CN211646351U

CN211646351U - Cast-in-situ bored pile

Info

Publication number: CN211646351U
Application number: CN201921708972.0U
Authority: CN
Inventors: 朱毅敏; 徐磊; 王彬楠; 张文军; 张佳; 陈宇
Original assignee: Shanghai Construction No 1 Group Co Ltd
Current assignee: Shanghai Construction No 1 Group Co Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-10-09
Anticipated expiration: 2029-10-08

Abstract

The utility model discloses a bored concrete pile, including the stake hole that pierces through the upper strata soil horizon, pressure-bearing water layer and the lower soil horizon that lies in the horizon in proper order, be provided with the steel reinforcement cage in the stake hole and be used for replacing the reinforced concrete column that is used for resisting the concrete formation of the heavy proportion mud that the pressure-bearing water layer upwards gushes. The utility model discloses can be under construction at the soil body environment that has the confined water layer, reduce the construction degree of difficulty of drilling bored concrete pile.

Description

Cast-in-situ bored pile

Technical Field

The utility model relates to a building engineering technical field, in particular to drilling bored concrete pile.

Background

In the process of developing the underground space of a building, a vertical supporting system formed by engineering piles and cast-in-situ bored piles is generally adopted. In the process of constructing the cast-in-situ bored pile for the existing basement or the newly-built basement, when the cast-in-situ bored pile penetrates through a pressure-bearing water layer along a soil body by drilling downwards, pressure-bearing water can gush upwards, so that the cast-in-situ bored pile cannot be constructed in the soil body environment with the pressure-bearing water layer. Thereby improving the difficulty of the downward continuous drilling construction of the cast-in-situ bored pile.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a drilling bored concrete pile is provided to solve the difficult problem of construction when piercing through the confined water layer.

In order to solve the technical problem, the utility model provides a bored concrete pile, including the stake hole that pierces through the upper strata soil horizon, confined water layer and the lower strata soil horizon that lies in the horizon in proper order, be provided with the steel reinforcement cage in the stake hole and be used for replacing the reinforced concrete column that is used for resisting the concrete formation of the big proportion mud that the confined water layer upwards gushes.

Further, the utility model provides a bored concrete pile, bored concrete pile sets up below the bottom floor of existing basement.

Further, the utility model provides a bored concrete pile, bored concrete pile sets up below the foundation ditch of newly-built basement.

Compared with the prior art, the utility model provides a bored concrete pile upwards gushes through the groundwater of injecting the heavy proportion mud in order to resist in the confined water layer in the stake hole to through piercing through confined water layer construction bored concrete pile. The large-specific-gravity slurry not only presses underground water gushing caused by a bearing water layer, but also can ensure the stability of the hole wall of the pile hole, prevent the pile hole from collapsing and reduce the construction difficulty of the cast-in-situ bored pile. The utility model provides a bored concrete pile is located lower upper soil body layer, confined water layer and the lower soil body layer of horizon, can be under construction at the soil body environment that has the confined water layer. The utility model provides a bored concrete pile for the reinforced concrete column that the concrete of replacement large proportion mud and steel reinforcement cage constitute has improved bored concrete pile steadiness.

Drawings

Fig. 1 to 9 are schematic views illustrating a construction process of a bored pile according to an embodiment of the present invention;

fig. 10 to 11 are schematic structural views illustrating the distribution of concrete floor drilling holes according to an embodiment of the present invention;

fig. 12 is a flow chart of a bored pile according to an embodiment of the present invention.

Shown in the figure: 101. the method comprises the following steps of casing, 102, grouting equipment, 103, drilling equipment, 104, mud with large specific gravity, 105, a reinforcement cage, 106, a concrete guide pipe, 107, concrete, 200, a ground level, 201, an upper soil layer, 202, a pressure water layer, 203, a lower soil layer, 204, pile holes, 300, a position line, 400 and drilling.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

referring to fig. 12, an embodiment of the present invention provides a method for constructing a cast-in-situ bored pile, including:

step 501, please refer to fig. 1, a position line of the bored pile to be constructed is released on the ground level 200.

Step 502, referring to fig. 1, burying the casing 101 downwards along the position line, so that the casing 101 is partially exposed above the ground plane 200.

Step 503, referring to fig. 2 to 3, drilling the upper soil layer 201, the confined water layer 202 and the lower soil layer 203 below the ground level 200 through the casing 101 by using the drilling equipment 103 to form a pile hole 204, and injecting the high specific gravity mud 104 into the pile hole 204 through the grouting equipment 102 during the drilling process to resist the upward gushing of the groundwater in the confined water layer 202, wherein the mud specific gravity of the high specific gravity mud 104 is 12kN/m³The above.

In step 504, referring to fig. 4, after the drilling equipment 103 drills holes through the lower soil layer 203 to make the pile holes 204 reach a predetermined depth, the grouting equipment 102 stops grouting, and the reinforcement cage 105 is hung in the pile holes 204.

Step 505, referring to fig. 5 to 7, after the reinforcement cage 105 is installed, the concrete guide pipe 106 is inserted into the pile hole 204, the concrete 107 is poured into the pile hole 204 through the concrete guide pipe 106, and the mud 104 with large specific gravity injected into the pile hole 204 is squeezed out during the process of pouring the concrete 107.

In step 506, referring to fig. 8, after the concrete 107 is poured into the pile hole 204, the concrete pipe 106 is pulled out.

