CN213038406U - TRD construction method diaphragm wall and earth-rock cofferdam combined composite temporary water retaining structure - Google Patents

Abstract

The utility model provides a temporary manger plate structure of compound that TRD worker method diaphragm wall and earth-rock cofferdam combine comprises earth-rock side cofferdam, TRD worker method diaphragm wall, stickness soil filling district. The utility model discloses an establish the earth-rock cofferdam as foundation structure, adopt inside TRD worker method diaphragm wall to be the core wall, supplementary backfill cohesive soil with the top, the bottom is looked the stratum condition and is carried out the mode formation river (lake) above the end of curtain grout and unite the manger plate system, the manger plate of solving above the end of river (lake) elevation and the prevention of seepage problem below the end of river (lake) elevation, not only improved the manger plate effect that faces the construction and execute, the degree of difficulty of demolising has been reduced simultaneously, reach the effect of saving the investment, for crossing the river, it carries out the manger plate structural design to implement to stride the operating mode that the open cut was under the surface of water elevation such as lake and provides feasible scheme. Compared with other cofferdam structure forms, the whole temporary water retaining structure has the advantages of construction period, investment and seepage prevention effect.

Description

TRD construction method diaphragm wall and earth-rock cofferdam combined composite temporary water retaining structure

Technical Field

The utility model relates to a TRD worker method continuous wall (TRD, Trench cutting Re-mixing Deep wall, equal thickness cement soil continuous stirring wall) and the interim manger plate structure thing of compound that the earth-rock cofferdam combines is applicable to if cross the river, stride the interim manger plate design field of a kind of engineering construction that adopts open cut construction below the surface of water elevation such as lake.

Background

In general, tunnel, box culvert, pipeline and comprehensive pipe gallery projects crossing rivers, lakes and the like below water surface elevations need to be provided with temporary water retaining structures at construction sections in an open-cut construction mode so as to guarantee the dry operation environment and construction safety of workers and machines in construction in foundation pits. The foundation pit seepage prevention is one of the key difficulties of the engineering, and an seepage prevention structure needs to be arranged on the cofferdam and the weir base to form a closed seepage prevention system so as to ensure the safety of the foundation pit.

Aiming at the special working condition of open cut construction below the water surface elevation, the river channel and the internal lake have the water retaining problem above the river (lake) bottom elevation and the seepage prevention problem below the river (lake) bottom elevation. The existing temporary water retaining structure comprises an earth-rock cofferdam, a concrete cofferdam, a grout stone cofferdam and a steel sheet pile cofferdam, and the existing temporary water retaining structure has application defects aiming at the working conditions. Wherein the earth-rock cofferdam can only solve the problem of water retaining at the upper part; the masonry cofferdam construction efficiency is low, the cost is higher, and a dry working environment must be created during the self construction; the underwater pouring mode of the concrete cofferdam has the advantages that the quality is not easy to guarantee, the construction cost is high, the underwater pouring mode is difficult to dismantle, the underwater pouring mode is generally used for a permanent water retaining structure, meanwhile, the concrete cofferdam generally needs to act on bedrock, and the underwater pouring mode is not suitable for the environment with more sludge, such as a river channel or a lake; the steel sheet pile cofferdam has higher requirement on the uniformity of the stratum, directly influences the verticality control of steel sheet construction when the stratum changes, has weak adaptability to broken and pebble stratums, can not be driven by the steel sheet, and has larger influence on the price of steel products by the market.

Therefore, how to design a temporary water retaining structure for construction, which can retain water above the bottom of a river (lake) and prevent seepage below the bottom elevation, is a problem to be solved urgently to ensure the construction safety under the working conditions.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a temporary water retaining structure of construction that can carry out the manger plate above the bottom of river (lake), can solve the prevention of seepage below the bottom elevation again simultaneously is provided. Therefore, the utility model adopts the following technical scheme:

a composite temporary water retaining structure combining a TRD construction method continuous wall and an earth-rock cofferdam; the construction method is characterized by comprising an earth-rock square cofferdam, a TRD construction method continuous wall and a cohesive soil filling area; the TRD construction method continuous wall is arranged on the upstream side of the earthwork cofferdam, and the lower end of the TRD construction method continuous wall is lower than the interface of the permeable layer and the impermeable layer; the cohesive soil filling area is located in the earth-rock cofferdam above the TRD construction method continuous wall, and the bottom end of the cohesive soil filling area is in lap joint with the TRD construction method continuous wall.

