TWI623669B - Construction method of advance pavement for preventing underground subsidence before continuous wall construction - Google Patents

Abstract

The utility model relates to a construction method for preventing the ground from subsiding before continuous wall construction, which is mainly applied to the construction of concrete on a weak construction base to form a safe construction floor. The main continuous wall of the invention is used to excavate support piles for ground excavation first, and use the support piles as a vertical load-bearing support for the concrete pavement of the construction base, and form a torch-bearing capacity floor on the ground of the original weak stratum base. . The construction steps of the present invention include: hitting a supporting pile, welding a steel plate on the pile top of the supporting pile, applying a lattice beam or / and reinforcing steel mesh between the pile top and the pile top of an adjacent supporting pile, applying a pavement reinforcing steel mesh, The concrete is poured to form a safe construction concrete pavement, and a ground floor capable of preventing the work from subsiding is completed. The concrete paving is the improved floor of the base. In the subsequent construction of the continuous wall project, it is not necessary to implement a comprehensive change in a comprehensive manner. Only a major change in the side of the guide trench is required to prevent the trench and the trench from collapsing, so as to obtain a good quality Continuous wall works.

Description

Construction method of advance pavement for preventing underground subsidence before continuous wall construction

The invention relates to a construction method of a prior pavement for preventing underground subsidence before construction of a continuous wall, which mainly solves the problem of weak soil, soil liquefaction, and a high water content in the base. The construction of the continuous wall prevents the formation from subsidence and continuous wall excavation Slot collapse problem.

Nowadays, the foundation of continuous wall and continuous wall is getting deeper and deeper, so there are supporting designs such as buttresses and transverse partitions. This type of continuous wall construction with supporting walls and horizontal partitions will cause the construction base to be cut into several small bodies, destroy the integrity of the original construction floor, and cause a weak stratum construction environment.

Soil liquefaction can also cause formation subsidence. The original layer was a pond or puddle, which was then backfilled into the ground because of its high water content. When heavy machinery enters such construction bases, the ground subsidence will also cause groundwater to seep out of the ground.

For continuous wall construction at a weak construction base, pile diameter construction must be done next to the guide trench, and floor reconstruction should be performed to avoid collapse of the guide trench or excavation trench during excavation. In addition, because the stratum of the construction base is weak geology, comprehensive geological improvement and strengthening projects must be done before construction, which increases construction costs and also increases difficulty in future excavations. If the geological improvement and strengthening works of the construction unit are not accurate, the heavy-duty equipment will easily cause the ground to collapse after entering the base, or even cause the continuous wall excavation trough to collapse.

When floor subsidence occurs at the construction base, it is easy to damage neighboring buildings and increase follow-up Legal and compensation incidents. When the floor subsides, if a worker is working on the site or operating a machine, a work safety incident that will cause injury or death will occur. The slump of a continuous wall excavation trough must be backfilled and geologically improved before re-digging, which not only increases man-hours but also affects the quality of continuous wall construction. How to avoid floor subsidence and improve the quality of continuous wall construction in a safe and reliable construction method on a weak geological construction base is what the industry seeks.

In order to solve the problem of continuous wall construction of the aforementioned soft ground, the applicant provided a construction method for preventing the ground from subsiding before continuous wall construction, so as to improve the strength of the construction base and avoid the problem of ground collapse.

The construction method of the prior pavement for preventing wall subsidence before construction of the continuous wall provided by the present invention can further strengthen the guide trench strength, reduce the number of pile diameter constructions for the guide trench, reduce the construction period, and reduce construction costs.

The construction method of the prior pavement for preventing the subsidence of the ground before construction of the continuous wall provided by the present invention is mainly to apply a support pile for ground excavation before the continuous wall is applied, and use the support pile as a vertical bearing for the concrete pavement of the construction base. Support, and a torch bearing floor is formed on the ground of the original weak stratum base. Then, when the continuous wall project is implemented, only a major modification is required at the side of the guide trench to prevent the trench and the excavation trench from collapsing, so as to obtain a continuous wall project of good quality.

Before construction, the present invention confirms the setting out of the building on the construction base, the design of the continuous wall construction, and the position and number of support piles. The construction steps include: hitting a supporting pile, welding a steel plate on the pile top of the supporting pile, applying a lattice beam or / and reinforcing steel mesh between the pile top and the pile top of an adjacent supporting pile, pouring concrete to form a pavement, and completing the Concrete paving. The concrete paving is the base modification After the floor.

