TW201741529A - Method for constructing advanced pavement for preventing construction site collapse before construction of diaphragm wall in which support piles are first established and grid beams are welded to tops of the piles for supporting grouting and forming of a concrete pavement thereon - Google Patents

Abstract

A method for constructing advanced pavement for preventing a construction site collapse before construction of a diaphragm wall is generally applicable to construction of concrete pavement on a construction foundation of soft earth to form a safety floor for construction. The prevent invention generally includes first driving support piles for excavating ground before construction of a diaphragm wall and using the support piles as a vertical support for advanced construction of concrete pavement on the construction base so as to form a floor having capability of supporting on a ground surface of an earth base that is originally weak. Steps of construction according to the present invention include: applying and establishing support piles, welding and fixing steel plates to tops of the support piles, constructing grid beams and/or reinforced steel bar network between tops of adjacent ones of the support piles, constructing a pavement steel bar network, and grouting concrete to form a safe construction concrete pavement to form a floor that is capable of preventing collapse of construction site. The concrete pavement may serve as improved floor for the base. In subsequent construction of a diaphragm wall, there is no need to apply overall earth modification and making earth modification at the site of an edge of a gutter alone is sufficient to prevent collapse of the gutter and an excavation trough so as to obtain good quality of diaphragm wall construction.

Description

Construction method for preventing premature pavement of workers before underground wall construction

The invention relates to a construction method for preventing premature sag of a working face before continuous wall construction, which mainly solves the problem that the soil is weak, the soil has liquefaction, and the soil containing high water content is applied in the continuous wall project to prevent formation subsidence and continuous wall excavation. The problem with the slot side.

Nowadays, the foundation of the continuous wall of the continuous wall is deeper and deeper, so there are supporting designs such as buttress and transverse partition. Such continuous wall construction with buttress and transverse partition design will cause the construction base to be cut into several small bodies, destroying the integrity of the original construction floor and causing the construction environment of the weak formation.

Soil liquefaction also causes the formation to sink. Originally a pond, a puddle, and then backfilled into the ground, due to high water content. When heavy machinery is stationed in such a construction base, it will also cause the floor to sink and groundwater seep out of the surface.

For the continuous wall construction in the weak construction base, the pile diameter construction must be carried out at the side of the guide groove to carry out the floor reconstruction to avoid the guide groove or/and the excavation groove. In addition, since the stratum of the construction base is weak and geological, it is necessary to do comprehensive geological improvement and reinforcement projects before construction, increase construction costs, and increase the difficulty in excavation in the future. If the geological improvement and strengthening project of the construction unit is not correct, it will easily cause the formation to sink after the heavy machinery enters the base, and even the continuous wall excavation tank will be in an awkward situation.

When the grounding subsidence occurs in the construction base, it is easy to damage the adjacent building and increase the follow-up Legal and compensation events. When the ground subsides, if a staff member is working on the construction site or operating the machine, there will be an incident of injury or death. The back side of the continuous wall excavation tank must be backfilled and further geological improvement is required to re-excavate, which not only increases the working hours but also the quality of the continuous wall construction. How to avoid the floor subsidence and improve the quality of continuous wall construction in a soft and geological construction base with safe and reliable construction methods is the industry's demand.

In order to solve the problem of continuous wall construction of the soft formation mentioned above, the applicant provides a construction method for preventing the underground pavement of the construction site before the continuous wall construction, so as to improve the floor strength of the construction base and avoid the problem of the floor slab.

The construction method for preventing the underground pavement before the continuous wall construction provided by the invention can further strengthen the strength of the guide groove, so as to reduce the number of pile diameter construction of the guide groove, thereby reducing the construction period and reducing the construction cost.

The construction method for preventing the underground pavement of the underground subsidence before the continuous wall construction provided by the invention mainly applies the support pile for ground excavation before the continuous wall is applied, and uses the support pile as the vertical load of the concrete pavement of the construction base Support, and the surface of the original weak formation base forms the floor of the torch carrying capacity. When it is applied as a continuous wall project, it is only necessary to make a key change in the guide groove to prevent the groove and the excavation groove from collapsing, so as to obtain a good quality continuous wall project.

Before the construction of the invention, the construction stakeout is confirmed on the construction base, the design of the continuous wall is applied, and the position and quantity of the support piles. The construction steps include: applying the support pile, the pile top welded steel plate of the support pile, applying the lattice beam or/and reinforcing the steel mesh between the pile top and the pile top of the adjacent support pile, pouring the concrete to form the pavement, and completing the Concrete pavement. The concrete pavement is the base change The floor of the aftermath.

A lattice beam or/and a reinforcing mesh is applied between the pile top of the adjacent support pile and the top of the pile to form an internal structure of the pavement. The steel plate at the top of the supporting pile and the top of the pile is the overlapping surface and bearing point of the lattice beam/reinforced mesh. Then the support piles are the vertical bearing support of the concrete pavement.

