CN105256811B - Construction method for foundation pit supporting and protecting through sheet pile supporting structure with water stopping function - Google Patents

Abstract

The invention discloses a sheet pile support structure with water-stop function and a construction method, which is used for retaining soil and water-stop on the surrounding wall of a foundation pit, and comprises sheet piles arranged at intervals along the positioning line of foundation pit support, and the sheet piles There are grooves on both sides, and a concrete strap for retaining soil and water is provided between the grooves of adjacent sheet piles, and the two ends of the concrete strap are embedded in the groove, and the two ends of the concrete strap are connected to the groove There is a rubber waterstop for waterproofing. The invention adopts assembled construction, which is convenient and quick. The concrete board plays the role of retaining soil and water, and the rubber waterstop plays a role of waterproof sealing. It improves the integrity of the support structure, effectively improves the rigidity of the support structure, and finally realizes the safety and stability of the foundation pit project, especially suitable for relatively regular small and medium-sized foundation pit projects.

Description

Construction method of sheet pile support structure with water-stop function for foundation pit support

technical field

The invention relates to the technical field of construction engineering, in particular to a construction method for foundation pit support of a sheet pile support structure with a water-stop function.

Background technique

In recent years, with the rise of high-rise buildings, the scale of foundation pit engineering has also become larger and larger. At the same time, with the rapid development of underground transportation and the continuous construction of underground shopping malls and municipal facilities, simple grading and excavation can no longer meet the engineering reality, and various forms of enclosure structures have followed. The core issue in the foundation pit engineering is the rational design of the enclosure system. The system should not only play the role of retaining soil, but also prevent water and soil loss outside the foundation pit, so that the ground settlement and horizontal displacement around the foundation pit can be controlled within the allowable range. At present, prefabricated sheet piles are mostly used for foundation pit support in projects. Due to the soil and water retaining effect of the support structure, the pile spacing is small, the amount of material used is large, and the lifting capacity of a single hoisting is relatively heavy. High standard.

Contents of the invention

The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, to provide a sheet pile support structure and construction method that can make full use of the support stiffness, enhance the stability of the foundation pit, have a good waterproof effect and have a water-stop function .

The technical solution adopted by the present invention to solve the technical problem is: a sheet pile support structure with water-stop function, which is used for retaining soil and water-stop on the surrounding wall of the foundation pit, including sheet piles arranged at intervals along the positioning line of the foundation pit support , the two sides of the sheet piles have grooves, and a concrete strapping board for retaining soil and water is provided between the grooves of adjacent sheet piles, and the two ends of the concrete strapping boards are embedded in the grooves, and the concrete strapping boards There are rubber waterstops for waterproofing at the connection between both ends and the groove.

Preferably, the grooves are in the shape of square strips.

Preferably, the depth of the sheet pile extending into the soil layer at the bottom of the foundation pit is 50% to 80% of the depth of the foundation pit.

The depth of the rubber waterstop extending into the soil layer at the bottom of the foundation pit is 10% of the depth of the foundation pit.

A construction method for foundation pit support using the above-mentioned sheet pile support structure with water-stop function has the following steps:

a. Prefabricate or purchase sheet piles and concrete slabs according to the design parameters of foundation pit support;

b. Embed a rubber waterstop in the groove of the sheet pile;

c. Along the positioning line of foundation pit support, three-axis stirring piles are used to form grooves;

d. Position through the guide groove and insert sheet piles in sequence;

e. Align the groove position of the sheet pile and insert the concrete lapping board;

f. Repeat the above b-e steps to continuously connect the sheet piles and the concrete slabs together to form a sheet pile support structure with water-stop function.

The beneficial effects of the present invention are: the present invention adopts assembly construction, which is convenient and quick, and has strong engineering practicability. Increase the spacing between sheet piles, make full use of the rigidity of the support structure, ensure the integrity of the support structure, and effectively improve the safety and stability of the foundation pit project, especially suitable for relatively regular small and medium-sized foundation pit projects.

Description of drawings

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

Fig. 1 is the construction facade structure schematic diagram of the present invention.

Fig. 2 is a schematic plan view of the present invention.

