation pit is lower than the natural ground, and the natural ground and the bottom of the foundation pit are connected by the foundation pit slope;

[0008] The water stop structure is arranged in the foundation pit, and the water stop structure includes two groups of water stop curtains and a water stop belt, the water stop curtains extend along the extension direction of the foundation pit slope, the water stop curtains close to the foundation pit slope are in contact with the inner wall of the foundation pit, the water stop belts are arranged between the water stop curtains, the top of the two groups of water stop curtains and the top of the water stop belt are flush and form a mounting surface, and the mounting surface has a corbel;

[0009] The waterproof curtain comprises a plurality of slope protection piles, which are arranged and spaced along the extending direction of the foundation pit slope, a rotary jet gap is left between adjacent slope protection piles, two rotary jet piles are arranged between the two adjacent slope protection piles, the two rotary jet piles are arranged and spaced along a tangent direction of the arrangement direction of the slope protection piles, the rotary jet piles fill the rotary jet gap, and the upper ends of the slope protection piles and the rotary jet piles are flush.

[0010] Preferably, a waterproof layer is laid on the mounting surface, a steel reinforcement cage is arranged in the slope protection pile, the upper part of the steel reinforcement cage penetrates the top of the slope protection pile to form a reserved steel reinforcement cage, and the upper end of the reserved steel reinforcement cage penetrates the waterproof layer.

[0011] Preferably, a pre-embedded rod is embedded in the rotary jet pile, a plurality of connecting rods extending in the front-rear direction are fixedly connected between the pre-embedded rods on the front and rear rotary jet piles, and the connecting rods are arranged and spaced in the up-down direction.

[0012] Preferably, a plurality of groups of connecting steel reinforcements are arranged between the two adjacent reserved steel reinforcement cages, the groups of connecting steel reinforcements are arranged and spaced in the up-down direction, each group of connecting steel reinforcements comprises a plurality of connecting steel reinforcements, the connecting steel reinforcements are arranged and spaced in the horizontal direction in the reserved steel reinforcement cage, the connecting steel reinforcements extend along the extending direction of the foundation pit slope, and the two ends of the connecting steel reinforcements are welded to the adjacent reserved steel reinforcement cages.

[0013] Preferably, the pre-embedded rod is provided with a through reserved hole for the connecting steel reinforcement to penetrate.

[0014] Preferably, the connecting rod and the adjacent connecting steel reinforcement form an auxiliary support structure, the connecting steel reinforcement is located above the adjacent connecting rod, and the connecting steel reinforcement is lapped on the connecting rod.

[0015] Preferably, the plurality of reserved steel reinforcement cages, the plurality of groups of connecting steel reinforcements and the plurality of connecting rods form a pouring steel reinforcement cage structure, the pouring steel reinforcement cage structure is poured with concrete to form a crown beam, and the crown beam is arranged on the waterproof layer.

[0016] Preferably, the waterproof belt comprises two gravel belts and a waterproof belt, the two gravel belts are provided with the waterproof belt therebetween, and the gravel belts and the waterproof belt extend along the extending direction of the waterproof curtain.

[0017] Preferably, a slope protection layer is arranged on the foundation pit slope.

[0018] Preferably, the waterproof wall is arranged on the natural ground, and the waterproof wall is arranged around the foundation pit to prevent external water flow from flowing into the foundation pit.

[0019] The utility model discloses the advantages: through the rotary jet two rotary jet piles in the clearance between the slope protection pile, improves waterproofly, simultaneously through the rotary jet pile, improves the bearing capacity of slope protection pile, simultaneously through connecting steel reinforcement, the top of rotary jet pile and the top of slope protection pile are connected as a whole, improves the whole waterproof support ability. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 It is a schematic diagram of the main structure of embodiment 1.

[0022] Figure 2 It is a schematic diagram of the water stop structure. Figure 1

[0023] Figure 3 It is a schematic diagram of the water stop curtain structure.

[0024] Figure 4 It is a schematic diagram of the pouring reinforcement cage structure.

[0025] In the figure, 1 is a slope pile, 2 is a rotary jet pile, 3 is a gravel belt, 4 is a waterproof belt, 5 is a waterproof layer, 6 is a crown beam, 7 is a slope layer, 8 is a water stop wall, 9 is a reserved steel bar, 10 is a pre-buried rod, 11 is a connecting rod, and 12 is a connecting steel bar. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0027] Embodiment 1: Aiming at proposing a waterproof supporting construction structure of super-deep double-row cast-in-place piles near a subway.

[0028] According to the drawings shown, it comprises a water stop structure and a water stop wall 8. Figures 1-4

[0029] The water stop structure is used for supporting the foundation pit structure, which comprises a foundation pit, a foundation pit slope and a natural ground. The bottom of the foundation pit is lower than the natural ground, and the natural ground and the bottom of the foundation pit are connected through the foundation pit slope.