Compare in concrete underground continuous wall, the utility model discloses a structure requires to be lower to ground bearing capacity, and TRD worker method continuous wall bottom only needs to stretch into more than the impervious bed 0.5m on satisfying ground bearing capacity basis. Therefore, technical support is provided for rapidly removing temporary water retaining structures and reducing engineering investment in future.

Furthermore, a rock throwing and silt squeezing area or a geogrid is arranged on the contact surface of the earth-rock square cofferdam and the riverbed in the area 2m away from the TRD construction method continuous wall.

Further, the upper end of the TRD construction method continuous wall is higher than the current water level.

Further, the lap joint height of the cohesive soil filling area and the TRD construction method continuous wall is not less than 1 m.

The utility model discloses well TRD worker method diaphragm wall bottom also can increase curtain grouting construction additional strengthening's prevention of seepage ability.

The utility model discloses well TRD worker method continuous wall construction platform elevation can be adjusted according to actual conditions, but should guarantee that construction platform and operation environment satisfy the demand of worker method construction.

The utility model discloses well TRD worker method diaphragm wall top stickness soil's filling scope can be adjusted the slope ratio of opening line and fill end elevation according to the investment conditions of reality.

The utility model discloses an establish the earth-rock cofferdam as foundation structure, adopt inside TRD worker method diaphragm wall to be the core wall, supplementary backfill cohesive soil with the top, the bottom is looked the stratum condition and is carried out the mode formation river (lake) above the end of curtain grout and unite the manger plate system, the manger plate of solving above the end of river (lake) elevation and the prevention of seepage problem below the end of river (lake) elevation, not only improved the manger plate effect that faces the construction and execute, the degree of difficulty of demolising has been reduced simultaneously, reach the effect of saving the investment, for crossing the river, it carries out the manger plate structural design to implement to stride the operating mode that the open cut was under the surface of water elevation such as lake and provides feasible scheme. Compared with other cofferdam structure forms, the whole temporary water retaining structure has the advantages of construction period, investment and seepage prevention effect.

Drawings

Fig. 1 is a sectional view of the temporary composite water retaining structure combined with the diaphragm wall and the earth-rock cofferdam in the TRD construction method of the present invention.

Detailed Description

Reference is made to the accompanying drawings. The utility model provides a temporary manger plate structure thing of compound that TRD worker method diaphragm wall and earth-rock cofferdam combine comprises earth-rock square cofferdam 1, TRD worker method diaphragm wall 2, stickness soil filling district 3, TRD worker method diaphragm wall 2 disposes this one side in the partial upstream of earth-rock square cofferdam 1. The utility model discloses specific work progress as follows:

(1) before the construction of the earth-rock cofferdam, floating mud (0.5m thick) in the range of the weir base is removed to ensure that the cofferdam is contacted with the riverbed, the weir base is further stabilized by adopting a rubble-throwing and silt-squeezing mode in local areas, and the reference numeral 11 is a rubble-throwing and silt-squeezing area (0.5m thick). The integral inclination angle of the contact surface is not more than 2 degrees. In order to avoid the influence of the geogrid and the rubble extrusion on the construction of the TRD construction method continuous wall, the geogrid and the rubble extrusion are not arranged within the range of 2m on the two sides of the TRD construction method continuous wall.

(2) The earth-rock cofferdam is uniformly and symmetrically filled with earth-rock squares in a layered manner, and the joint of the earth-rock cofferdam and the bank slope is used for cleaning weeds, rock blocks, construction wastes and the like, so that a leakage channel is prevented from being formed, and the seepage-proof body of the cofferdam is ensured to be tightly connected with the bank slope. The earth-rock cofferdams are filled to the height h1 of the TRD-method continuous wall construction platform 12 in a layered mode, the height h1 is higher than the current water level by more than 0.5m, and an operation environment is provided for the TRD-method continuous wall construction. Site leveling is required to be carried out before construction of the continuous wall in the TRD method, and the construction access meets the requirements of stable walking, movement and the like of a cutting machine and a crane.

