JPH0339129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for sequentially sinking a large number of caissons installed in series on the ground.

[Prior art]

Generally, when sinking a caisson, both the left and right sides of the front part of the caisson and the left and right sides of the rear part of the caisson are
Insert and lock the lower part of the anchor member into the ground, and erect pressure girders that extend in the left and right directions on both the front and rear sides of the caisson, and use jacks such as center hole jacks that are fixed to each anchor member to tighten the pressure girders. The caisson is pushed down and sunk. However, when sinking a large number of caissons installed in series on the ground, if the above-mentioned conventional method is adopted, it is necessary to install four times as many anchor members as the number of caissons, which takes a long time and is costly. The problem is that it costs a lot of money.

[Purpose and structure of the invention]

The purpose of this invention is to provide a method for sinking a continuous caisson that can advantageously solve the above-mentioned problems, and the gist of this invention is to:
A large number of caissons are lined up in the front-rear direction and installed on the ground, and anchor members are anchored to the ground 2 on both left and right sides of the rear end of the first caisson 1A located at the rear end and on both left and right sides of the front end of each caisson. 1 caisson 1A, a front jack 3 that is locked to anchor members on both left and right sides of the front end of the first caisson 1A, and a rear jack 4 that is locked to anchor members on both left and right sides of the rear end of the first caisson 1A. The front jack 3 and the front end of the caisson adjacent to the rear are pressed into the ground by pressing the second caisson 1B and subsequent caissons to the anchor members on both left and right sides of the front end of the caisson. This method of sinking continuous caissons is characterized in that the caissons are pressed into the ground one by one using rear jacks 4 which are engaged with anchor members on both left and right sides of the caissons.

[Example] Next, the present invention will be explained in detail using illustrated examples.

When carrying out this invention and sinking continuous caissons, first, as shown in Figs. 1 and 2, a large number of caissons 1A to 1F are placed in series in the longitudinal direction (horizontal direction in Figs. 1 and 2). The lower parts of the anchor members 5A to 5G are inserted and connected to the ground 2 on both the left and right sides of the rear end of the first caisson 1A that are installed side by side on the ground and on the left and right sides of the front end of each caisson 1A to 1F. Stop.

Next, as shown in FIGS. 3 and 4, pressure girders 6 and 7 extending in the left-right direction are mounted on the upper front end and the upper rear end of the first caisson 1A, respectively, and
Front jacks 3 consisting of hydraulic center hole jacks are fitted into the anchor members 5B on both left and right sides of the front end of the caisson 1A, and the front jacks 3 are placed on the pressurizing girder 6, and the anchor members 5
A clamp 8 detachably locked to B is engaged with the upper end of the front jack 3.

Further, a rear jack 4 consisting of a hydraulic center hole jack is fitted into the anchor members 5A on both left and right sides of the rear end of the first caisson 1A, and the rear jack 4 is placed on the pressurizing girder 7, and the anchor A clamp 8 detachably locked to the member 5A is engaged with the upper end of the rear jack 4.

Next, each front jack 3 and each rear jack 4
By extending the first caisson 1A, the first caisson 1A is pressed and press-fitted into the ground 2 via the pressure girders 6 and 7. After each jack 3, 4 has been extended by a predetermined stroke, each jack 3, 4 is shortened, the clamp 8 is moved to a position where it contacts or is close to the upper end of the jack, and then each jack 3, 4 is extended again. make it work.

After repeating this operation a necessary number of times and press-fitting the first caisson 1A to a predetermined level, the pressurizing girders 6 and 7 on the upper part of the first caisson 1A, the front jack 3, and the rear jack 4 are inserted. Thoroughly eliminate.