The steel plate on the support pile may be a square plate of one square square or a circular plate of one meter diameter.

The thickness of the pavement is determined by the height of the lattice beam between the pile tops of the adjacent support piles and the reinforcing mesh, and the bearing capacity of the pavement is determined.

10‧‧‧Continuous wall location

11‧‧‧Bottom position

20‧‧‧Support pile

21‧‧‧ steel plate

22‧‧‧ lattice beam

23‧‧‧ steel mesh

30‧‧‧ soil

40‧‧ ‧ pavement

41‧‧‧Pavement mesh

Step a‧‧‧ hitting support pile

Step b‧‧‧ Welded steel plate at the top of the pile

Step c‧‧‧Segmented lattice beams or/and reinforcing bars on adjacent support piles

Step d‧‧‧ applied as a pavement mesh

Step e‧‧‧casting concrete to form a pavement

Step f‧‧‧Complete concrete paving

Figure 1 shows the construction process of the construction method of the present invention.

Figure 2 shows the design of the continuous wall and the design of the support pile design.

Figure 3 is a cross-sectional view of the support pile driven into the soil of the base.

Figure 4 shows the appearance of the support pile into the soil of the base.

Figure 5 is an external view of the pile top welded steel plate of the supporting pile.

Figure 6 is a longitudinal sectional view of the pile top welded steel plate of the supporting pile

Figure 7 is a schematic view of the pile top lattice beam and the reinforcing steel reinforcement of the support pile.

Figure 8 is a longitudinal cross-sectional view of the pile top lattice beam of the support pile.

Figure 9 is a cross-sectional view of a concrete pavement.

In the continuous wall construction, the bases that are prone to land subsidence are mostly in areas with weak formations, or because the terrain of the base is too small or too narrow, causing the heavy machine to be too concentrated. Caused a partial subsidence of the floor. For bases that are prone to land subsidence, a comprehensive reform must be done to increase the strength of the formation. The applicant's decision to do a comprehensive reform of the base will extend the construction period and increase the cost. It is a method for constructing a prefabricated pavement to prevent underground subsidence before continuous wall construction.

The main idea of the construction method of the present invention is to lay a pavement with high load carrying capacity on the base first, and to carry heavy equipment and strengthen the strength of the guide groove by virtue of the pavement.

When the stratum of the construction base is weak soil, if the pavement is directly laid on the ground, the pavement will be broken due to the subsidence of the stratum, and it is impossible to achieve the purpose of carrying the implements and preventing the subsidence of the ground. However, the traditional continuous wall construction will be grounded in the base after the continuous wall construction is completed. Before the ground excavation, a large number of supporting piles should be placed in the base to support the continuous wall before the ground excavation works can be carried out. In the invention, the support piles are advanced in advance as the bottom bearing support of the pavement.

Please refer to Figure 1 and Figure 2. Before the construction of the invention, the construction site is confirmed to be staked out on the construction base, and the continuous wall is applied to the position 10 design, including the position design of the buttress 11 and the position and number of the support pile 20. Construction steps of the invention:

a. Strike support pile 20:

Each support pile 20 is driven into the soil 30 of the base, as shown in FIG. 3 and FIG. The pile top height of each of the support piles 20 is the lower elevation of the concrete pavement 40 (see Fig. 9).

b. The top of the support pile 20 is welded to the steel plate 21:

The pile top welded steel plate 21 of each of the support piles 20 is as shown in FIG. 5 and FIG. The steel plate 21 may be a square plate of one meter square or a circular plate of one meter diameter. The size of the steel sheet 21 can be appropriately changed depending on the construction needs.

c. Applying a lattice beam 22 or/and a reinforcing mesh 23 between the pile tops of adjacent support piles 20:

A lattice beam 22 or/and a reinforcing mesh 23 are applied between the pile tops of adjacent support piles 20 to form part of the internal structure of the pavement, as shown in FIGS. 7 and 8. The steel plate 21 at the top of the support pile 20 can be used as a lap joint of the lattice beam 22 and the reinforcing steel mesh 23 to improve the structural strength of the pavement. The thickness of the concrete deck 40 can also be determined by the height of the lattice beam 22 between the pile tops of the adjacent support piles 20 and the height of the reinforcing mesh 23 to improve the load carrying capacity of the concrete deck 40.

d. Application of paving reinforcement mesh 41:

The pavement reinforcement mesh 41 of the original design is applied above the lattice beam 22 or/and the reinforcing steel mesh 23 between the pile tops of the respective support piles 20.

e. Pouring concrete to form pavement 40:

Concrete is poured into the construction base to cover each of the support piles 20, the lattice beams 22, the reinforcing steel mesh 23, and the original design of the pavement reinforcement mesh 41 to form a concrete pavement 40.

f. Complete the concrete pavement:

The concrete pavement 40 is the improved floor.