A lattice beam or / and a reinforcing steel mesh is applied between the pile tops of the aforementioned adjacent support piles and the pile tops to form the internal structure of the pavement. The steel plate on the top of the supporting pile and the top of the pile is the overlap surface and bearing point of the lattice beam and / or reinforcing steel mesh. Each supporting pile is a vertical bearing support of the concrete paving.

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

The thickness of the pavement and the bearing capacity of the pavement are determined by the height of the lattice beam between the tops of the adjacent supporting piles and the reinforcing steel mesh.

10‧‧‧ continuous wall position

11‧‧‧ Fubi position

20‧‧‧ support pile

21‧‧‧ steel plate

22‧‧‧ lattice beam

23‧‧‧ Reinforced Mesh

30‧‧‧ Soil

40‧‧‧ Shop Noodles

41‧‧‧ Pavement reinforced mesh

Step a‧‧‧ hit the support pile

Step b‧‧‧ Welding steel plate at the top of the supporting pile

Step c‧‧‧ at the top of the pile on the adjacent supporting pile or / and reinforcing steel

Step d‧‧‧ Apply the pavement reinforcement mesh

Step e‧‧‧ Pouring concrete to form a pavement

Step f‧‧‧ Finish the concrete paving

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

Figure 2 is the engineering drawing of continuous wall construction design and support pile design.

Figure 3 is a sectional view of the supporting pile driving into the soil of the base.

Figure 4 shows the appearance of the supporting pile driving into the soil of the base.

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

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

Fig. 7 is a schematic diagram of a pile top lattice beam and a reinforcing steel bar of a supporting pile.

Fig. 8 is a longitudinal sectional view of a lattice beam at the top of a pile.

Figure 9 is a sectional view of a concrete pavement.

During continuous wall construction, bases that are prone to subsidence are mostly in areas with weak strata, or because the terrain of the base is too small or too narrow, causing heavy machinery to be concentrated. Cause local subsidence of the floor. For bases that are prone to subsidence, a complete overhaul must be done to improve stratum strength. The applicant is due to the comprehensive renovation of the base, which will prolong the construction period and increase the cost. It is the research and development of a prefabricated pavement construction method to prevent the underground subsidence before the continuous wall construction.

The main idea of the construction method of the present invention is to first lay a pavement with a high bearing capacity on the base, rely on the pavement to carry heavy machinery, and strengthen the strength of the guide channel.

When the stratum of the construction base is weak soil, if the pavement is directly laid on the ground, the pavement will rupture due to the subsidence of the stratum, which cannot achieve the purpose of carrying equipment and preventing the subsidence of the ground. However, the traditional continuous wall construction will excavate the ground in the base after the continuous wall construction is completed. Before excavating the ground, a plurality of supporting piles must be placed in the base to support the continuous wall before the ground excavation can be carried out. In the present invention, the advance construction of each supporting pile is used as the bottom bearing support of the pavement.

Please refer to Figure 1 and Figure 2. Prior to the construction of the invention, the location of the building is to be staked out on the construction base, and the design of the position 10 of the continuous wall includes the design of the position of the supporting wall 11 and the position and quantity of the supporting pile 20. Construction steps of the present invention:

a. Hitting the supporting pile 20:

Each support pile 20 is driven into the soil 30 of the base, as shown in FIGS. 3 and 4. The pile top height of each support pile 20 is the lower elevation of the concrete paving 40 (see FIG. 9).

b. Welded steel plate 21 on the top of the support pile 20:

A steel plate 21 is welded to the pile top of each supporting pile 20 as shown in FIGS. 5 and 6. The steel plate 21 may be a square plate with a square of one meter, or a circular plate with a diameter of one meter. The size of the steel plate 21 can be appropriately changed according to construction requirements.

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

A lattice beam 22 or / and a reinforcing steel mesh 23 are applied between the pile tops of the adjacent support piles 20 to form a 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 the overlapping surface of the lattice beam 22 and the reinforcing steel mesh 23 to improve the structural strength of the paving. The thickness of the concrete paving 40 can also be determined by the height of the lattice beam 22 and the reinforcing steel mesh 23 between the tops of the adjacent supporting piles 20 to improve the bearing capacity of the concrete paving 40.

d. Application of pavement reinforced mesh 41:

Above the lattice beams 22 or / and the reinforced reinforcing meshes 23 provided between the tops of the aforementioned supporting piles 20, a pavement reinforcing mesh 41 of the original design is applied.

e. Pouring concrete to form a pavement 40:

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

f. Finish the concrete paving:

The concrete paving 40 is an improved floor.