[0030] ​​The water stop structure is arranged in the foundation pit, and the water stop structure comprises two groups of water stop curtains and a water stop belt. The water stop curtains extend along the extending direction of the foundation pit slope, and the water stop curtains close to the foundation pit slope are in contact with the inner wall of the foundation pit, thereby supporting the foundation pit. The water stop curtain comprises a plurality of slope protection piles 1, which are arranged in an array and spaced apart along the extending direction of the foundation pit slope. A rotary jet gap is left between adjacent slope protection piles 1. Two rotary jet piles 2 are arranged between adjacent two slope protection piles 1, and the two rotary jet piles 2 are arranged in a tangential direction to the arrangement direction of the slope protection piles 1. The rotary jet piles 2 fill the rotary jet gap. The upper ends of the slope protection piles 1 and the rotary jet piles 2 are flush. In this embodiment, the slope protection piles 1 and the rotary jet piles 2 are both formed by using the construction method in the prior art. The slope protection pile 1 is formed by first drilling a pile hole, then lowering a supporting cylinder, and finally pouring concrete in the supporting cylinder. The rotary jet pile 2 is formed by rotary jetting concrete in the gap between the slope protection piles 1 by using the concrete rotary jetting process, thereby filling the gap between the slope protection piles 1.

[0031] A water stop belt is arranged between the water stop curtains. The water stop belt comprises two gravel belts 3 and a waterproof belt 4. The waterproof belt 4 is arranged between the two gravel belts 3. The gravel belts 3 and the waterproof belt 4 both extend along the extending direction of the water stop curtain. The top portions of the two groups of water stop curtains and the top portion of the water stop belt are flush and form a mounting surface. In this embodiment, the waterproof belt 4 can be made of waterproof geotextile.

[0032] A waterproof layer 5 is arranged on the mounting surface. In this embodiment, the waterproof layer 5 can be made of waterproof concrete to which a waterproof agent is added. A steel reinforcement cage is arranged in the slope protection pile 1. The upper portion of the steel reinforcement cage penetrates the top portion of the slope protection pile 1 to form a reserved steel reinforcement cage 9. The upper end of the reserved steel reinforcement cage 9 penetrates the waterproof layer 5, so that water seepage is prevented from penetrating into the water stop curtain through the top portion.

[0033] A pre-embedded rod 10 is embedded in the rotary jet pile 2. The pre-embedded rod 10 is vertically inserted into the rotary jet pile 2 when the concrete strength of the rotary jet pile 2 does not meet the standard. The pre-embedded rod 10 is fixed in the rotary jet pile 2 when the concrete strength is formed. A plurality of connecting rods 11 extending in the front-rear direction are fixedly connected between the pre-embedded rods 10 on the front and rear rotary jet piles 2. The connecting rods 11 are arranged in the up-down direction.

[0034] A plurality of groups of connecting steel bars 12 are arranged between adjacent two reserved steel reinforcement cages 9. The groups of connecting steel bars 12 are arranged in the up-down direction. Each group of connecting steel bars 12 comprises a plurality of connecting steel bars 12, which are arranged in an array and spaced apart in the horizontal direction of the reserved steel reinforcement cage 9. The connecting steel bars 12 extend along the extending direction of the foundation pit slope. The two ends of the connecting steel bars 12 are both welded to the adjacent reserved steel reinforcement cages 9. The pre-embedded rods 10 and the reserved steel reinforcement cages 9 are connected into one body by the connecting steel bars 12, thereby enhancing the support strength of the upper portions of the rotary jet piles 2 and the slope protection piles 1.

[0035] The embedded rod 10 is provided with a through reserved hole for the connecting steel bar 12 to pass through, so as to facilitate the connection of the connecting steel bar 12 and the embedded rod 10.

[0036] The connecting rod 11 and the adjacent connecting steel bar 12 form an auxiliary support structure, the connecting steel bar 12 is located above the adjacent connecting rod 11, and the connecting steel bar 12 is lapped on the connecting rod 11, the connecting rod 11 assists in supporting the connecting steel bar 12, and the bearing capacity of the connecting steel bar 12 is improved.

[0037] The plurality of reserved steel bar cages 9, the plurality of groups of connecting steel bars 12 and the plurality of connecting rods 11 form a pouring steel bar cage structure, the pouring steel bar cage structure pours concrete to form the crown beam 6, the crown beam 6 is arranged on the waterproof layer 5, and the two rows of waterproof curtains are connected together through the crown beam 6, and the bearing capacity is improved.

[0038] The slope protection layer 7 is arranged on the foundation pit slope, and the waterproof capacity of the slope support is improved.

[0039] The waterproof wall 8 is arranged on the natural ground, and the waterproof wall 8 is arranged around the foundation pit, so as to prevent external water flow from flowing into the foundation pit.

