Shield receiving vertical shaft foundation pit structure of heat supply pipe network project

Abstract

The utility model discloses a shield receiving vertical shaft foundation pit structure of a heat supply pipe network project, which comprises a cast-in-situ bored pile and a high-pressure jet grouting pile which are arranged along the circumferential direction of a receiving vertical shaft foundation pit, the high-pressure jet grouting pile is positioned on the outer side of the cast-in-situ bored pile, the bottom of the cast-in-situ bored pile extends to the lower part of the bottom of the high-pressure jet grouting pile, and the bottom of the high-pressure jet grouting pile is connected with the cast-in-situ bored pile. A slope is arranged at the position, close to the cast-in-situ bored pile, of the bottom of the receiving vertical shaft foundation pit, a fine stone concrete layer is laid on the slope face of the slope, a reinforcing mesh is arranged in the fine stone concrete layer and connected with a joint bar inserted into the slope, and the joint bar is connected with the receiving vertical shaft foundation pit. A first steel pipe inclined strut, a second steel pipe inner support and a third steel pipe inner support are sequentially arranged in the receiving vertical shaft foundation pit from top to bottom. The supporting structure has the advantages that the pile bodies, the slopes and the steel supports are arranged, so that the receiving vertical shaft foundation pit can be effectively supported, and the stability of the receiving vertical shaft foundation pit is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a shield receiving shaft foundation pit structure for a heat supply pipe network project. Background Technique

[0002] Thermal pipelines are usually constructed by the shield plus casing method. The tunnel is designed with two double holes and two pipes (one for the water supply pipeline and one for the return water pipeline), and a launching shaft and a receiving shaft are respectively arranged at both ends of the shield tunnel. A foundation pit refers to the space below the ground excavated for the construction of building foundations and basements. The foundation pit is a temporary project, and its function is to provide a space for the masonry operation of the foundation to be carried out at the designated position according to the design. In order to reduce the situation of the foundation pit collapsing during the operation of the staff, a foundation pit support structure is generally introduced for use. And how to ensure the stability of the foundation pit is the key to ensuring safe construction.

[0003] Therefore, a shield receiving shaft foundation pit structure for a heat supply pipe network project that can solve the above problems is needed. Summary of the Invention

[0004] The purpose of the utility model is to provide a shield receiving shaft foundation pit structure for a heat supply pipe network project according to the deficiencies of the above-mentioned prior art. By setting piles, slopes and steel supports, the receiving shaft foundation pit can be effectively supported, thereby ensuring the stability of the receiving shaft foundation pit.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A shield receiving shaft foundation pit structure for a heat supply pipe network project includes bored cast-in-place piles and high-pressure jet grouting piles arranged along the circumferential direction of the receiving shaft foundation pit. The high-pressure jet grouting piles are located outside the bored cast-in-place piles, and the bottom of the bored cast-in-place piles extends below the bottom of the high-pressure jet grouting piles. A slope is provided at the bottom of the receiving shaft foundation pit near the bored cast-in-place piles. A fine aggregate concrete layer is paved on the slope surface of the slope, and a steel bar mesh is arranged in the fine aggregate concrete layer. The steel bar mesh is connected to the inserted bars inserted into the slope. A first steel pipe inclined support, a second steel pipe internal support and a third steel pipe internal support are sequentially arranged in the receiving shaft foundation pit from top to bottom.

[0007] The first steel pipe inclined support is connected to the capping beam, and the capping beam is connected to the bored cast-in-place piles and the high-pressure jet grouting piles. The second steel pipe internal support is connected to the bored cast-in-place piles through the waling beam. The third steel pipe internal support is connected to the bored cast-in-place piles through the waist beam, and the waist beam is arranged at the top of the slope.

[0008] The soil of the receiving shaft foundation pit from top to bottom is successively plain fill layer, medium-coarse sand layer, strongly weathered mudstone layer and moderately weathered limestone layer, and the bottoms of the bored cast-in-place piles and the high-pressure jet grouting piles are all embedded in the moderately weathered limestone layer.