The pavement 40 which is completed by the present invention is vertically supported by each support pile 20. The support piles 20 are support structures for the ground to open and excavate, and the support strength design thereof has been considered to maintain the support strength with sufficient safety factor after the underground layer is completely excavated. The concrete pavement 40 completed by the present invention not only has the safety support coefficient originally designed by the support pile 20, but also increases the friction support of the soil 30 to the support pile 20 because the ground is in an unexcavated state. Therefore, the vertical support strength of the concrete pavement 40 has a high safety factor.

The concrete pavement 40 which is completed by the present invention has high load carrying capacity and is sufficient to carry the weight of the heavy machine so that the base floor (concrete paving) does not collapse due to the weight of the implement. That is, the base floor will maintain its strength.

Originally applied to the continuous wall project in the weak stratum, in order to prevent the guide groove from collapsing, it is necessary to apply the ground to the pile at several locations along the guide groove. In the construction base where the concrete pavement 40 is laid by the method of the present invention, since the floor does not collapse, the probability of the guide groove naturally collapsing is naturally greatly reduced. Therefore, the operator only needs to make a partial change (applied to the ground) in the collapse of the guide groove (such as the corner), which naturally reduces the construction period of the continuous wall and reduces the construction cost.

After laying the concrete pavement 40 first by using the method of the present invention, the following advantages are obtained:

1. The concrete pavement 40 can carry heavy machinery so that the floor does not sag or collapse due to the weight of the implement.

2. It is not used for comprehensive reform, which can save the construction period and construction cost of comprehensively reformed.

3. It can reduce the number of side-strained piles in continuous wall guide ditch, which can reduce construction cost and shorten construction period.

4. It can reduce the situation of floor subsidence and continuous wall guide ditch, which can reduce the incidents that damage the neighbors.

5. Since the floor subsidence and the continuous wall guide groove are not easy to occur, the construction quality of the continuous wall can be improved, and the quality of the building can be ensured.

6. During the construction process, the construction site is not prone to sag and squatting, which helps the neighbors and neighbors, and at the same time enhances the corporate image.

In summary, the present invention selects the support pile 20 before the continuous wall is applied, which is an unprecedented construction thinking. The present invention utilizes the support pile 20 as a vertical load-bearing support for the concrete pavement 40, and also has a structure different from the conventional pavement, and is also a more reliable pavement 40 for vertical support. Therefore, by using the concrete pavement 40 applied by the method of the present invention as a base floor, the base of the weak formation can also obtain a good quality continuous wall project in a safe and reliable construction process.

Although the present invention has been disclosed above in the embodiments, it is not intended to limit the present invention. It is to be understood that any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the invention, and the scope of the invention is defined by the scope of the patent application.

Step a‧‧‧ hitting support pile

Step b‧‧‧ Welded steel plate at the top of the pile

Step c‧‧‧ Applying lattice beams or/and reinforcing meshes between the pile tops of adjacent support piles

Step d‧‧‧ applied as a pavement mesh

Step e‧‧‧casting concrete to form a pavement

Step f‧‧‧ Complete the concrete pavement

Claims (4)

A construction method for preventing premature sag of a building before continuous wall construction, which is to confirm the position of the building site, the design of the continuous wall, and the position and quantity of the supporting pile before the construction; the construction steps are: a. Support pile: the support piles are driven into the soil of the base; the pile top height of each support pile is the lower elevation of the concrete pavement; b. The pile top welded steel plate of the support pile: the pile top of each support pile All welded steel plates; c. Lattice beams or/and reinforced meshes are placed between the pile tops of adjacent support piles: lattice beams or/and reinforcing meshes are applied between the pile tops of adjacent support piles to form a part of the internal structure of the pavement; the steel plate at the top of the support pile is the lattice joint of the lattice beam and the reinforcing steel; d. the pavement reinforcement mesh is applied: the lattice beam is applied between the tops of the aforementioned support piles or / And reinforcing the upper part of the steel mesh, applying the original design of the pavement reinforcement mesh; e. pouring the concrete to form the pavement: pouring concrete in the construction base to cover the support piles, the lattice beam and the steel mesh to form a concrete pavement; f. completing the mixing Condensate Pavement: The concrete pavement is the floor after improvement. For example, in the prior art, the method for constructing the pre-construction method for preventing the underground subsidence before the continuous wall construction according to the first aspect of the patent application, the steel plate in the step b is a square plate of one square square. For the prior paving construction method for preventing underground subsidence before continuous wall construction as described in the first paragraph of the patent application, the steel plate in the step b is a circular plate having a diameter of one meter. For the first paving construction method for preventing underground subsidence before continuous wall construction as described in the first aspect of the patent application, in step c, by means of the lattice beam between the pile tops of adjacent supporting piles and the height of the reinforcing mesh, Determine the thickness of the pavement and determine the carrying capacity of the pavement.