The pavement 40 completed by the present invention is vertically supported by each supporting pile 20. The support piles 20 are support structures that are excavated along the ground. The support strength design has taken into account that the support strength can still be maintained with sufficient safety coefficient after the underground layer is fully excavated. In addition to the safety support factor originally designed for the support pile 20, the concrete paving 40 completed by the present invention increases the frictional support of the soil pile 30 to the support pile 20 because the ground is not excavated. Therefore, the vertical support strength of the concrete paving 40 has a high safety factor.

The completed concrete paving 40 of the present invention has a high bearing capacity, which is sufficient to bear the weight of heavy machinery, so that the base floor (concrete paving) will not collapse due to the weight of the machinery. That is, the base floor will maintain strength.

The continuous wall project was originally constructed in weak strata. In order to prevent the diversion trench from collapsing, it is necessary to carry out ground modification piles at multiple sides of the diversion trench. At the construction base where the concrete paving 40 is laid using the method of the present invention, since the floor will not slump, the probability of the guide ditch naturally collapsing is greatly reduced. Therefore, the operator only needs to make local modification (construction of piles) on the side of the guide trench that is prone to collapse (such as corners), naturally reducing the construction period of the continuous wall and reducing the construction cost.

After the concrete pavement 40 is laid in advance using the method of the present invention, it has the following advantages:

1. The concrete paving 40 can carry heavy machinery, so that the floor will not sag or collapse due to the weight of the machinery.

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

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

4. It can reduce the ground subsidence and the collapse of continuous wall guide ditch, and it can reduce the event of damage to the neighbor.

5. As the floor subsidence and the collapse of the continuous wall guide ditch are not easy to occur, the construction quality of the continuous wall can be improved and the quality of the building can be guaranteed.

6. During the construction process, it is not easy for the construction site to sag and collapse, which can help the neighbors and neighbors, and at the same time enhance the corporate image.

In summary, the present invention chooses to apply the support pile 20 before the continuous wall is applied, which is a construction thought that has never been seen before. The invention uses the supporting pile 20 as a vertical bearing support of the concrete paving 40, which is also different from the traditional paving structure, and is also a paving 40 with more reliable vertical support. Therefore, by virtue of the concrete paving 40 made by the method of the present invention as the floor of the base, the base of the weak stratum can also obtain a continuous wall project of good quality in a safe and reliable construction process.

Although the present invention is disclosed as above in the embodiments, it is not intended to limit the present invention. It is clear that anyone skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the patent application.

Claims (4)

A construction method for preventing pavement from falling before construction of a continuous wall. Before construction, confirm the location of the building on the construction base, stake out the design of the continuous wall, and the position and number of support piles. Its characteristics are as follows: The construction steps are as follows: a. Driving support piles: driving each support pile into the soil of the base; the height of the top of each support pile is the lower elevation of the concrete pavement; b. welding the steel plate at the top of the support pile: the support The pile tops of the piles are welded with steel plates; c. The lattice beams and / or reinforced meshes are applied between the pile tops of adjacent supporting piles: the lattice beams and / or reinforcements are applied between the pile tops of adjacent support piles. Net to form part of the internal structure of the pavement; the steel plate at the top of the support pile is the overlapping surface of the lattice beam and reinforced steel; d. The pavement reinforced mesh: applied between the tops of the aforementioned support piles Above the lattice beam or / and reinforced reinforcement mesh, the original design of the pavement reinforcement mesh; e. Pouring concrete to form the pavement: pouring concrete in the construction base to cover each supporting pile, lattice beam, and reinforcing mesh to form a concrete pavement; . Into the concrete pavement: the floor after the concrete pavement shall be improved. According to the prior paving construction method for preventing wall subsidence before continuous wall construction as described in item 1 of the scope of the patent application, the steel plate in step b is a square meter square. According to the prior paving construction method for preventing continuous subsidence before continuous wall construction described in item 1 of the scope of patent application, the steel plate in step b is a circular plate with a diameter of one meter. According to the prior pavement construction method for preventing the subsidence of the construction site before the continuous wall construction described in item 1 of the scope of the patent application, in step c, relying on the height of the lattice beam between the pile tops of the adjacent supporting piles and the reinforcement steel mesh Decide on the thickness of the pavement and the bearing capacity of the pavement.