(3) A cutting machine and a crane are utilized to carry out TRD method continuous wall construction operation, the bottom of the continuous wall should extend into the impervious bed by more than 0.5m, and the reference numeral 101 is an interface of the pervious bed and the impervious bed. And curtain grouting 21 is carried out according to the condition of the bottom stratum to enhance the anti-seepage effect.

(4) The water retaining height requirement of the water retaining building is determined according to the hydraulic calculation result or data provided by design, generally not lower than the sum of the still water level and the wave height of the design flood and the safe heightening of the top of the water retaining building, wherein the height of a 3-level building is 0.7m, and the height of a 4-level building is 0.5m according to the level of the water retaining building. And calculating to obtain the top standard height h2 of the earth-rock cofferdam 1.

(5) And uniformly and symmetrically filling the TRD construction method continuous wall construction platform 12 to the calculated cofferdam top height h2 in layers. Filling cohesive soil synchronously; the cohesive soil filling area 3 is located in the earth-rock cofferdam 1 above the TRD construction method continuous wall 2, the bottom end of the cohesive soil filling area 3 is overlapped with the TRD construction method continuous wall 2, and in order to improve the seepage-proofing effect, the bottom elevation h3 of the cohesive soil filling area 3 is lower than the TRD construction method continuous wall construction platform 12 (in order to ensure that a complete and closed seepage-proofing system is formed, the overlapping height is generally not lower than 1m in engineering practice). And filling cohesive soil within the range of an opening slope ratio of 1: 0.5-1: 1 by taking the bottom elevation h3 of the cohesive soil filling area 3 as a reference elevation.

Wherein, below the elevation of the platform 12, original soil and stones are dug out at the joint of the cohesive soil backfilling area 3 and the continuous wall 2 in the TRD construction method, and then the cohesive soil is backfilled and compacted.

(6) And after the composite water retaining structure is finished, constructing necessary slope protection measures. Wherein, a drainage ditch 41 is constructed on the slope toe of the back water surface, and concrete 42 is sprayed on the slope surface by hanging a net; the slope toe of the upstream face adopts a stone presser foot 51, and the slope is firmly pressed by bagged soil or stones after being paved by geotextile 52.

The above only is the concrete embodiment of the utility model, the technical features of the utility model are not limited thereto, and any person skilled in the relevant field is in the field of the utility model, and the changes or modifications are all covered in the protection scope of the utility model.

Claims (4)

1. A TRD construction method continuous wall and earth-rock cofferdam combined composite temporary water retaining structure is characterized by comprising an earth-rock cofferdam, a TRD construction method continuous wall and a cohesive soil filling area; the TRD construction method continuous wall is arranged on the upstream side of the earthwork cofferdam, and the lower end of the TRD construction method continuous wall is lower than the interface of the permeable layer and the impermeable layer; the cohesive soil filling area is located in the earth-rock cofferdam above the TRD construction method continuous wall, and the bottom end of the cohesive soil filling area is in lap joint with the TRD construction method continuous wall.

2. The composite temporary water retaining structure combining the TRD method continuous wall and the earth-rock cofferdam as claimed in claim 1, wherein the contact surface of the earth-rock cofferdam and the river bed is provided with a rubble silt-throwing area or a geogrid in an area 2m away from the TRD method continuous wall.

3. The composite temporary water retaining structure combining the TRD-method continuous wall and the earth-rock cofferdam as recited in claim 1, wherein the upper end of the TRD-method continuous wall is higher than the current water level.

4. The composite temporary water retaining structure combining the TRD-method continuous wall and the earth-rock cofferdam as claimed in claim 1, wherein the overlapping height of the cohesive soil filling area and the TRD-method continuous wall is not less than 1 m.

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