Next, as shown in FIGS. 5 and 6, a pressure girder 6 extending in the left-right direction is mounted on the upper part of the front end of the second caisson 1B, and anchors are placed on both left and right sides of the front end of the second caisson 1B. The front jack 3 is fitted into the member 5C, and the front jack 3 is placed on the pressurizing girder 6, and the clamp 8, which is removably engaged with the anchor member 5C, is engaged with the upper end of the front jack 3. let

Further, the front part of the support member 9 that protrudes rearward from the rear end surface of the second caisson 1B is placed on the upper part of the rear end on both the left and right sides of the second caisson 1B. The pressurizing girder 7, which is fixed to the second caisson 1B and extends in the left-right direction, is mounted across the rear portions of the left and right support members 9 by means of bolts 11 screwed into inserts 10 that are embedded and fixed in the second caisson 1B. Furthermore, the rear jacks 4 are inserted into the anchor members 5B on both left and right sides of the front end of the first caisson 1A, and the rear jacks 4 are connected to the pressurizing girder 7.
At the same time, the clamp 8 detachably locked to the anchor member 5B is engaged with the upper end of the rear jack 4.

Next, each front jack 3 and each rear jack 4
By extending the second caisson 1B, the second caisson 1B is pressed and press-fitted into the ground 2 via the pressure girders 6 and 7 and the support member 9. After each jack 3, 4 has been extended by a predetermined stroke, the shortening operation of each jack 3, 4 and the relocation of the clamp 8 are repeated the necessary number of times as described above, and the second caisson 1B
Press in to the specified level.

The caissons after the third caisson 1C will be sunk one by one in the same manner as the second caisson 1B. FIG. 7 shows a state in which the third caisson 1C is press-fitted.

When implementing this invention, anchor members 5A to
As the 5G and the clamp 8, any known types may be used. Further, in order to reliably prevent the clamp 8 from slipping, a large number of projections and depressions may be provided around the rod portion of the anchor member at intervals in the longitudinal direction of the rod. , it may be composed of a large number of rods connected via threaded joints.

〔Effect of the invention〕

According to this invention, anchor members are anchored to the ground 2 on both left and right sides of the rear end of the first caisson 1A at the rear end of the casing rows installed in series in the front-rear direction and on both left and right sides of the front end of each caisson. Then, the first caisson 1A was locked to the front jack 3 which was locked to the anchor members on both the left and right sides of the front end of the first caisson, and to the anchor members on the left and right sides of the rear end of the first caisson 1A. The rear jack 4 presses it into the ground, and then the second
A front jack 3 that locks the caissons after caisson 1B to anchor members on both left and right sides of the front end of the caisson, and a rear jack 4 that locks the caissons after caisson 1B to anchor members on both left and right sides of the front end of the rearwardly adjacent caisson. Since each caisson is pressed into the ground one by one, anchor members other than those at the front and rear ends can be used for press-fitting the two front and rear caissons, and the number of anchor members installed can be significantly reduced, resulting in lower construction costs. It is possible to achieve the effect of shortening the construction period.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view showing a state in which a large number of caissons are installed side by side on the ground and anchor members are installed, Fig. 2 is a side view thereof, and Fig. 2 is a side view thereof. Figure 3 is a side view showing the first caisson being press-fitted, Figure 4 is its plan view, Figure 5 is a side view showing the second caisson being press-fitted, and Figure 6 is its plan view. , FIG. 7 is a side view showing a state in which the third caisson is press-fitted. In the figure, 1A to 1F are the caissons, 2 is the ground, 3 is the front jack, 4 is the rear jack, and 5A
~5G is an anchor member, 6 and 7 are pressurizing girders, 8
9 is a clamp, and 9 is a support member.

Claims (1)

[Claims] 1. A large number of caissons are arranged in the front-rear direction and installed on the ground, and anchor members are anchored to the ground 2 on both left and right sides of the rear end of the first caisson 1A located at the rear end and on both left and right sides of the front end of each caisson, A front jack 3 that locks the first caisson 1A to anchor members on both left and right sides of the front end of the first caisson, and a rear jack that locks the first caisson 1A to anchor members on both left and right sides of the rear end of the first caisson 1A. 4 to press it into the ground, and then press the second caisson 1B.
The subsequent caissons are held together by front jacks 3 that are locked to anchor members on both left and right sides of the front end of the caisson, and rear jacks 4 that are locked to anchor members on both left and right sides of the front end of the rearwardly adjacent caisson. A method for depositing continuous caissons, which is characterized by pressing the base one by one into the ground.