[0009] The length of the bottom of the bored cast-in-place pile embedded in the moderately weathered limestone layer is not less than 3m, and the length of the bottom of the high-pressure jet grouting pile embedded in the moderately weathered limestone layer is not less than 0.5m.

[0010] The top of the slope is flush with the top surface of the moderately weathered limestone layer.

[0011] A catchment ditch, a waterproof retaining wall and a guardrail are provided on the ground around the receiving shaft foundation pit. The waterproof retaining wall is arranged on one side of the catchment ditch, and the guardrail is installed on the waterproof retaining wall.

[0012] A retaining wall is provided inside the top of the receiving shaft foundation pit.

[0013] The advantages of the present utility model are: by arranging the pile body, the slope and the steel support, the receiving shaft foundation pit can be effectively supported, thus ensuring the stability of the receiving shaft foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the shield receiving shaft foundation pit of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further details the features of the present utility model and other related features through embodiments in conjunction with the drawings for the understanding of those skilled in the same industry:

[0016] As Figure 1 shown, the marks in the figure are respectively represented as:

[0017] Bored cast-in-place pile 1, high-pressure jet grouting pile 2, slope 3, fine aggregate concrete layer 4, inserted steel bar 5, first steel pipe diagonal brace 6, second steel pipe internal support 7, third steel pipe internal support 8, capping beam 9, waling 10, waist beam 11, plain fill layer 12, medium-coarse sand layer 13, strongly weathered mudstone layer 14, moderately weathered limestone layer 15, catchment ditch 16, waterproof retaining wall 17, guardrail 18, retaining wall 19, external wall 20.

[0018] Embodiment: As Figure 1As shown in the figure, this embodiment relates to a shield receiving shaft foundation pit structure for a heat supply pipe network project, which mainly includes bored cast-in-place piles 1, high-pressure jet grouting piles 2, slopes 3, the first steel pipe inclined strut 6, the second steel pipe internal support 7, and the third steel pipe internal support 8. The soil in the receiving shaft foundation pit is successively the plain fill layer 12, medium coarse sand layer 13, strongly weathered mudstone layer 14, and moderately weathered limestone layer 15 from top to bottom. The bored cast-in-place piles 1 and high-pressure jet grouting piles 2 are both arranged along the circumference of the receiving shaft foundation pit. The high-pressure jet grouting piles 2 are located outside the bored cast-in-place piles 1, and the bottom of the bored cast-in-place piles 1 extends below the bottom of the high-pressure jet grouting piles 2. Among them, the bottoms of the bored cast-in-place piles 1 and high-pressure jet grouting piles 2 are both embedded in the moderately weathered limestone layer 15. The length of the bottom of the bored cast-in-place piles 1 embedded in the moderately weathered limestone layer 15 is not less than 3m, and the length of the bottom of the high-pressure jet grouting piles 2 embedded in the moderately weathered limestone layer 15 is not less than 0.5m, which can ensure the reliability of the bored cast-in-place piles 1 and high-pressure jet grouting piles 2.

[0019] As Figure 1 shown, a slope 3 is provided at the bottom of the receiving shaft foundation pit near the bored cast-in-place pile 1. The slope 3 can support the bottom of the bored cast-in-place pile 1. The slope surface of the slope 3 is paved with a fine stone concrete layer 4, and a steel bar mesh is provided in the fine stone concrete layer 4. The steel bar mesh is connected to the dowel bars 5 inserted into the slope 3, strengthening the overall stability of the slope 3, and the top of the slope 3 is flush with the top surface of the moderately weathered limestone layer 15.

[0020] As Figure 1 shown, the first steel pipe inclined strut 6, the second steel pipe internal support 7, and the third steel pipe internal support 8 are successively arranged in the receiving shaft foundation pit from top to bottom. The first steel pipe inclined strut 6 is connected to the capping beam 9, and the capping beam 9 is connected to the bored cast-in-place piles 1 and high-pressure jet grouting piles 2. The second steel pipe internal support 7 is connected to the bored cast-in-place pile 1 through the waling beam 10. The third steel pipe internal support 8 is connected to the bored cast-in-place pile 1 through the waist beam 11, and the waist beam 11 is arranged at the top of the slope 3. The first steel pipe inclined strut 6, the second steel pipe internal support 7, and the third steel pipe internal support 8 can support the receiving shaft foundation pit, thus ensuring the stability of the receiving shaft foundation pit.