In the figure 1. Sheet pile 2. Groove 3. Concrete board 4. Rubber waterstop 5. Foundation pit

detailed description

The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

As shown in Figure 1 and Figure 2, a sheet pile support structure with water-stopping function is used for retaining and water-stopping the 5 surrounding walls of the foundation pit with an effective depth less than or equal to 10m, including the distance along the 5 support positioning lines of the foundation pit Arranged sheet piles 1, both sides of the sheet piles 1 have square strip-shaped grooves 2, and between the grooves 2 of adjacent sheet piles 1, a concrete lap 3 for retaining soil and water is provided, The two ends of the concrete board 3 are embedded in the groove 2, and a rubber waterstop 4 for waterproofing is provided at the connection between the two ends of the concrete board 3 and the groove 2.

Wherein the depth of sheet pile 1 extending into the bottom soil layer of foundation pit 5 is 80% of the depth of foundation pit 5;

A construction method for implementing foundation pit support by adopting the above-mentioned sheet pile support structure with water-stopping function has the following steps:

a. According to the support design parameters of foundation pit 5, prefabricate or purchase sheet pile 1 and concrete lap slab 3;

b. Embed rubber waterstop 4 along the inner peripheral wall of groove 2 of sheet pile 1;

c. Along the 5 support positioning lines of the foundation pit, three-axis stirring piles are used to form grooves;

d. Position through the guide groove, insert sheet piles 1 in sequence, and the grooves 2 of adjacent sheet piles 1 are opposite to each other;

e. Align the position of the groove 2 of the sheet pile 1, insert the concrete strap 3, and the top surface and both sides of the concrete strap 3 are closely attached to the rubber waterstop 4 respectively;

f. Repeat steps b to e above to continuously connect the sheet pile 1 and the concrete lap 3 to form a sheet pile support structure with a water-stop function.

In this embodiment, the sheet pile 1 is made of reinforced concrete, the depth of the foundation pit 5 is 10m, the depth of the sheet pile 1 extending into the bottom soil layer of the foundation pit 5 is 8m, and the depth of the rubber waterstop 4 extending into the bottom soil layer of the foundation pit 5 1m.

The present invention adopts prefabricated construction, which is convenient and fast. The concrete board 3 plays the role of retaining soil and water, and the rubber waterstop 4 plays the role of waterproof sealing, and the distance between the sheet piles 1 can be appropriately increased, so that the foundation pit 5 The support form is extended from the conventional plane mode to the space mode, which strengthens the integrity of the support structure, effectively improves the stiffness of the support structure, and makes full use of the stiffness of the support structure to ensure the integrity of the support structure and effectively improve the foundation structure. The safety and stability of the pit 5 project is especially suitable for relatively regular small and medium-sized foundation pit 5 projects.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention. Substantial equivalent changes or modifications shall fall within the protection scope of the present invention.

Claims (4)

1. a kind of sheet pile supporting construction with water stopping function carries out the construction method of pattern foundation pit supporting structure, described sheet pile supporting construction Including along the spaced sheet pile (1) of foundation ditch (5) supporting position line, described sheet pile (1) two sides are respectively provided with groove (2), phase The concrete attachment strap (3) for keeping off native sealing is provided between the groove (2) of adjacent sheet pile (1), the two ends of concrete attachment strap (3) are embedded in the groove (2) in, concrete attachment strap (3) two ends are provided with the rubber fastening band (4) for waterproof with groove (2) junction；

Described construction method has following steps：

A, according to foundation ditch (5) support parameters, it is prefabricated or purchase sheet pile (1), concrete attachment strap (3)；

B, the groove (2) in sheet pile (1) are embedded in rubber fastening band (4)；

C, along foundation ditch (5) supporting position line, using three axes agitating pile grooving；

D, by guide groove position, be sequentially inserted into sheet pile (1)；

Groove (2) position of e, alignment sheet pile (1), insertion concrete attachment strap (3)；

F, the above-mentioned b～step e of repetition, sheet pile (1) is constantly linked together with concrete attachment strap (3), encloses to be formed with sealing work( The sheet pile supporting construction of energy.

2. the sheet pile supporting construction with water stopping function according to claim 1 carries out the construction method of pattern foundation pit supporting structure, its It is characterized in that：Described groove (2) is square ribbon.

3. the sheet pile supporting construction with water stopping function according to claim 1 carries out the construction method of pattern foundation pit supporting structure, its It is characterized in that：Described sheet pile (1) stretches into 50%～80% that foundation ditch (5) bottom solum depth is foundation ditch (5) depth.

4. the sheet pile supporting construction with water stopping function according to claim 3 carries out the construction method of pattern foundation pit supporting structure, its It is characterized in that：Described rubber fastening band (4) stretches into 10% that foundation ditch (5) bottom solum depth is foundation ditch (5) depth.