[0040] Therefore, the front and rear direction gaps of the slope protection pile 1 are blocked by the two rotary jet piles 2 in the slope protection pile 1, so that water is prevented from seeping into the soil between the slope protection piles 1, the soil around the slope protection piles 1 is prevented from being soft, the waterproof property is improved, the embedded rod 10 is embedded in the rotary jet pile 2, the reserved steel bar cage 9 and the embedded rod 10 are connected into one through the connecting steel bar 12, the slope protection pile 1 and the rotary jet pile 2 are connected into one, and the supporting and bearing capacities are improved.

[0041] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-restrictive in any respect, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A waterproof support structure for ultra-deep double-row cast-in-place columns near a subway station, characterized by: The application relates to a water-stop structure and a water-stop wall (8) for supporting a foundation pit structure; The foundation pit structure comprises a foundation pit, a foundation pit slope and a natural ground, the bottom of the foundation pit is lower than the natural ground, and the natural ground and the bottom of the foundation pit are connected through the foundation pit slope; The water-stop structure is arranged in the foundation pit, the water-stop structure comprises two groups of water-stop curtains and a water-stop belt, the water-stop curtains extend along the extending direction of the foundation pit slope, the water-stop curtains close to the inner wall of the foundation pit are in contact with the inner wall of the foundation pit, the water-stop belts are arranged between the water-stop curtains, the top of the two groups of water-stop curtains and the top of the water-stop belt are flush and form a mounting surface, and a corbel (6) is arranged on the mounting surface. The water-stop curtain comprises a plurality of slope protection piles (1), the plurality of slope protection piles (1) are arranged in an array and at intervals along the extending direction of the foundation pit slope, a rotary-spraying gap is left between adjacent slope protection piles (1), two rotary-spraying piles (2) are arranged between the two adjacent slope protection piles (1), the two rotary-spraying piles (2) are arranged in an array and at intervals along a direction tangent to the arrangement direction of the slope protection piles (1), the rotary-spraying piles (2) fill the rotary-spraying gap, and the upper ends of the slope protection piles (1) and the rotary-spraying piles (2) are flush.

2. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 1, characterized in that: A waterproof layer (5) is arranged on the mounting surface, a steel reinforcement cage is arranged in the slope protection pile (1), the upper portion of the steel reinforcement cage passes through the top of the slope protection pile (1) to form a reserved steel reinforcement cage (9), and the upper end of the reserved steel reinforcement cage (9) passes through the waterproof layer (5).

3. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 2, characterized in that: A pre-buried rod (10) is arranged in the rotary-spraying pile (2), a plurality of connecting rods (11) extending in the front-rear direction are fixedly connected between the pre-buried rods (10) on the front and rear rotary-spraying piles (2), and the connecting rods (11) are arranged in an array and at intervals in the up-down direction.

4. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 3, characterized in that: A plurality of connecting steel reinforcements (12) are arranged between the two adjacent reserved steel reinforcement cages (9), the plurality of connecting steel reinforcements (12) are arranged in an array and at intervals in the up-down direction, each group of connecting steel reinforcements (12) comprises a plurality of connecting steel reinforcements (12), the connecting steel reinforcements (12) are arranged in an array and at intervals in the horizontal direction in the reserved steel reinforcement cage (9), the connecting steel reinforcements (12) extend along the extending direction of the foundation pit slope, and the two ends of the connecting steel reinforcements (12) are welded to the adjacent reserved steel reinforcement cages (9).

5. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 4, characterized in that: The pre-buried rod (10) is provided with a through reserved hole for the connecting steel reinforcement (12) to pass through.

6. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 5, characterized in that: The connecting rod (11) and the adjacent connecting steel reinforcement (12) form an auxiliary support structure, the connecting steel reinforcement (12) is located above the adjacent connecting rod (11), and the connecting steel reinforcement (12) is lapped on the connecting rod (11).

7. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to claim 6, characterized in that: The plurality of reserved steel reinforcement cages (9), the plurality of groups of connecting steel reinforcements (12) and the plurality of connecting rods (11) form a pouring steel reinforcement cage structure, the pouring steel reinforcement cage structure pours concrete to form the corbel (6), and the corbel (6) is arranged on the waterproof layer (5).

8. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to any one of claims 1-7, characterized in that: The water-stop belt comprises two gravel belts (3) and a waterproof belt (4), the waterproof belt (4) is arranged between the two gravel belts (3), and the gravel belt (3) and the waterproof belt (4) extend along the extending direction of the water-stop curtain.

9. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to any one of claims 1-7, characterized in that: A slope protection layer (7) is arranged on the foundation pit slope.

10. The waterproof supporting construction structure for the adjacent subway super-deep double-row cast-in-place column according to any one of claims 1-7, characterized in that: The water-stop wall (8) is arranged on the natural ground, the water-stop wall (8) is arranged around the foundation pit to prevent external water flow from flowing into the foundation pit.

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