[0021] As Figure 1 shown, a catch ditch 16, a waterproof retaining wall 17, and a guardrail 18 are provided on the ground around the receiving shaft foundation pit. The waterproof retaining wall 17 is arranged on one side of the catch ditch 16, and the guardrail 18 is installed on the waterproof retaining wall 17, which can prevent water from entering the receiving shaft foundation pit. A retaining wall 19 is provided on the inner side of the top of the receiving shaft foundation pit. The retaining wall 19 is arranged on the capping beam 9 and is used to protect the top of the receiving shaft foundation pit. In addition, a shaft is installed at the bottom of the receiving shaft foundation pit, and the outer wall 20 of the shaft is arranged near the slope 3.

[0022] The beneficial technical effects of this embodiment are as follows: By arranging the pile body, slope and steel support, the foundation pit of the receiving shaft can be effectively supported, thereby ensuring the stability of the foundation pit of the receiving shaft.

[0023] Although the above embodiments have detailed the concept and embodiments of the purpose of the present invention with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims. Therefore, they will not be elaborated one by one here.

Claims

1. A shield receiving shaft foundation pit structure for a heating pipe network project, characterized in that: It includes bored cast-in-place piles and high-pressure rotary jet piles arranged along the circumference of the receiving shaft foundation pit, the high-pressure rotary jet piles are located on the outside of the bored cast-in-place piles, the bottom of the bored cast-in-place piles extends to below the bottom of the high-pressure rotary jet piles, the bottom of the receiving shaft foundation pit is provided with a slope near the bored cast-in-place piles, the slope surface of the slope is paved with a fine stone concrete layer, a steel mesh is provided in the fine stone concrete layer, the steel mesh is connected to the inserted bars inserted in the slope, and the first steel pipe diagonal support, the second steel pipe inner support and the third steel pipe inner support are sequentially arranged in the receiving shaft foundation pit from top to bottom.

2. A shield receiving shaft foundation pit structure for a heating pipe network project as claimed in claim 1, characterized in that: The first steel pipe diagonal support is connected to the crown beam and the crown beam is connected to the bored piles and the high-pressure rotary jet piles, the second steel pipe inner support is connected to the bored piles through the surrounding purlin, and the third steel pipe inner support is connected to the bored piles through the waist beam and the waist beam is arranged at the top of the slope.

3. A shield receiving shaft foundation pit structure for a heating pipe network project as claimed in claim 2, characterized in that: The soil of the receiving shaft foundation pit is composed of a plain fill layer, a medium-coarse sand layer, a strongly weathered mudstone layer and a medium-weathered limestone layer from top to bottom, and the bottoms of the bored piles and the high-pressure jet grouting piles are embedded in the medium-weathered limestone layer.

4. A shield receiving shaft foundation pit structure for a heating pipe network project as claimed in claim 3, characterized in that: The bottom of the bored pile is embedded in the medium-weathered limestone layer for a length of not less than 3 m, and the bottom of the high-pressure jet-jet pile is embedded in the medium-weathered limestone layer for a length of not less than 0.5 m.

5. The shield receiving shaft foundation pit structure of a heating pipe network project according to claim 3, characterized in that: The top of the slope is flush with the top surface of the medium-weathered limestone layer.

6. The shield receiving shaft foundation pit structure of a heating pipe network project according to claim 1, characterized in that: A drainage ditch, a waterproof retaining wall and a guardrail are arranged on the ground around the foundation pit of the receiving shaft. The waterproof retaining wall is arranged on one side of the drainage ditch, and the guardrail is installed on the waterproof retaining wall.

7. The shield receiving shaft foundation pit structure of a heating pipe network project according to claim 1, characterized in that: A retaining wall is arranged on the inner side of the top of the foundation pit of the receiving shaft.

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