In step 507, referring to fig. 9, after the concrete 107 in the pile hole 204 reaches the predetermined strength to form the reinforced concrete column, the casing 101 is pulled out. For example, the pile casing 101 is pulled out after concrete pouring is completed for 2 hours, and the reinforced concrete column head is cut off by using a hydraulic splitter, so that the reinforced concrete column head is integrally broken. The predetermined strength may be that the reinforced concrete column is completely solidified or that the reinforced concrete column is not completely solidified.

Step 508, referring to fig. 9, removing the reinforced concrete column above the ground level 200 to form a bored pile.

The embodiment of the utility model provides a construction method of bored concrete pile, after grouting equipment 102 stops the slip casting, before steel reinforcement cage 105 installs and accomplishes, clear hole for the first time to stake hole 204. After the concrete pipe 106 is inserted, the pile hole 204 is cleaned a second time. Cleaning the pile hole 204 can remove larger soil blocks or obstacles in the pile hole 204, so as to improve the formation of the reinforced concrete column with stable structure by pouring concrete 107 in the pile hole 204.

Referring to fig. 7, in the construction method of the bored pile according to the embodiment of the present invention, when the concrete 107 is poured into the pile hole 204, the concrete guide pipe 106 is gradually lifted upward until the concrete 107 is poured into the pile hole 204, and the concrete guide pipe 106 is pulled out from the pile hole 204. Gradually pulling up the concrete pipe 106 enables the concrete 107 to gradually displace the heavy weight mud 104 from the bottom of the pile hole 204 upwards.

The embodiment of the utility model provides a construction method of bored concrete pile, slip casting equipment 102 includes the grouting pump, with the slip casting pipe and the grout outlet pipe of grouting pump intercommunication, and with the mud case of slip casting pipe and grout outlet pipe intercommunication, the mud case includes mud sedimentation tank and mud circulation pond, the slip casting pipe intercommunication the mud circulation pond, grout outlet pipe intercommunication the mud sedimentation tank.

Referring to fig. 3, in the construction method of a bored pile according to an embodiment of the present invention, the drilling device 103 is a water drilling machine, and the water drilling machine includes a drill rod and a drill bit. The drilling apparatus 103 may employ a drilling machine known in the art.

Referring to fig. 10 to 11, in the method for constructing a bored pile according to an embodiment of the present invention, when a concrete slab is included on a ground plane 200, a position line is located on the concrete slab, and holes are formed by drilling 400 in a circular matrix manner along the position line 300 for the thin concrete slab, as shown in fig. 10; drilling 400 in a circular matrix along the location line 300 for the thicker concrete slab and cutting the holes 400 into openings within the location line 300, as shown in FIG. 11; and (3) removing the redundant concrete 107 on the inner side of the hole by using a hand hammer and a drill rod, removing the concrete 107 in the hole, and burying the pile casing 101 downwards in the hole. The purpose of drilling and cutting the concrete layer plate to form the opening is to remove the concrete layer plate at the corresponding position of the position line, so as to embed the pile casing 101 and construct the pile hole 204. Drilling holes in a circular matrix and cutting holes 400 in the position lines 300 are suitable for the construction of concrete slabs of any thickness.

Referring to fig. 7 and 9, an embodiment of the present invention provides a bored pile, including a pile hole 204 sequentially penetrating an upper soil layer 201, a confined water layer 202, and a lower soil layer 203 below a ground plane 200, and a reinforced concrete column formed by a reinforcement cage 105 and concrete 107 for replacing a large-gravity slurry 104 for resisting upward gushing of the confined water layer 202 is disposed in the pile hole 204.

The embodiment of the utility model provides a bored concrete pile, bored concrete pile sets up below the bottom floor of existing basement. Namely the utility model discloses bored concrete pile can be applicable to the maintenance of the vertical braces system of existing basement, the existing transformation engineering to existing basement such as adding the layer.

The embodiment of the utility model provides a bored concrete pile, bored concrete pile sets up below the foundation ditch of newly-built basement. That is, the embodiment of the present invention can be applied to a new construction of a building or a structure.

The embodiment of the utility model provides a bored concrete pile and construction method thereof is upwards gushed with the groundwater that resists in the confined water layer through injecting big proportion mud 104 in stake hole 204 to bored concrete pile is under construction through penetrating confined water layer 202. The large-specific gravity mud 104 not only suppresses the groundwater gushing caused by the confined water layer 202, but also can ensure the stability of the hole wall of the pile hole 204 and prevent the pile hole 204 from collapsing, thereby reducing the construction difficulty of the cast-in-situ bored pile. The embodiment of the utility model provides a bored concrete pile is located upper soil body layer 201, confined water layer 202 and lower soil body layer 203 below the horizon 200, can be under construction at the soil body environment that has confined water layer 202. The embodiment of the utility model provides a bored concrete pile for the reinforced concrete 107 pile body that the concrete 107 and the steel reinforcement cage 105 of the big proportion mud 104 of replacement constitute has improved the bored concrete pile steadiness.

The present invention is not limited to the above embodiments, and any modifications and modifications made by those skilled in the art according to the above embodiments are within the scope of the claims.

Claims

1. A cast-in-situ bored pile is characterized by comprising a pile hole which sequentially penetrates through an upper soil layer, a pressure-bearing water layer and a lower soil layer below a ground level, wherein a steel reinforcement cage and a reinforced concrete column which is used for replacing concrete of large-proportion mud for resisting upward gushing of the pressure-bearing water layer are arranged in the pile hole.

2. The bored pile of claim 1, wherein the bored pile is disposed below a floor slab of an existing basement.

3. The cast-in-situ pile as recited in claim 1, wherein the cast-in-situ pile is disposed below a foundation pit of a newly-built basement.